Skocz do pozycji: 1.

Tytuł:

Remedies to Thermal Radiation in Fused Silica Optical Fibers

Autorzy:

Borzycki, Krzysztof
Jaworski, Marek
Kossek, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/2200964.pdf

Data publikacji:

2023

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

attenuation testing
fire resistant fiber optic cable
fire test
fused silica optical fiber
incandescent emission
interference filtering

Opis:

During fire incidents, optical fibers located with-in a fire-resistant cable are usually exposed to temperatures of 800◦C to 1000◦C. Hot fibers generate narrowband thermal (incandescent) radiation and collect broadband thermal radiation originating from the heated surroundings. The power of the second component, initially negligible, increases with time due to the rising number of fiber cracks and other defects acting as couplers for external radiation. Thermal radiation may interfere with fiber attenuation measurements performed during a fire test, but is rather unlikely to prevent data transmission with typical GbE and 10 GbE transceivers during a fire. This problem may be remedied by combining the following methods: using single mode fibers instead of multimode fibers, using bandpass filters to block thermal radiation, and selecting proper transmitter power, wavelength and photodetector.

Źródło:

Journal of Telecommunications and Information Technology; 2023, 1; 88--96
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Considerations on modifying basalt fabrics protecting against the thermal radiation

Autorzy:

Miśkiewicz, Pamela
Frydrych, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/1179530.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

basalt fabrics
basalt fibers
chemical vapour deposition
physical vapour deposition
protective gloves

Opis:

Due to very good thermal and mechanical properties characterizing basalt fibers and items made of them, this raw material is now more frequently used for the manufacturing various textile products. Basalt fibers on the textile market are primarily used in articles, which are designed to protect against thermal factors. The paper discusses the possibility of applying selected coatings formed by physical – PVD (Physical Vapour Deposition) or chemical CVD (Chemical Vapour Deposition) deposition of chemical compounds in the form of gaseous phase on the surface of basalt fabrics to improve their protective properties against very high temperatures affecting the clothing products.

Źródło:

World Scientific News; 2017, 76; 85-90
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Micropolar flow over a black isothermal plate in the presence thermal radiation

Autorzy:

Raptis, A.

Powiązania:

https://bibliotekanauki.pl/articles/1839844.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

płyn mikropolarny
promieniowanie cieplne
płyta izotermiczna
micropolar fluid
thermal radiation
isothermal plate

Opis:

This study numerically investigates the effects of thermal radiation on the flow over a black isothermal plate for an optically thin gray micropolar fluid. The flowing medium absorbs and emits radiation, but scattering is not included. The computational results are discussed graphically for several selected flow parameters.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 235-241
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Effect of thermal radiation, chemical reaction and viscous dissipation on MHD flow

Autorzy:

Zigta, B.

Powiązania:

https://bibliotekanauki.pl/articles/265728.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

przepływ MHD
promieniowanie cieplne
reakcja chemiczna
MHD flow
thermal radiation
chemical reaction
viscous dissipation

Opis:

This study examines the effect of thermal radiation, chemical reaction and viscous dissipation on a magnetohydro- dynamic flow in between a pair of infinite vertical Couette channel walls. The momentum equation accounts the effects of both the thermal and the concentration buoyancy forces of the flow. The energy equation addresses the effects of the thermal radiation and viscous dissipation of the flow. Also, the concentration equation includes the effects of molecular diffusivity and chemical reaction parameters. The gray colored fluid considered in this study is a non-scattering medium and has the property of absorbing and emitting radiation. The Roseland approximation is used to describe the radiative heat flux in the energy equation. The velocity of flow transforms kinetic energy into heat energy. The increment of the velocity due to internal energy results in heating up of the fluid and consequently it causes increment of the thermal buoyancy force. The Eckert number being the ratio of the kinetic energy of the flow to the temperature difference of the channel walls is directly proportional to the thermal energy dissipation. It can be observed that increasing the Eckert number results in increasing velocity. A uniform magnetic field is applied perpendicular to the channel walls. The temperature of the moving wall is high enough due to the presence of thermal radiation. The solution of the governing equations is obtained using regular perturbation techniques. These techniques help to convert partial differential equations to a set of ordinary differential equations in dimensionless form and thus they are solved analytically. The following results are obtained: from the simulation study it is observed that the flow pattern of the fluid is affected due to the influence of the thermal radiation, the chemical reaction and viscous dissipation. The increment in the Hartmann number results in the increment of the Lorentz force but a decrement in velocity of the flow. An increment in the radiative parameter results in a decrement in temperature. An increment in the Prandtl number results in a decrement in thermal diffusivity. An increment in both the chemical reaction parameter and molecular diffusivity results in a decrement in concentration.

Źródło:

International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 787-801
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Sensitivity and dynamic phase response to thermal radiation of a polarization-maintaining fiber

Autorzy:

Kyselak, M.
Dvorak, F.
Maschke, J.
Vlcek, C.

Powiązania:

https://bibliotekanauki.pl/articles/173541.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fiber sensor
polarization-maintaining fiber
PMF
optical fiber
birefringence
temperature field disturbance
approximation equations
approximation parameters

Opis:

This paper deals with the phase shift development between two polarization modes in birefringent fiber, caused by body heat transfer of different temperatures. The aim is to analyze sensitivity and dynamic behaviors, which are significant when optical fiber is used as a sensor of temperature field disturbance. The analysis is based on the values measured during thermal exposure of a section of type PANDA birefringent optical fiber to heat emitted by an exposure body of chosen temperature, placed at a defined distance. The effect of heat transfer through conduction and convection is suppressed by shielding with plastic wraps. The analyzed results, the Stokes parameters and subsequent phase shift, are measured by the polarimeter. The paper follows up on previously published measurement results.

Źródło:

Optica Applicata; 2018, 48, 2; 249-261
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Destruction of Moulding Sands with Chemical Binders Caused by the Thermal Radiation of Liquid Metal

Autorzy:

Zych, J.
Mocek, J.

Powiązania:

https://bibliotekanauki.pl/articles/382547.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sand mould
thermal destruction
thermal radiation
heating of mould
loss of strength
masa formierska
rozkład termiczny
promieniowanie cieplne

Opis:

The obtained results of heating of sand moulds with binders by means of a thermal radiation of liquid metal are presented in this study. Standard samples for measuring R_g made of the tested moulding sands were suspended at the lower part of the cover which was covering the crucible with liquid metal (cast iron), placed in the induction furnace. The authors own methodology was applied in investigations. The progressing of the samples surface layers heating process was determined as the heating time function. Samples of a few kinds of moulding sands with chemical binders were tested. Samples without protective coatings as well as samples with such coatings were tested. The influence of the thermal radiation on bending resistance of samples after their cooling was estimated. The influence of several parameters such as: time of heating, distance from the metal surface, metal temperature, application of coatings, were tested. A very fast loss of strength of moulding sands with organic binders was found, especially in cases when the distance between metal and sample surfaces was small and equaled to 10÷15 mm. Then, already after app. 15 seconds of the radiation (at T_met=1400°C), the resistance decreases by nearly 70%. Generally, moulding sands with organic binders are losing their strength very fast, while moulding sands with water glass at first increase their strength and later slightly lose. The deposition of protective coatings increases the strength of the mould surface layers, however does not allow to retain this strength after the metal thermal radiation.

