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Tytuł:
Reduction of silicon photomultipliers thermal generation in self-coincidence system applied in low level light measurements
Autorzy:
Baszczyk, M.
Dorosz, P.
Głąb, S.
Kucewicz, W.
Mik, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/201762.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Silicon Photomultiplier
SiPM
thermal generation
photon detector
cosmic rays
Opis:
The paper presents method for thermal generation reduction in low level light applications, especially where measured phenomena have random character. The algorithm was developed basing on cosmic ray measurements. The main parts of the system are: Silicon Photomultipliers (SiPM), front-end ASIC for amplifying and shaping signals. SiPM is a very sensitive device which can detect single photons. Comparing to a standard photomultiplier SiPM has a compact size, low operating voltage and it is immune to an electromagnetic field. Thermally generated signals are disadvantage of SiPM. This paper presents the measurement method to reduce influence of thermal generation.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 505-510
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of technical efficiency of heat and electric power generation
Autorzy:
Piwowarska, H.
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259361.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Data Envelopment Analysis (DEA)
technical efficiency
Malmquist index
thermal power generation
Opis:
This paper presents an evaluation of technical efficiency and time-dependent changes in productivity of Polish professional electric power and heat & electric power stations by using Data Envelopment Analysis non-parametric method. The research covered the enterprises whose total available electric power amounted to about 98% of that of all professional thermal electric power stations in this country. The analysis has concerned the years 2000÷2004. Impact was considered of such factors as: scale of enterprise activity, form of ownership as well as type of carried out activity, on technical efficiency and time-dependent productivity changes. Changes in productivity of the power generation sector were determined by means of Malmquist index.
Źródło:
Polish Maritime Research; 2009, S 1; 39-44
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further Study on Thermal Performance of Porous Fin with Temperature-Dependent Thermal Conductivity and Internal Heat Generation using Galerkin’s method of Weighted Residual
Autorzy:
Sobamowo, M. G.
Kamiyo, O. M.
Adeleye, O. A.
Powiązania:
https://bibliotekanauki.pl/articles/1046542.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Galerkin’s method of weighted residual
Porous Fin
Surface convective heat transfer
Temperature-Dependent Thermal Conductivity and Internal Heat Generation
Thermal performance
Opis:
This work is presented as a further study to our previous work, “Thermal performance analysis of a natural convection porous fin with temperature-dependent thermal conductivity and internal heat" published in "Thermal Science and Engineering Progress. 1 (2017) 39–52”, where it was assumed that the surface convection is negligible and heat is transferred only by natural convection in the porous fin. In this present study, such an assumption has been relaxed. Also, effects of surface convective heat transfer on the thermal performance of porous fin with temperature-dependent thermal conductivity and internal heat generation have been investigated using Galerkin’s method of weighted residual. The results of the Galerkin’s method of weighted residual show excellent agreement with the results of numerical method using shooting method coupled with Runge-Kutta method and also with the results of homotopy perturbation method. Thereafter, the developed analytical solutions are used to investigate the influences of the thermal model parameters on the thermal performance of the porous fin. It is found as the with the other model parameters that as the convective parameter increases, the rate of heat transfer from the base of the fin increases and consequently, the porous fin efficiency improves. However, increase in the nonlinear thermal conductivity parameter decreases the temperature distribution in the fin. Based on the high accuracy of the Galerkin’s method of weighted residual as displayed in this work, it is hoped that the simple analytical solutions given by the approximate analytical method will enhance the analysis of extended surfaces and also assist the designers.
Źródło:
World Scientific News; 2019, 138, 2; 167-191
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two calculation schemes for determination of thermal stresses due to frictional heating during braking
Dwa schematy obliczeń do opisania naprężeń termicznych wywołanych nagrzewaniem tarciowym podczas hamowania
Autorzy:
Yevtushenko, A.
Kuciej, M.
Powiązania:
https://bibliotekanauki.pl/articles/279991.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
braking
friction
heat generation
temperature
thermal stresses
Opis:
Thermal stresses in three-element (disc/pad/metal slice) and two-element (disc/pad) models of frictional heating during braking are analysed. Evolutions and distributions of the lateral normal stresses in depth from the surface of friction are studied for the following frictional system materials: cast iron/ metal ceramics/steel and metal ceramics/cast iron.
W pracy przeanalizowano rozkład naprężeń termicznych w trzy- (tarcza/nakładka/zacisk) oraz dwu- (tarcza/nakładka) elementowych układach nagrzewanych tarciowo podczas hamowania. Dla materiałów tarciowych: żeliwo/metalo- ceramika/stal oraz żeliwo/metalo-ceramika, zbadano ewolucję oraz rozkład normalnych naprężeń termicznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 3; 605-621
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Internal Heat Generation on the Thermal Stability of a Porous Fin
Autorzy:
Sobamowo, M. G.
Jayesimi, L. O.
Waheed, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/1031875.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Differential Transformation Method
Porous Fin
Temperature-Dependent Internal Heat Generation
Thermal analysis
Thermal performance
Opis:
In this study, the effects of internal heat generation on thermal stability of porous fin is theoretical investigated using differential transform method. The parametric studies reveal increase in the internal heat generation leads to increase in the value or the range of the thermal stability of the fin. The internal heat generation can be used to control the thermal instability in the fin. Also, as the porosity parameter increase, the rate of heat transfer from the base of the fin and consequently improve the efficiency of the fin increase. However, a high value or an excessive internal heat generation results in an undesirable situation where some of the heat energy cannot escape to the sink and instead ends up flowing into the prime surface and the fin tends to store heat rather than dissipating it. This scenario defeats the prime purpose of the cooling fin. Therefore, the operational parameters must be carefully selected to ensure that the fin retains its primary purpose of removing heat from the primary surface.
Źródło:
World Scientific News; 2020, 149; 110-127
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient free convective radiative flow between vertical parallel plates heated/cooled asymmetrically with heat generation and slip condition
Autorzy:
Gaur, P. K.
Sharma, R. P.
Jha, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/264930.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
wytwarzanie ciepła
promieniowanie cieplne
MHD
slip flow
heat generation
thermal radiation
Opis:
Investigation of an MHD convective flow of viscous, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel porous plates is carried out. Forchheimer-Brinkman extended Darcy model is assumed to simulate momentum transfer within the porous medium. A magnetic field of uniform strength is applied normal to the plates. The analytical results are evaluated numerically and the presented graphically to discuss in detail the effects of different parameter entering into the problem.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 365-384
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Nanofluid motion past a shrinking sheet in porous media under the impact of radiation and heat source/sink
Autorzy:
Sharma, R. P.
Jha, A. K.
Gaur, P. K.
Mishra, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/264665.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
promieniowanie cieplne
wytwarzanie ciepła
MHD
nanofluid
shrinking surface
thermal radiation
heat generation
porous medium
Opis:
An investigation has been carried out for the MHD 3-dimensional flow of nanofluid over a shrinking sweet saturating a porous media in the presence of thermal radiation and heat generation. Convective boundary conditions for the flow phenomena are used in the present analysis. The governing equations are reduced to ODEs employing suitable similarity transformations. The solutions of formulated differential equations have been attained mathematically by fourth order R-K technique along with the shooting method. The impact of the governing constraints on momentum, heat, and local Nusselt number, are explored. It is noticed that the momentum and heat decrease with raise in the porosity variable, temperature reduces with an enhance in the thermal radiation variable, and temperature enhances with an enhance in the heat source/sink parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 183-199
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of multiple-area renewable integrated hydro-thermal system considering artificial rabbit optimized PI (FOPD) cascade controller and redox flow battery
Autorzy:
Saha, Arindita
Chiranjeevi, Tirumalasetty
Devarapalli, Ramesh
Babu, Naladi Ram
Dash, Puja
Garcìa Màrquez, Fausto Pedro
Powiązania:
https://bibliotekanauki.pl/articles/27324511.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
solar thermal
automatic generation control
geothermal
artificial rabbit optimization
redox flow battery
PI(FOPD) controller
Opis:
The current task explores automatic generation control knowledge under old-style circumstances for a triple-arena scheme. Sources in area-1 are thermal-solar thermal (ST); thermalgeothermal power plant (GPP) in area-2 and thermal-hydro in area-3. An original endeavour has been set out to execute a new performance index named hybrid peak area integral squared error (HPA-ISE) and two-stage controller with amalgamation of proportional-integral and fractional order proportional-derivative, hence named as PI(FOPD). The performance of PI(FOPD) has been compared with varied controllers like proportional-integral (PI), proportional-integralderivative (PID). Various investigation express excellency of PI(FOPD) controller over other controller from outlook regarding lessened level of peak anomalies and time duration for settling. Thus, PI(FOPD) controller’s excellent performance is stated when comparison is undergone for a three-area basic thermal system. The above said controller’s gains and related parameters are developed by the aid of Artificial Rabbit Optimization (ARO). Also, studies with HPA-ISE enhances system dynamics over ISE. Moreover, a study on various area capacity ratios (ACR) suggests that high ACR shows better dynamics. The basic thermal system is united with renewable sources ST in area-1 also GPP in area-2. Also, hydro unit is installed in area-3. The performance of this new combination of system is compared with the basic thermal system using PI(FOPD) controller. It is detected that dynamic presentation of new system is improved. Action in existence of redox flow battery is also examined which provides with noteworthy outcome. PI(FOPD) parameters values at nominal condition are appropriate for higher value of disturbance without need for optimization.
Źródło:
Archives of Control Sciences; 2023, 33, 4; 861--884
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie skompilowanych badań termicznych w charakterystyce skał macierzystych na przykładzie warstw menilitowych
The use of compiled thermal methods in the characteristics of source rocks on the example of menilite beds
Autorzy:
Labus, Małgorzata
Kierat, Maria
Matyasik, Irena
Spunda, Karol
Kania, Małgorzata
Janiga, Marek
Bieleń, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1834987.pdf
Data publikacji:
2019
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
analiza termiczna
termograwimetria
piroliza
warstwy menilitowe
potencjał generacyjny
thermal analysis
thermogravimetric
pyrolysis
Menilite Beds
generation potential
Opis:
Celem badań było porównanie wyników termicznego rozkładu materii organicznej przy zastosowaniu różnych metod badawczych. Eksperymenty wykonano dla oceny metod interpretacyjnych w charakterystyce potencjału generacyjnego skał macierzystych. Badania przeprowadzono dla próbek łupków menilitowych, uznanych na podstawie wieloletnich badań geochemicznych za dobrej jakości skały macierzyste. Próbki reprezentowały warstwy menilitowe jednostki śląskiej, pobrane z karpackich odsłonięć powierzchniowych. Badania przy zastosowaniu znanych metod: pirolizy Rock-Eval (RE), metody termograwimetrycznej i kalorymetrycznej (TG/DSC) oraz metody pirolizy połączonej z analizą chromatografii gazowej (PY-GC), były wykonywane na tych samych próbkach – zarówno na próbkach skalnych, jak i na wyizolowanym kerogenie. Takie zintegrowane badania nie były dotychczas prowadzone na żadnym materiale skalnym. Zastosowane metody badawcze wykazały znaczną porównywalność otrzymanych wyników. Znaleziono szereg korelacji pomiędzy parametrami z poszczególnych metod, między innymi: ilości węglowodorów wydzielonych podczas PY-GC w przedziale temperatur 300–650°C, a parametrem S2 z RE oraz ubytkiem masy w analizie TG w tym samym przedziale temperatur; wartości S2 próbek skalnych oraz kerogenu z ubytkiem masy w efekcie pirolizy z analizy TG/DSC w temperaturach z zakresu 300–650°C; wartości temperatury maksimum piku S2 (Tpk2) próbek skalnych z temperaturą maksymalnego ubytku masy podczas analizy TG; zawartości węgla rezydualnego (RC) z analizy RE próbek skały i kerogenu z ubytkiem masy w efekcie spalania rezydualnej materii organicznej z analizy TG/DSC w temperaturach z zakresu 650– 1050°C. Ubytek masy, oznaczony podczas analizy termograwimetrycznej, zestawiony z procentowym udziałem poszczególnych frakcji węglowodorowych, w których znaczący udział mają frakcje C9+ potwierdza ropotwórczy charakter substancji organicznej zawartej w warstwach menilitowych. Badania porównawcze metod pirolitycznych: Rock Eval, TG/DSC oraz PY-GC dowiodły kompatybilności wyników uzyskanych wszystkimi metodami. Każda z metod ponadto umożliwia pozyskanie wzajemnie uzupełniających się informacji odnośnie zawartości TOC, stopnia dojrzałości termicznej, jak i typu generowanych węglowodorów oraz innych niewęglowodorowych związków. Przeprowadzone testy oraz wykonane korelacje pokazały celowość stosowania zespołu metod termicznych dla pozyskania kompletnych informacji dotyczących skał macierzystych.