Źródło:

Archives of Foundry Engineering; 2015, 15, 4; 95-100
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Absorption characteristics of thermal radiation for carbon dioxide
Charakterystyka absorpcji promieniowania cieplnego dla dwutlenku węgla

Autorzy:

Kubicki, Jan
Kopczyński, Krzysztof
Młyńczak, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/2174709.pdf

Data publikacji:

2022

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

absorption characteristics
saturation of absorption
thermal radiation
Schwarzschild equation
charakterystyka absorbcji
nasycenie absorbcji
promieniowanie cieplne
równanie Schwarzschilda

Opis:

The article presents graphs of absorption of thermal radiation as a function of the mass of absorbing carbon dioxide per unit of illuminated area. Experimental research was preceded by an analysis of a simplified model of radiation absorption, paying attention to the phenomenon of saturation. The results of the experimental research were compared with the theoretical ones and the discrepancies were interpreted. Based on the conclusions, suggestions were made regarding the impact of further CO2 emissions on climate change.
W artykule przedstawiono wykresy absorpcji promieniowania cieplnego w funkcji masy absorbującego dwutlenku węgla na jednostkę oświetlanej powierzchni. Badania eksperymentalne poprzedzono analizą uproszczonego modelu absorpcji promieniowania, zwracając uwagę na zjawisko nasycenia. Wyniki badań eksperymentalnych porównano z teoretycznymi, a rozbieżności zinterpretowano. Na podstawie wniosków sformułowano sugestie dotyczące wpływu dalszej emisji CO2 na zmiany klimatyczne.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2022, 12, 3; 4--7
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Heat Gain From Thermal Radiation Through Protective Clothing With Different Insulation, Reflectivity and Vapour Permeability

Autorzy:

Brode, P.
Kuklane, K.
Candas, V.
Den Hartog, E. A.
Griefahn, B.
Holmer, I.
Meinander, H.
Nocker, W.
Richards, M.
Havenith, G.

Powiązania:

https://bibliotekanauki.pl/articles/90351.pdf

Data publikacji:

2010

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

protective clothing
heat stress
heat budget models
thermal manikin

Opis:

The heat transferred through protective clothing under long wave radiation compared to a reference condition without radiant stress was determined in thermal manikin experiments. The influence of clothing insulation and reflectivity, and the interaction with wind and wet underclothing were considered. Garments with different outer materials and colours and additionally an aluminised reflective suit were combined with different number and types of dry and pre-wetted underwear layers. Under radiant stress, whole body heat loss decreased, i.e., heat gain occurred compared to the reference. This heat gain increased with radiation intensity, and decreased with air velocity and clothing insulation. Except for the reflective outer layer that showed only minimal heat gain over the whole range of radiation intensities, the influence of the outer garments’ material and colour was small with dry clothing. Wetting the underclothing for simulating sweat accumulation, however, caused differing effects with higher heat gain in less permeable garments.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2010, 16, 2; 231-244
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

MHD and thermal radiation effects on exponentially accelerated isothermal vertical plate with uniform mass diffusion

Autorzy:

Muthucumaraswamy, R.
Visalakshi, V.

Powiązania:

https://bibliotekanauki.pl/articles/265445.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie
izotermiczność
płyta pionowa
dyfuzja masy
pole magnetyczne
radiation
isothermal
vertical plate
mass diffusion
magnetic field

Opis:

Thermal radiation effects on an unsteady free convective flow of a viscous incompressible flow of a past an exponentially accelerated infinite isothermal vertical plate with uniform mass diffusion in the presence magnetic field are considered. The fluid considered here is a gray, absorbing-emitting radiation but a non-scattering medium. The plate temperature is raised to Tw and the concentration level near the plate is also raised to Cʹw . An exact solution to the dimensionless governing equations is obtained by the Laplace transform method, when the plate is exponentially accelerated with a velocity u= u0 exp(aʹtʹ) in its own plane against gravitational field. The effects of velocity, temperature and concentration fields are studied for different physical parameters such as the magnetic field parameter, thermal radiation parameter, Schmidt number, thermal Grashof number, mass Grashof number and time. It is observed that the velocity increases with decreasing magnetic field parameter or radiation parameter. But the trend is just reversed with respect to a or t .

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 599-608
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Hydromagnetic rarefied fluid flow over a wedge in the presence of surface slip and thermal radiation

Autorzy:

Das, K.
Sharma, R. P.
Duari, P. R.

Powiązania:

https://bibliotekanauki.pl/articles/264410.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

convective flow
heat transfer
surface slip
magnetic field
thermal radiation
przepływ konwekcyjny
przenoszenie ciepła
pole magnetyczne
promieniowanie cieplne

Opis:

An analysis is presented to investigate the effects of thermal radiation on a convective slip flow of an electrically conducting slightly rarefied fluid, having temperature dependent fluid properties, over a wedge with a thermal jump at the surface of the boundary in the presence of a transverse magnetic field. The reduced equations are solved numerically using the finite difference code that implements the 3-stage Lobatto IIIa formula for the partitioned Runge-Kutta method. Numerical results for the dimensionless velocity and temperature as well as for the skin friction coefficient and the Nusselt number are presented through graphs and tables for pertinent parameters to show interesting aspects of the solution.

Źródło:

International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 827-837
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Combined effects of thermal radiation and Hall current on MHD Casson nanofluid exerted by peristaltic transport

Autorzy:

Asha, S. K.
Hadapad, Chandrashekhar

Powiązania:

https://bibliotekanauki.pl/articles/1193365.pdf

Data publikacji:

2021

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Hall current
MHD
nanofluid
peristaltic transport
thermal radiation

Opis:

The present work intends to analyse the MHD Casson nano fluid inside an asymmetric channel. The equations governing the fluid flow admit both Thermophoresis and Brownian motion alongside thermal radiation. We acquired closed form analytical solutions for temperature, axial velocity, nanoparticle concentration and pressure gradient profiles. The ascendency of governing parameters like thermal radiation parameter, thermophoresis, Brownian, Hartmann number and Hall parameter on dimensionless temperature, concentration and pressure gradient profiles have been explained in detailed manner with the aid of plots and table. The prevailed results in this article are verified with prior available literature for specific cases and they are in good agreement.

Źródło:

World Scientific News; 2021, 155; 1-22
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Effect of thermal radiation and chemical reaction on MHD flow of blood in stretching permeable vessel

Autorzy:

Zigta, B.

Powiązania:

https://bibliotekanauki.pl/articles/1839798.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

rozciąganie
pole magnetyczne
promieniowanie cieplne
reakcja chemiczna
stretching velocity
similarity transformations
time dependent magnetic field intensity
thermal radiation
chemical reaction

Opis:

This paper focuses on the theoretical analysis of blood flow in the presence of thermal radiation and chemical reaction under the influence of time dependent magnetic field intensity. Unsteady non linear partial differential equations of blood flow consider time dependent stretching velocity, the energy equation also accounts time dependent temperature of vessel wall and the concentration equation includes the time dependent blood concentration. The governing non linear partial differential equations of motion, energy and concentration are converted into ordinary differential equations using similarity transformations solved numerically by applying ode45. The effect of physical parameters, viz., the permeability parameter, unsteadiness parameter, Prandtl number, Hartmann number, thermal radiation parameter, chemical reaction parameter and Schmidt number on flow variables, viz., velocity of blood flow in vessel, temperature and concentration of blood, has been analyzed and discussed graphically. From the simulation study the following important results are obtained: velocity of blood flow increases with the increment of both permeability and unsteadiness parameter. The temperature of blood increases at the vessel wall as the Prandtl number and Hartmann number increase. Concentration of blood decreases as time dependent chemical reaction parameter and Schmidt number increases.

Źródło:

International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 198-211
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

MHD slip flow past an extending surface with third type boundary condition and thermal radiation effects

Autorzy:

Gururaj, A. D. M.
Dhanasekaran, S.
Parthiban, V.