The aim of the research was to compare the results of the thermal decomposition of organic matter using different research methods. Experiments were carried out to assess interpretation methods in the characterization of the generation potential of source rocks. The research was conducted for samples of Menilite shales, recognized on the basis of long-term geochemical studies as good quality source rocks. The samples represented the Menilite Beds of the Silesian Unit, taken from the outcrops in the Carpathians. Research using known methods: Rock-Eval pyrolysis (RE), thermogravimetric and calorimetric methods (TG/DSC), and pyrolysis methods combined with gas chromatography analysis (PY-GC), were performed on the same samples- both on rock samples, as well as isolated kerogen. Such integrated studies have so far not been conducted on any rock material. The applied research methods showed a significant comparability of the results obtained. A number of correlations were found between the parameters from individual methods, including: the amount of hydrocarbons separated during PY-GC in the temperature range of 300–650°C, and the parameter S2 from RE, and mass loss in the TG analysis in the same temperature range; S2 values of rock samples and kerogen with weight loss as a result of pyrolysis from TG/DSC analysis at temperatures in the range of 300–650°C; temperature values of the maximum peak S2 (Tpk2) of rock samples with the maximum mass loss temperature during TG analysis; residual carbon content (RC) from RE analysis of rock and kerogen samples with a mass loss as a result of burning residual organic matter from TG/DSC analysis at temperatures in the range of 650–1050°C. The mass loss determined during thermogravimetric analysis, combined with the percentage share of individual hydrocarbon fractions, in which the C9+ fraction is significant, confirms the high petroleum potential of the organic substance contained in the Menilite Beds. Comparative studies of pyrolytic methods: Rock Eval, TG/DSC and PY-GC have proved the compatibility of the results obtained with all methods. Each of the methods also makes it possible to obtain mutually complementary information relating to the TOC, the degree of thermal maturity and type of generated hydrocarbons and other non-hydrocarbon compounds. The conducted tests and performed correlations showed the usefulness of a set of thermal methods to obtain complete information on source rocks.