Powiązania:

https://bibliotekanauki.pl/articles/265680.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie cieplne
magnetohydrodynamika
warunki graniczne
third type boundary condition
slip flow
thermal radiation
extending surface

Opis:

MHD slip flow past an extending surface with third type (convective) boundary condition and thermal radiation is analysed. The governing momentum and energy equations are converted into set of nonlinear ordinary differential equations using appropriate similarity transformations. The Fourth-Order Runge-Kutta shooting method is applied for obtaining the numerical solution of the resulting nonlinear ordinary differentia equations. The numerical results for velocity and temperature distribution are found for different values of the vital parameters, namely: the magnetic interaction factor, slip factor, convective factor, Prandtl number and radiation factor and are presented graphically, and discussed.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 577-590
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Thermal radiation, chemical reaction, viscous and joule dissipation effects on MHD flow embedded in a porous medium

Autorzy:

Zigta, B.

Powiązania:

https://bibliotekanauki.pl/articles/264380.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie cieplne
reakcja chemiczna
porowatość
thermal radiation
chemical reaction
Joule dissipation
viscous dissipation
porous medium

Opis:

An analysis is presented to study the effects of thermal radiation, chemical reaction, viscous and Joule dissipation on MHD free convection flow between a pair of infinite vertical Couette channel walls embedded in a porous medium. The fluid flows by a strong transverse magnetic field imposed perpendicularly to the channel wall on the assumption of a small magnetic Reynolds number. The governing non linear partial differentia equations are transformed in to ordinary differential equations and are solved analytically. The effect of various parameters viz., Eckert number, electric conductivity, dynamic viscosity and strength of magnetic field on temperature profile has been discussed and presented graphically.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 725-737
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Conjugate heat and mass transfer on fluctuating mixed convection flow along a vertical wedge with thermal radiation

Autorzy:

Firoza, M. N.
Roy, N. C.
Hossain, A.

Powiązania:

https://bibliotekanauki.pl/articles/264573.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

mixed convection
thermal radiation
vertical wedge
promieniowanie cieplne
przepływ ciepła
niska częstotliwość

Opis:

We study the boundary layer characteristics of heat and mass transfer flow past a vertical wedge in the presence of thermal radiation. The surface temperature and the species concentration are assumed to be oscillating in the magnitude but not in the direction of oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the straightforward finite difference method for the entire frequency range, and the series solution for the low frequency range and the asymptotic series expansion method for the high frequency range. Numerical solutions have been presented in terms of the amplitudes and phase angles of the skin friction, the rate of heat transfer and the mass transfer with the variations of Richardson’s number, the Prandtl number, the conduction–radiation parameter, the surface temperature parameter and the Schmidt number. Furthermore, the effects of these parameters are examined in terms of the transient skin friction, heat transfer and mass transfer.

Źródło:

International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 539-565
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Triple diffusive flow of Casson nanofluid with buoyancy forces and nonlinear thermal radiation over a horizontal plate

Autorzy:

Archana, Manjappa
Gireesha, Bijjanal Jayanna
Prasannakumara, Ballajja Chandrappa

Powiązania:

https://bibliotekanauki.pl/articles/240608.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

triple diffusion
casson nanofluid
nonlinear thermal radiation
buoyancy force
siła wyporu
promieniowanie cieplne

Opis:

The presence of more than one solute diffused in fluid mixtures is very often requested for discussing the natural phenomena such as transportation of contaminants, underground water, acid rain and so on. In the paper, the effect of nonlinear thermal radiation on triple diffusive convective boundary layer flow of Casson nanofluid along a horizontal plate is theoretically investigated. Similarity transformations are utilized to reduce the governing partial differential equations into a set of nonlinear ordinary differential equations. The reduced equations are numerically solved using Runge-Kutta-Fehlberg fourth-fifth order method along with shooting technique. The impact of several existing physical parameters on velocity, temperature, solutal and nanofluid concentration profiles are analyzed through graphs and tables in detail. It is found that, modified Dufour parameter and Dufour solutal Lewis number enhances the temperature and solutal concentration profiles respectively.

Źródło:

Archives of Thermodynamics; 2019, 40, 1; 49-69
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Unsteady MHD plane couette-poiseuille flow of fourthgrade fluid with thermal radiation, chemical reaction and suction effects

Autorzy:

Joseph, K. M.
Ayankop-Andi, E.
Mohammed, S. U.

Powiązania:

https://bibliotekanauki.pl/articles/2106460.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie cieplne
magnetohydrodynamika
ssanie
thermal radiation
MHD
chemical reaction
fourth-grade fluid
suction
He-Laplace

Opis:

This study investigates the unsteady MHD flow of a fourth-grade fluid in a horizontal parallel plates channel. The upper plate is oscillating and moving while the bottom plate is stationary. Solutions for momentum, energy and concentration equations are obtained by the He-Laplace scheme. This method was also used by Idowu and Sani [12] and there is agreement with our results. The effect of various flow parameters controlling the physical situation is discussed with the aid of graphs. Significant results from this study show that velocity and temperature fields increase with the increase in the thermal radiation parameter, while velocity and concentric fields decrease with an increase in the chemical reaction parameter. Furthermore, velocity, temperature and concentric fields decrease with an increase in the suction parameter. It is also interesting to note that when 4S0=, our results will be in complete agreement with Idowu and Sani [12] results. The results of this work are applicable to industrial processes such as polymer extrusion of dye, draining of plastic films etc.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 77--98
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Effect of convective heat and mass conditions in magnetohydrodynamic boundary layer flow with joule heating and thermal radiation

Autorzy:

Sharma, R. P.
Tinker, Seema
Gireesha, B. J.
Nagaraja, B.

Powiązania:

https://bibliotekanauki.pl/articles/1839793.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

konwekcja
magnetohydrodynamika
reakcja chemiczna
promieniowanie cieplne
convection
MHD
Joule heating
chemical reaction
thermal radiation

Opis:

A free convection viscous MHD flow over a semi-infinite vertical sheet with convective heat and mass conditions has been considered. The effects of thermal radiation, chemical reaction and Joule heating on flow are also accounted. The governing nonlinear partial differential equations have been transformed into a set of highly non-linear coupled ordinary differential equations (ODEs) using appropriate similarity transformations. Numerical solutions of transformed equations are obtained by employing the 5th order Runge-Kutta Fehlberg technique followed by the shooting technique. The influences of different flow parameters on the momentum, energy and mass field are discussed and shown graphically. Results reveal that temperature and concentration profiles enhance due to increasing heat and mass Biot number parameters.

Źródło:

International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 103-116
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Mixed convection in the stagnation-point flow over a vertical stretching sheet in the presence of thermal radiation

Autorzy:

Manjunatha, S.
Gireesha, B. J.
Bagewadi, C. S.

Powiązania:

https://bibliotekanauki.pl/articles/265508.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

boundary layer flow
stretching porous surface
mixed convective parameter
thermal radiation
numerical solution
dusty fluid
free stream velocity
przepływ warstwowy
powierzchnia porowata
promieniowanie cieplne

Opis:

An unsteady two-dimensional stagnation-point mixed convection flow of a viscous, incompressible dusty fluid towards a vertical stretching sheet has been examined. The stretching velocity and the free stream velocity are assumed to vary linearly with the distance from the stagnation point. The problem is analyzed using similarity solutions. The similarity ordinary differential equations were then solved numerical by using the RKF-45 method. The effects of various physical parameters on the velocity profile and skin-friction coefficient are also discussed in this paper. Some important findings reported in this work reveal that the effect of radiation has a significant impact on controlling the rate of heat transfer in the boundary layer region.

Źródło:

International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 871-888
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Mixed convection on MHD flow with thermal radiation, chemical reaction and viscous dissipation embedded in a porous medium

Autorzy:

Zigta, B.

Powiązania:

https://bibliotekanauki.pl/articles/264811.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

konwekcja mieszana
prędkość ssania
promieniowanie cieplne
reakcja chemiczna
lepkość
mixed convection
suction velocity
thermal radiation
chemical reaction
viscous dissipation

Opis:

In this paper, a theoretical analysis has been made to study the effect of mixed convection MHD oscillatory Couette flow in a vertical parallel channel walls embedded in a porous medium in the presence of thermal radiation, chemical reaction and viscous dissipation. The channel walls are subjected to a constant suction velocity and free stream velocity is oscillating with time. The channel walls are embedded vertically in a porous medium. A magnetic field of uniform strength is applied normal to the vertical channel walls. The nonlinear and coupled partial differential equations are solved using multi parameter perturbation techniques. The effects of physical parameters, viz., the radiation absorption parameter, Prandtl number, Eckert number, dynamic viscosity, kinematic viscosity, permeability of porous medium, suction velocity, Schmidt number and chemical reaction parameter on flow variables viz., temperature, concentration and velocity profile have been studied. MATLAB code is used to analyze theoretical facts. The important results show that an increment in the radiation absorption parameter and permeability of porous medium results in an increment of the temperature profile. Moreover, an increment in the Prandtl number, Eckert number and dynamic viscosity results in a decrement of the temperature profile. An increment in suction velocity results in a decrement of the velocity profile. An increment in the Schmidt number, chemical reaction parameter and kinematic viscosity results in a decrement of the concentration profile.

Źródło:

International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 219-235
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

A numerical examination of an unsteady nonlinear MHD flow in the presence of thermal radiation and heat generation

Autorzy:

Agbaje, T. M.
Leach, P. G. L.

Powiązania:

https://bibliotekanauki.pl/articles/1839890.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

przepływ MHD
promieniowanie cieplne
wytwarzanie ciepła
unsteady MHD flow
spectral perturbation method
spectral relaxation method
thermal radiation
heat generation

Opis:

In this study, the spectral perturbation method and the spectral relaxation method are used to solve the nonlinear differential equations of an unsteady nonlinear MHD flow in the presence of thermal radiation and heat generation. The SPM is mainly based on series expansion, generating series approximation coupled with the Chebyshev spectral method. The numerical results generated using the spectral perturbation method were compared with those found in the literature, and the two results were in good agreement.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 1-17
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Mixed convective fully developed flow in a vertical channel in the presence of thermal radiation and viscous dissipation

Autorzy:

Prasad, K. V.
Mallikarjun, P.
Vaidya, H.

Powiązania:

https://bibliotekanauki.pl/articles/265697.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

mixed convection
thermal radiation
viscous dissipation
Differential Transform Method (DTM)
Perturbation Method (PM)
konwekcja mieszana
promieniowanie cieplne
metoda transformacji różnicowej
metoda zakłóceń

Opis:

The effect of thermal radiation and viscous dissipation on a combined free and forced convective flow in a vertical channel is investigated for a fully developed flow regime. Boussinesq and Roseseland approximations are considered in the modeling of the conduction radiation heat transfer with thermal boundary conditions (isothermal-thermal, isoflux-thermal, and isothermal-flux). The coupled nonlinear governing equations are also solved analytically using the Differential Transform Method (DTM) and regular perturbation method (PM). The results are analyzed graphically for various governing parameters such as the mixed convection parameter, radiation parameter, Brinkman number and perturbation parameter for equal and different wall temperatures. It is found that the viscous dissipation enhances the flow reversal in the case of a downward flow while it counters the flow in the case of an upward flow. A comparison of the Differential Transform Method (DTM) and regular perturbation method (PM) methods shows the versatility of the Differential Transform Method (DTM). The skin friction and the wall temperature gradient are presented for different values of the physical parameters and the salient features are analyzed.

Źródło:

International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 123-144
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Thermal radiation and chemical reaction effects on unsteady magnetohydrodynamic third grade fluid flow between stationary and oscillating plates

Autorzy:

Idowu, A. S.
Sani, U.

Powiązania:

https://bibliotekanauki.pl/articles/265001.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

przepływ Couette'a
przepływ magnetohydrodynamiczny
promieniowanie cieplne
reakcja chemiczna
third grade fluid
plane Couette
Couette-Poiseuille flow
magnetohydrodynamic flow
stationary and oscillating plate
thermal radiation
chemical reaction

Opis:

An analysis was carried out for an unsteady magnetohydrodynamic (MHD) flow of a generalized third grade fluid between two parallel plates. The fluid flow is a result of the plate oscillating, moving and pressure gradient. Three flow problems were investigated, namely: Couette, Poiseuille and Couette-Poiseuille flows and a number of nonlinear partial differential equations were obtained which were solved using the He-Laplace method. Expressions for the velocity field, temperature and concentration fields were given for each case and finally, effects of physical parameters on the fluid motion, temperature and concentration were plotted and discussed. It is found that an increase in the thermal radiation parameter increases the temperature of the fluid and hence reduces the viscosity of the fluid while the concentration of the fluid reduces as the chemical reaction parameter increases.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 269-293
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Mass transfer with chemical reaction on flow past an accelerated vertical plate with variable temperature and thermal radiation

Autorzy:

Muthucumaraswamy, R.
Balachandran, P.
Ganesan, K.

Powiązania:

https://bibliotekanauki.pl/articles/264786.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

reakcja chemiczna
promieniowanie
wymiana ciepła i masy
linearly accelerated
chemical reaction
radiation
heat and mass transfer

Opis:

An exact solution of an unsteady radiative flow past a uniformly accelerated infinite vertical plate with variable temperature and mass diffusion is presented here, taking into account the homogeneous chemical reaction of first order. The plate temperature as well as concentration near the plate is raised linearly with time. The dimensionless governing equations are solved using the Laplace-transform technique. The velocity, temperature and concentration fields are studied for different physical parameters such as the thermal Grashof number, mass Grashof number, Schmidt number, Prandtl number, radiation parameter, chemical reaction parameter and time. It is observed that the velocity increases with increasing values of the thermal Grashof number or mass Grashof number. But the trend is just reversed with respect to the thermal radiation parameter. It is also observed that the velocity increases with the decreasing chemical reaction parameter.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 945-953
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Effect of viscous dissipation and thermal radiation on heat transfer over a non-linearly stretching sheet through porous medium

Autorzy:

Nandeppanavar, M. M.
Siddalingappa, M. N.

Powiązania:

https://bibliotekanauki.pl/articles/264505.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

materiały porowate
metoda Runge-Kutty
promieniowanie cieplne
porous media
viscous dissipation
Runge-Kutta method
thermal radiation
wall temperature gradient
wall temperature

Opis:

In this present paper, we have discussed the effects of viscous dissipation and thermal radiation on heat transfer over a non-linear stretching sheet through a porous medium. Usual similarity transformations are considered to convert the non-linear partial differential equation of motion and heat transfer into ODE’s. Solutions of motion and heat transfer are obtained by the Runge-Kutta integration scheme with most efficient shooting technique. The graphical results are presented to interpret various physical parameters of interest. It is found that the velocity profile decreases with an increase of the porous parameter asymptotically. The temperature field decreases with an increase in the parametric values of the Prandtl number and thermal radiation while with an increase in parameters of the Eckert number and porous parameter, the temperature field increases in both PST (power law surface temperature) and PHF (power law heat flux) cases. The numerical values of the non-dimensional wall temperature gradient and wall temperature are tabulated and discussed.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 461-474
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Influence of thermal radiation on magnetohydrodynamic (MHD) boundary layer flow of a viscous fluid over an exponentially stretching sheet

Autorzy:

Idowu, A. S.
Usman, S.