Źródło:
Nafta-Gaz; 2019, 75, 2; 67-76
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemically reacting Jeffrey fluid flow over a deformable porous layer with entropy generation analysis
Autorzy:
Das, Utpal Jyoti
Powiązania:
https://bibliotekanauki.pl/articles/2174171.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
odkształcenie
warstwa porowata
dyfuzja termiczna
deformable porous layer
Jeffrey fluid
entropy generation
Bejan number
thermal diffusion
Opis:
Entropy generation of a steady Jeffrey fluid flow over a deformable vertical porous layer is analysed with consideration of a first-order chemical reaction and thermal diffusion. The porous material is modelled as a homogeneous binary mixture of fluid and solid phases where each point in the binary mixture is occupied concurrently by the fluid and solid. The combined phenomenon of solid deformation and fluid movement is taken into account. The impact of relevant parameters on the fluid velocity, solid displacement, temperature and concentration profiles is discussed. It is noticed that the Jeffrey fluid parameter enhances the entropy generation number, fluid velocity and solid displacement profiles, but a reverse effect is seen for the Bejan number. Further, entropy generation, fluid velocity and solid displacement reduce due to the higher estimates of the chemical reaction parameter, while the Bejan number enhances.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 36--48
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermosensitive response of a functionally graded cylinder with fractional order derivative
Autorzy:
Lamba, Navneet Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2174162.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termoczułość
naprężenia termiczne
wytwarzanie ciepła
time fractional
thermal stresses
thick hollow cylinder
internal heat generation
FGMs
thermosenstive
Opis:
The present paper deals with thermal behaviour analysis of an axisymmetric functionally graded thermosensitive hollow cylinder. The system of coordinates are expressed in cylindrical-polar form. The heat conduction equation is of time-fractional order02<α≤, subjected to the effect of internal heat generation. Convective boundary conditions are applied to inner and outer curved surfaces whereas heat dissipates following Newton’s law of cooling. The lower surface is subjected to heat flux, whereas the upper surface is thermally insulated. Kirchhoff’s transformation is used to remove the nonlinearity of the heat equation and further it is solved to find temperature and associated stresses by applying integral transformation method. For numerical analysis a ceramic-metal-based functionally graded material is considered and the obtained results of temperature distribution and associated stresses are presented graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 107--124
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Mixed convective flow with variable viscosity and variable thermal conductivity in a channel in the presence of first order chemical reaction with heat generation or absorption
Autorzy:
Shobha, K. C.
Biradar, Mahadev
Mallikarjun B, Patil
Powiązania:
https://bibliotekanauki.pl/articles/1839861.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
mixed convection
variable viscosity
variable thermal conductivity
first order chemical reaction
heat generation/absorption
konwekcja mieszana
zmienna lepkość
zmienna przewodność cieplna
wytwarzanie ciepła
absorpcja ciepła
Opis:
A study has been made on the flow and heat transfer of a viscous fluid in a vertical channel with first order chemical reaction and heat generation or absorption assuming that the viscosity and thermal conductivity are dependent on the fluid temperature. The temperature of the walls is maintained constant. Under these assumptions, the governing balance equations of mass, momentum and energy are formulated. The dimensionless forms of the governing equations are coupled and non-linear, which cannot be solved analytically and therefore require the use of the Runge-Kutta fourth order along with shooting technique. Graphs for velocity and temperature under different values of parameters involved are plotted and discussed. The skin friction and Nusselt number on the channel walls are also computed and discussed. Furthermore, the investigation found that variable viscosity and variable thermal conductivity enhance the velocity and temperature of the flow.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 91-102
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entropy analysis of third-grade MHD convection flows from a horizontal cylinder with slip
Autorzy:
Madhavi, K.
Prasad, V. R.
Gaffar, S. A.
Venkatadri, K.
Powiązania:
https://bibliotekanauki.pl/articles/139843.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
third-grade viscoelastic fluid model
thermal jump
entropy generation
Bejan number
Hartmann number
lepkosprężysty model cieczy trzeciego stopnia
skok termiczny
generowanie entropii
liczba Bejana
liczba Hartmanna
Opis:
In thermos fluid dynamics, free convection flows external to different geometries, such as cylinders, ellipses, spheres, curved walls, wavy plates, cones, etc., play major role in various industrial and process engineering systems. The thermal buoyancy force associated with natural convection flows can play a critical role in determining skin friction and heat transfer rates at the boundary. In thermal engineering, natural convection flows from cylindrical bodies has gained exceptional interest. In this article, we mathematically evaluate an entropy analysis of magnetohydrodynamic third-grade convection flows from permeable cylinder considering velocity and thermal slip effects. The resulting non-linear coupled partial differential conservation equations with associated boundary conditions are solved with an efficient unconditionally stable implicit finite difference Keller-Box technique. The impacts of momentum and heat transport coefficients, entropy generation and Bejan number are computed for several values of non-dimensional parameters arising in the flow equations. Streamlines are plotted to analyze the heat transport process in a two-dimensional domain. Furthermore, the deviations of the flow variables are compared with those computed for a Newtonian fluid and this has important implications in industrial thermal material processing operations, aviation technology, different enterprises, energy systems and thermal enhancement of industrial flow processes.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 3; 417-440
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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