Powiązania:

https://bibliotekanauki.pl/articles/266291.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

warstwa graniczna
przenikania ciepła
promieniowanie
magnetohydrodynamika
boundary layer
heat transfer
MHD
radiation
stretching sheet

Opis:

Radiation on a magnetohydrodynamic (MHD) boundary layer flow of a viscous fluid over an exponentially stretching sheet was considered together with its effects. The new technique of homotopy analysis method (nHAM) was used to obtain the convergent series expressions for velocity and temperature, where the governig system of partial differential equations was transformed into ordinary differential equations. The interpretation of these expressions is shown physically through graphs. We observed that the effects of the Prandtl and magnetic number act in opposite to each other on the temperature.

Źródło:

International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 581-592
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Thermal Microwave Radiation for Subsurface Absolute Temperature Measurement

Autorzy:

Susek, W.

Powiązania:

https://bibliotekanauki.pl/articles/1506860.pdf

Data publikacji:

2010-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.63.Hg
44.40.+a
84.40.Dc
07.57.Hm

Opis:

Problems related to thermal radiation of human bodies in the microwave range are presented in the paper from medical diagnosis point of view. The paper reviews physical principles of thermal radiation measurement at microwave frequencies. A design of a modulation type radiometer with both zero reading and compensation of influence of the reflectivity is presented in the paper. On the base of this design, requirements for absolute temperature measurement conditions in the lossy and homogeneous medium were found. It is worth noting that these demands do not need any limitations for environmental parameters, especially for their stability during measurement (ambient temperature stability). At the end, experimental results of the measurements carried out with the use of the microwave radiometer operating in the 1.5 GHz band are shown.

Źródło:

Acta Physica Polonica A; 2010, 118, 6; 1246-1249
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Zastosowanie kamery termowizyjnej LW w pomiarze cieplnego promieniowania nieboskłonu
Use of LW infrared camera for measurement of sky thermal radiation

Autorzy:

Kruczek, T.

Powiązania:

https://bibliotekanauki.pl/articles/151610.pdf

Data publikacji:

2013

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

pomiary termowizyjne
promieniowanie cieplne nieboskłonu
radiacyjna temperatura nieboskłonu
badania termowizyjne rurociągów napowietrznych
thermovision infrared measurements
sky thermal radiation
sky radiative temperature
thermovision inspection of overhead pipelines

Opis:

Znajomość cieplnej emisji nieboskłonu jest niezbędna w obliczeniach radiacyjnej wymiany ciepła pomiędzy obiektami w otwartej przestrzeni i otoczeniem. Praca dotyczy zastosowania wyniku pomiaru temperatury nieboskłonu za pomocą kamery termowizyjnej do określenia gęstości cieplnego promieniowania nieboskłonu. Temperatura nieboskłonu jest temperaturą pozorną, wynikającą z intensywności jego promieniowania. Artykuł dotyczy problemu pomiaru tej temperatury i zawiera propozycję jego rozwiązania.
The work deals with measurement of the apparent temperature of the sky with use of a long-wave (LW) infrared camera and determination of the sky thermal radiation intensity. Convective and radiative heat transfer takes place between a heat pipeline and the surrounding on the external pipeline shell. In the case of a low temperature of the sky, the radiation heat exchange is very intensive and the temperature of the top part of the horizontal pipeline is much lower than the bottom part and can drop below the atmospheric air temperature. The aforementioned phenomenon causes difficulties during evaluation of the quality of the pipeline thermal insulation and determination of the pipeline heat losses. The occurrence of this phenomenon strongly depends on the intensity of thermal radiation of the sky. The paper contains a description of the method for determination of the sky thermal radiation intensity on the basis of sky temperature measurement with the use of an LW infrared camera. To verify the developed method, the results obtained with the use of the LW infrared camera and measurement results obtained by means of a pyrgeometer were compared. The result of this comparison is quite satisfactory.

Źródło:

Pomiary Automatyka Kontrola; 2013, R. 59, nr 9, 9; 905-908
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

First order chemical reaction effects on exponentially accelerated vertical plate with variable mass diffusion in the presence of thermal radiation

Autorzy:

Muthucumaraswamy, R.
Lakshmi, C. S.

Powiązania:

https://bibliotekanauki.pl/articles/264881.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

exponential
radiation
isothermal
vertical plate
heat and mass transfer
promieniowanie
izoterma
wymiana ciepła
wymiana masy

Opis:

Effects of transfer of mass and free convection on the flow field of an incompressible viscous fluid past an exponentially accelerated vertical plate with variable surface temperature and mass diffusion are studied. Results for velocity, concentration, temperature are obtained by solving governing equations using the Laplace transform technique. It is observed that the velocity increases with decreasing values of the chemical reaction parameter or radiation parameter. But the trend is just reversed with respect to the time parameter. The skin friction is also studied.

Źródło:

International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 329-344
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Saturation of the absorption of thermal radiation by atmospheric carbon dioxide
Nasycenie procesu absorpcji promieniowania termicznego w atmosferycznym dwutlenku węgla

Autorzy:

Kubicki, Jan
Kopczyński, Krzysztof
Młyńczak, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/408638.pdf

Data publikacji:

2020

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

greenhouse gas
radiation process
Schwarzschild equation
climate sensitivity
gaz cieplarniany
proces radiacyjny
równanie Schwarzschilda
wrażliwość klimatyczna

Opis:

The article presents a concise review of the works concerning the impact of an increase ofthe concentration of carbon dioxide in the atmosphere on the increase ofits absorption of thermal radiation. Attention was paid to differences in the results of calculations presented in the works byvarious authors. Experimentalverification was carried out, which confirmed the possibility of saturation of the process of thermal radiation absorption byCO2in the atmosphere. Possibilities of improving climate models by using direct measurement results ofexperimental works were pointed out.
W artykule przedstawiono zwięzły przegląd prac dotyczących wpływu wzrostu stężenia dwutlenku węgla w atmosferze na wzrost w niej absorpcji promieniowania termicznego. Zwrócono uwagę na różnice wyników obliczeń w pracach różnych autorów. Przeprowadzono weryfikację eksperymentalną, która potwierdziła możliwość nasycenia się procesuabsorpcji promieniowania termicznego dla CO2w atmosferze. Wskazano możliwości doskonalenia modeli klimatycznych poprzez wykorzystywanie bezpośrednich wyników pomiarów w pracach eksperymentalnych.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 1; 77-81
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

MHD flow past a parabolic flow past an infinite isothermal vertical plate in the presence of thermal radiation and chemical reaction

Autorzy:

Muthucumaraswamy, R.
Sivakumar, P.

Powiązania:

https://bibliotekanauki.pl/articles/265859.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

MHD
płyta pionowa
promieniowanie cieplne
metoda transformacji Laplace'a
isothermal
radiation
vertical plate
thermal radiation
chemical reaction
Laplace transforms technique

Opis:

The problem of MHD free convection flow with a parabolic starting motion of an infinite isothermal vertical plate in the presence of thermal radiation and chemical reaction has been examined in detail in this paper. The fluid considered here is a gray, absorbing emitting radiation but a non-scattering medium. The dimensionless governing coupled linear partial differential equations are solved using the Laplace transform technique. A parametric study is performed to illustrate the influence of the radiation parameter, magnetic parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number and time on the velocity, temperature, concentration. The results are discussed graphically and qualitatively. The numerical results reveal that the radiation induces a rise in both the velocity and temperature, and a decrease in the concentration. The model finds applications in solar energy collection systems, geophysics and astrophysics, aerospace and also in the design of high temperature chemical process systems.

Źródło:

International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 95-105
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

The effect of MHD on free convection with periodic temperature and concentration in the presence of thermal radiation and chemical reaction

Autorzy:

Zigta, P.
Koya, P. R.

Powiązania:

https://bibliotekanauki.pl/articles/265055.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

MHD
unsteady free convection
thermal radiation
chemical reaction
Couette porous plates
magnetohydrodynamika
konwekcja swobodna
promieniowanie cieplne
reakcja chemiczna
przepływ Couette'a

Opis:

This paper studies the effect of magneto hydrodynamics on unsteady free convection between a pair of infinite vertical Couette plates. The temperature of the plates and concentration between the plates vary with time. Convection between the plates is considered in the presence of thermal radiation and chemical reaction. The solution is obtained using perturbation techniques. These techniques are used to transform nonlinear coupled partial differential equations to a system of ordinary differential equations. The resulting equations are solved analytically. The solution is expressed in terms of power series with some small parameter. The effect of various parameters, viz., velocity, temperature and concentration, has been discussed. Mat lab code simulation study is carried out to support the theoretical results. The result shows that as the thermal radiation parameter R increases, the temperature decreases near the moving porous plate while it approaches to a zero in the region close to the boundary layer of the stationary plate. Moreover, as the modified Grashof number, i.e., based on concentration difference, increases, the velocity of the fluid flow increases hence the concentration decreases. An increase in both the chemical reaction parameter and Schmidt number results in decreased concentration.

Źródło:

International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 1059-1073
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Estimation of internal distribution of temperature inside biological tissues by means of multifrequency microwave thermograph

Autorzy:

Stec, B.
Dobrowolski, A.

Powiązania:

https://bibliotekanauki.pl/articles/308150.pdf

Data publikacji:

2002

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

microwave thermograph
radiometer
thermal radiation
breast carcinoma

Opis:

The paper presents problems connected with thermal radiation of human bodies in microwave range in aspect of diagnosis breast carcinoma. A mathematical model of transmission thermal radiation through tissues is introduced and methods of measurement of temperature, depth and size of heat source, by means of multifrequency microwave thermograph [1 - 7], are described. Theoretical considerations are supplemented with presentation of result experiments.

Źródło:

Journal of Telecommunications and Information Technology; 2002, 1; 39-42
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Span-wise fluctuating MHD convective flow of a viscoelastic fluid through a porous medium in a hot vertical channel with thermal radiation

Autorzy:

Singh, K. D.

Powiązania:

https://bibliotekanauki.pl/articles/265309.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

magnetohydrodynamika
promieniowanie
porowatość
magnetohydrodynamics (MHD)
span-wise cosinusoidal
convective
porous medium
radiation

Opis:

An unsteady mixed convection flow of a visco-elastic, incompressible and electrically conducting fluid in a hot vertical channel is analyzed. The vertical channel is filled with a porous medium. The temperature of one of the channel plates is considered to be fluctuating span-wise cosinusoidally, i.e., [...]. A magnetic field of uniform strength is applied perpendicular to the planes of the plates. The magnetic Reynolds number is assumed very small so that the induced magnetic field is neglected. It is also assumed that the conducting fluid is gray, absorbing/emitting radiation and non-scattering. Governing equations are solved exactly for the velocity and the temperature fields. The effects of various flow parameters on the velocity, temperature and the skin friction and the Nusselt number in terms of their amplitudes and phase angles are discussed with the help of figures.

Źródło:

International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 667-681
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Heat and mass transfer effect on an infinite vertical plate in the presence of hall current and thermal radiation with variable temperature

Autorzy:

Manjula, L.
Muthucumaraswamy, R.

Powiązania:

https://bibliotekanauki.pl/articles/2106450.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

magnetohydrodynamika
efekt Halla
promieniowanie
MHD
Hall effect
radiation
vertical plate
variable temperature

Opis:

MHD and radiated heat flow on a rotating system of an electrically conducting fluid in the presence of Hall current under the influence of variable temperature is studied analytically. An exact solution of a non-dimensional form of coupled partial differential equations is obtained by the technique of Laplace transform. The effect of temperature, velocity and concentration is analyzed for various parameters like the Hall parameter [...], thermal radiation [...], rotation parameter [...], Hartmann number [...] and results are discussed in detail with the help of graphs. A mixed analysis of a rotating fluid with Hall current and thermal radiation plays a very essential role in the research area such as plasma physics, MHD generator, fluid drift sensor, cosmological and geophysical level, etc.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 131--140
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Sposob ochistki krysh ehnergosberegajushhikh teplic ot snega
Method of snow cleaning roof energy-efficient greenhouse

Autorzy:

Opryshko, A.
Pasechnik, H.

Powiązania:

https://bibliotekanauki.pl/articles/77451.pdf

Data publikacji:

2014

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

greenhouse
snow
cleaning
energy efficiency
thermal radiation
analysis

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Finite Different Analysis of Free Convection Flow and Heat Transfer of Casson Nanofluid over a Vertical Plate under the Influence of Thermal Radiation

Autorzy:

Sobamowo, M. G.
Okolie, A. C.

Powiązania:

https://bibliotekanauki.pl/articles/1193438.pdf

Data publikacji:

2021

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Casson fluid
Free convection
Nanoparticle
Numerical solutions
Prandtl number
Thermal radiation

Opis:

In this paper, a numerical study on free convection flow and heat transfer of Casson nanofluids over a vertical plate under the influence of thermal radiation is carried out. The governing systems of coupled nonlinear partial differential equations of the flow and heat transfer processes are converted to a system of coupled nonlinear ordinary differential equations through suitable similarity variables. The obtained ordinary differential equations are solved using finite difference method. The results of the numerical solutions are compared with the results of past works as presented in literature and good agreement was established. Also, the effects of thermal radiation; Prandtl number, nanoparticles volume-fraction, shape and type on the flow and heat transfer behaviour of various nanofluids over the flat plate are investigated. The results show that the magnitude of velocity near the plate for the Casson nanofluid parameter decreases for increasing value of the Casson parameter, while temperature increases for increase in Casson fluid parameter. Also, the thermal radiation and volume-fraction of the nanoparticles in the base fluid increase, the velocity, temperature, viscous and thermal boundary layers of the nanofluid increase. However, the velocity of the nanofluid decreases as the Prandtl number increases while the temperature of the nanofluid increases as the Prandtl number increases. The velocity of the nanofluid decreases as the volume-fraction or concentration of the nanoparticle in the base fluid increases. The study can benefit the design engineers enhancing their understanding of the phenomenon for various industrial and engineering applications.

Źródło:

World Scientific News; 2021, 157; 38-66
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Thermal radiation and magnetic field effects on unsteady mixed convection flow and mass transfer over a porous stretching surface with heat generation

Autorzy:

Reddy, G. V. R.
Reddy, B. A.
Reddy, N. B.

Powiązania:

https://bibliotekanauki.pl/articles/955276.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie
wymiana masy
rozciąganie
pole magnetyczne
wytwarzanie ciepła
radiation
mass transfer
stretching surface
magnetic field
heat generation
temperature

Opis:

The effects of thermal radiation and mass transfer on an unsteady hydromagnetic boundary layer mixed convection flow along a vertical porous stretching surface with heat generation are studied. The fluid is assumed to be viscous and incompressible. The governing partial differential equations are transformed into a system of ordinary differential equations using similarity variables. Numerical solutions of these equations are obtained by using the Runge-Kutta fourth order method along with the shooting technique. Velocity, temperature, concentration, the skin-friction coefficient, Nusselt number and Sherwood number for variations in the governing thermo physical parameters are computed, analyzed and discussed.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1151-1164
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Novel Method of Thermal Conductivity Measurement Using Stefan-Boltzmann Law

Autorzy:

Leśniewski, W.
Czekaj, E.
Wieliczko, P.
Wawrylak, M.

Powiązania:

https://bibliotekanauki.pl/articles/356312.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermal conductivity
thermal radiation
ceramic shell mold
aluminum casting

Opis:

The article presents a novel method that allows measurement of thermal conductivity that is based on Stefan-Boltzmann law. The developed method can be used to determine thermal conductivity of ceramic investment casting molds. The methodology for conducting thermal conductivity tests of ceramic material samples is presented. Knowledge of the value of thermal capacity and thermal conductivity as a function of temperature enables computer simulations of the process of cooling and solidification of liquid metal in a mold.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 311-315
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Effects of thermal radiation and heat generation on hydromagnetic flow of nanofluid over an exponentially stretching sheet in a porous medium with viscous dissipation

Autorzy:

Murugesan, Thiagarajan
Kumar, M. Dinesh

Powiązania:

https://bibliotekanauki.pl/articles/1059429.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

MHD
Nanofluid
exponentially stretching sheet
heat generation
porous medium
thermal radiation
viscous dissipation

Opis:

This paper studies, the impacts of heat generation on MHD flow of radiative nanofluid over an exponentially stretching sheet in a porous medium with viscous dissipation are numerically analyzed. Two sorts of nanofluids, generated by solid nanoparticles with water such as alumina-water nanofluid and silver-water nanofluid were investigated. With the use of similarity transformations, to obtain a system of nonlinear ordinary differential equations. The resulting boundary value problem is solved numerically using the Nachtsheim-Swigert shooting technique scheme together with fourth-order Runge-Kutta integration method. Numerical results are obtained for the velocity, temperature distribution and concentration profiles for selected values of the governing physical parameters of combined magnetic interaction and porosity parameter, heat generation parameter, viscous dissipation parameter, thermal radiation parameter, solid volume fraction parameter, chemical reaction parameter and Lewis number are discussed. Quantities of engineering interest such as Skin friction coefficient, Nusselt number, and Sherwood number are also obtained numerically and are tabulated.

Źródło:

World Scientific News; 2019, 128, 2; 130-147
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Effects of heat transfer on unsteady magnetohydrodynamics (MHD) boundary layer flow of an incompressible fluid a moving vertical plate

Autorzy:

Falodun, B. O.
Fadugba, S. E.

Powiązania:

https://bibliotekanauki.pl/articles/1178267.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Boundary layer
Heat transfer
MHD
Thermal radiation
Viscous dissipation

Opis:

This paper deals with the effects of heat transfer on unsteady MHD boundary layer flow of a chemically reading fluid past a vertical plate in the presence of thermal radiation and viscous dissipation. The governing equations of the problem under investigation are systems of partial differential equations. These equations are namely: continuity equation, linear momentum equation and energy equation. These systems of equations were non-dimentionalized by introducing non-dimensional variables. We resulted to dimensionless systems of partial differential equations. The fluid considered in this paper are optically thick, however we employ the Roseland model. Simulations were done numerically on all controlling parameters and the results generated were displayed in graphs and tables. Results review that thermal Grashof number intensifies the velocity profile and increase in Prandtl number leads to decrease in both the velocity and temperature field. Increasing thermal radiation intensifies the velocity and temperature profile. Thermal radiation speeds up the convection flow and thermal boundary layer of the fluid. Increase in magnetic parameter reduces the velocity profile as a result of the applied transverse magnetic field.

Źródło:

World Scientific News; 2017, 88, 2; 118-137
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Chemical reaction effects on MHD flow past a linearly accelerated vertical plate with variable temperature and mass diffusion in the presence of thermal radiation

Autorzy:

Muthucumaraswamy, R.
Geetha, E.

Powiązania:

https://bibliotekanauki.pl/articles/264827.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

izotermiczność
promieniowanie
płyta pionowa
wymiana masy
wymiana ciepła
pole magnetyczne
reakcja chemiczna
accelerated
isothermal
radiation
vertical plate
heat and mass transfer
magnetic field
chemical reaction

Opis:

An exact solution of first order chemical reaction effects on a radiative flow past a linearly accelerated infinite isothermal vertical plate with variable mass diffusion, under the action of a transversely applied magnetic field has been presented. The plate temperature is raised linearly with time and the concentration level near the plate is also raised to C'w linearly with time. The dimensionless governing equations are tackled using the Laplace-transform technique. The velocity, temperature and concentration fields are studied for different physical parameters such as the magnetic field parameter, radiation parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, Prandtl number and time. It is observed that velocity increases with decreasing magnetic field parameter or radiation parameter. But the trend is just reversed with respect to the chemical reaction parameter.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 727-737
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Effects of chemical reaction on transient MHD flow with mass transfer past an impulsively fixed infinite vertical plate in the presence of thermal radiation

Autorzy:

Reddy, B. Prabhakar

Powiązania:

https://bibliotekanauki.pl/articles/264441.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

magnetohydrodynamika
pole magnetyczne
reakcja chemiczna
MHD
magnetic field
fixed vertical plate
chemical reaction parameter
radiation parameter

Opis:

The effects of chemical reaction on a transient MHD mixed convection flow with mass transfer past an impulsively fixed infinite vertical plate under the influence of a transverse magnetic field have been presented. The medium is considered to be non-scattering and the fluid to be non-gray having emitting-absorbing and optically thick radiation limit properties. The dimensionless governing equations of the flow and mass transfer with boundary conditions are solved numerically by using the Ritz finite element method. The numerical results for the velocity, temperature and the concentration profiles as well as the skin-friction coefficient for different values of physical parameters such as the radiation parameter, magnetic parameter, Schmidt number and chemical reaction parameter have been obtained and presented through graphs and tables. It has been found that there is a fall in the temperature and velocity for both air and water as the radiation parameter is increased. An increase in the Schmidt number and chemical reaction parameter results a decrease in the concentration and velocity profiles for both air and water. Furthermore, an increase in the radiation parameter, magnetic parameter, Schmidt number and chemical reaction parameter decreases the skin-friction.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 169-182
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Wpływ oddziaływania cieplnego promieniowania środowiska zewnętrznego na wyniki termowizyjnych badań budynków
The influence of environmental thermal radiation on the results of thermographic investigation of buildings

Autorzy:

Nowak, H.

Powiązania:

https://bibliotekanauki.pl/articles/390390.pdf

Data publikacji:

2013

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

budynki
badania termowizyjne
promieniowanie cieplne
środowisko zewnętrzne
interpretacja termogramu
buildings
thermographic investigation
thermal radiation
environment
interpretation of thermograms

Opis:

Diagnostykę termiczną obiektów budowlanych, głównie budynków mieszkalnych, przeprowadza się obecnie za pomocą standardowej metody badań termowizyjnych, które umożliwiają zbadanie stanu izolacji cieplnej przegród budowlanych, zlokalizowanie mostków cieplnych, wady różnego typu instalacji, zlokalizowanie miejsc zawilgocenia przegród i nadmiernej infiltracji powietrza. Wyniki tych badań wymagają jednak od operatora kamery termowizyjnej rzetelnej wiedzy z zakresu interpretacji termogramów. Jednym z elementów wpływających na wyniki pomiarów termowizyjnych jest cieplne promieniowanie środowiska zewnętrznego. W artykule przedstawiono ogólny opis radiacyjnego oddziaływania środowiska zewnętrznego na budynki, istotę radiacyjnego chłodzenia zewnętrznych powierzchni przegród budowlanych oraz wpływ tego promieniowania na wyniki termowizyjnych badań budynków i na interpretację termogramów.
Thermal diagnostics of building objects, mainly of residential buildings is currently realized with the standard method of thermographic examinations which enables the search the state of the thermal insulation of building envelope, the location of thermal bridges, defects in installations of different types, places of the moisture of barriers and the excessive infiltration of air. However, the operator of the IR-camera must have the solid knowledge in the range of thermograms interpretation. Thermal radiation of the outside environment is one of many factors affecting the results of thermal imaging measurements. The article presents a general description of the thermal radiation influence of the outside environment on buildings, the importance of radiative cooling of building envelope and the influence of this radiation on thermal imaging inspections of buildings and on interpretation of thermograms.

Źródło:

Budownictwo i Architektura; 2013, 12, 3; 59-66
1899-0665

Pojawia się w:

Budownictwo i Architektura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

A Study on the Effects of Inclined Magnetic Field, Flow Medium Porosity and Thermal Radiation on Free Convection of Casson Nanofluid over a Vertical Plate

Autorzy:

Sobamowo, M. G.
Yinusa, A. A.
Makinde, O. D.

Powiązania:

https://bibliotekanauki.pl/articles/1046549.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Casson nanofluid
Flow medium porosity
Free convection
Inclined magnetic field
Thermal radiation
Variational homotopy perturbation method

Opis:

In this paper, variational homotopy perturbation method with Padé approximant technique is applied to investigate the impacts of inclined magnetic field, flow medium porosity and thermal radiation on free convection flow and heat transfer of Casson nanofluids over a vertical plate. The accuracies of the developed analytical methods are verified by comparing the results of the analytical solutions with the results of past works as presented in literature. Thereafter, the analytical solutions are used to investigate the effects of thermal radiation; Prandtl number, nanoparticles volume-fraction, shape and type on the flow and heat transfer behaviour of various nanofluids over the flat plate. It is observed that both the velocity and temperature of the nanofluid as well viscous and thermal boundary layers increase with increase in the radiation parameter. The velocity and temperature of the nanofluid decreases and increases, respectively as the Prandtl number and volume-fraction of the nanoparticles in the basefluid increase. The maximum decrease in velocity and maximum increase in temperature are caused lamina shaped nanoparticle and followed by platelets, cylinder, bricks and sphere-shaped nanoparticles, respectively. It is hoped that the present study will enhance the understanding of free convection boundary-layer problems under the influence of thermal radiation as applied in various engineering processes.

Źródło:

World Scientific News; 2019, 138, 1; 1-64
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Unsteady hydromagnetic mixed convection of a radiating and reacting nanofluid in a microchannel with variable properties

Autorzy:

Kefene, Mesfin Zewde
Makinde, Oluwole Daniel
Enyadene, Lemi Guta

Powiązania:

https://bibliotekanauki.pl/articles/38890072.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

nanofluid
mixed convection
permeable microchannel
Buongiorno’s model
thermal radiation

Opis:

Unsteady MHD mixed convection of nanofluid heat transfer in a permeable microchannel with temperature-dependent fluid properties is studied under the influence of a first-order chemical reaction and thermal radiation. The viscosity and thermal conductivity are assumed to be related to temperature exponentially. Using suitable dimensionless variables and parameters, the governing partial differential equations (PDEs) are transformed to their corresponding dimensionless forms solved numerically by a semi-discretization finite difference scheme along with the Runge-Kutta-Fehlberg integration technique. The effects of model parameters on the profiles of velocity, temperature, concentration, skin friction, the Nusselt number, and the Sherwood number are discussed qualitatively with the aid of graph.

Źródło:

Engineering Transactions; 2023, 71, 1; 53-79
0867-888X

Pojawia się w:

Engineering Transactions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Heat transfer effects on free convection of viscous dissipative fluid flow over an inclined plate with thermal radiation in the presence of induced magnetic field

Autorzy:

Kumar, P. Pramod
Malga, Bala Siddulu
Appidi, Lakshmi
Matta, Sweta

Powiązania:

https://bibliotekanauki.pl/articles/1839898.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

promieniowanie cieplne
pole magnetyczne
konwekcja swobodna
thermal radiation
induced magnetic field
magnetic Prandtl number
free convection
Galerkin finite element method
viscous dissipation

Opis:

The principal objective of the present paper is to know the reaction of thermal radiation and the effects of magnetic fields on a viscous dissipative free convection fluid flow past an inclined infinite plate in the presence of an induced magnetic field. The Galerkin finite element technique is applied to solve the nonlinear coupled partial differential equations and effects of thermal radiation and other physical and flow parameters on velocity, induced magnetic field, along with temperature profiles are explained through graphs. It is noticed that as the thermal radiation increases velocity and temperature profiles decrease and the induced magnetic field profiles increases.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 122-134
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Passive cooling through the atmospheric window for vehicle temperature control

Autorzy:

Khan, Umara
Zevenhoven, Ron

Powiązania:

https://bibliotekanauki.pl/articles/1955001.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermal radiation
passive cooling
vehicle skylight
greenhouse effect
computational fluid dynamics

Opis:

One of the most energy-intensive activities for a vehicle is space air conditioning, for either cooling or heating. Considerable energy savings can be achieved if this can be decoupled from the use of fuel or electricity. This study analyzes the opportunities and effectiveness of deploying the concept of passive cooling through the atmospheric window (i.e. the 8– 14 nm wavelength range where the atmosphere is transparent for thermal radiation) for vehicle temperature control. Recent work at our institute has resulted in a skylight (roof window) design for passive cooling of building space. This should be applicable to vehicles as well, using the same materials and design concept. An overall cooling effect is obtained if outgoing (long wavelength greater than 4 nm) thermal radiation is stronger than the incoming (short wavelength less than 4 nm) thermal radiation. Of particular interest is to quantify the passive cooling of a vehicle parked under direct/indirect sunlight equipped with a small skylight, designed based on earlier designs for buildings. The work involved simulations using commercial computational fluid dynamics software implementing (where possible) wavelengthdependency of thermal radiation properties of materials involved. The findings show that by the use of passive cooling, a temperature difference of up to 7–8 K is obtained with an internal gas flow rate of 0.7 cm/s inside the skylight. A passive cooling effect of almost 27 W/m2 is attainable for summer season in Finland. Comparison of results from Ansys Fluent and COMSOL models shows differences up to about 10 W/m2 in the estimations.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 25--44
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Sensitivity of microwave radiometers with square - law and linear detectors

Autorzy:

Stec, B.
Dobrowolski, A.
Susek, W.

Powiązania:

https://bibliotekanauki.pl/articles/308204.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

termografia mikrofalowa
radiometr
promieniowanie termiczne
microwave thermograph
radiometer
thermal radiation
sensitivity

Opis:

Stochastic analysis of modulation microwave radiometers with square - law and linear detectors is presented in the paper. Assuming ideal detector characteristics it is shown that in typical applications, i.e., in very low power measurements, a type of detector used is of no influence on total radiometer sensitivity. Other aspects of use of a particular detector are also presented.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 1; 112-116
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Unsteady mixed convection nonlinear radiative Casson nanofluid flow with convective boundary condition, heat source and inclined magnetic field effects

Autorzy:

Unyong, Bundit
Govindaraju, Mathialagan
Gunasekaran, Nallappan
Vadivel, Rajarathinam

Powiązania:

https://bibliotekanauki.pl/articles/2141509.pdf

Data publikacji:

2021

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

Casson nanofluid
inclined magnetic field
convective boundary conditions
nonlinear thermal radiation

Opis:

In this paper, we have studied the effect of heat source/sink on unsteady Casson nanofluid past a stretching surface with mixed convection inclined magnetic field and nonlinear thermal radiation numerically. Brownian and thermophoresis effects are studied in this nanofluid model (Buongiorno’s). The governing momentum, energy, and concentration equations are PDEs that are changed into ordinary differential equations by means of suitable transformations. The fourth-order R-K method with shooting technique is adapted to yield the results of this work. The velocity, thermal, and concentration profiles are discussed with the several physical parameters. Also, skin friction, the Nusselt number, and the Sherwood number are examined with the help of the table. It is found that the enhancing value of the unsteady parameter and heat sink parameters reduce the fluid temperature, and the enhancing value of the Casson parameter and heat source parameters increase the fluid temperature. The increasing value of the inclined magnetic field parameter enhances the thermal boundary layer thickness.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 65-76
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

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