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Tytuł:
Unsteady MHD thermal diffusive and radiative fluid flow past a vertical porous plate with chemical reaction in slip flow regime
Autorzy:
Ravi Kumar, D.
Jayarami Reddy, K.
Raju, M. C.
Powiązania:
https://bibliotekanauki.pl/articles/265452.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
swobodna konwekcja
magnetohydrodynamika
przenoszenie ciepła
dyfuzja termiczna
promieniowanie
reakcja chemiczna
poślizg
MHD
free convection
heat and mass transfer
slip flow regime
thermal diffusion
radiation
chemical reaction
Opis:
An analytical solution of an MHD free convective thermal diffusive flow of a viscous, incompressible, electrically conducting and heat-absorbing fluid past a infinite vertical permeable porous plate in the presence of radiation and chemical reaction is presented. The flow is considered under the influence of a magnetic field applied normal to the flow. The plate is assumed to move with a constant velocity in the direction of fluid flow in slip flow regime, while free stream velocity is assumed to follow the exponentially increasing small perturbation law. The velocity, temperature, concentration, skin friction, Nusselt number and Sherwood number distributions are derived and have shown through graphs and tables by using the simple perturbation technique.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 117-129
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Toluene Mono-nitration in a Semi-batch Reactor
Autorzy:
Chen, L. P.
Chen, W. P.
Liu, Y.
Peng, J. H.
Liu, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/358853.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
toluene mono-nitration
apparent activation energy
semi-batch reaction
thermal hazard
Opis:
Toluene mono-nitration in a semi-batch reactor was investigated with reaction calorimeter (RC1). The mixed acid HNO3/H2SO4/H2O (wt%) was used in proportion 13/66/21, which is similar to industrial parameters. The exothermic rates at different reaction temperatures were compared, and then the curves of heat generation rate after dosing were analyzed. The Maximal Temperature attainable by runaway of the desired Synthetic Reaction (MTSR) under different conditions were calculated for the course hazard evaluation. The results showed that the average reaction heat of mono-nitration was between 169.07~177.11 kJ mol-1, and the special heat of reactant was about 2 kJ kg-1 K-1. Average Ea of second order kinetic was about 30 kJ mol-1, and reaction rate was 10-4 mol s-1 l-1 order of magnitude when the strength of sulphuric acid was about 73.5%. It was also found that when temperature or stirring speed increases, the potential heat accumulation decreases.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 2; 37-47
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Soveršenstvovanie normativnoj metodiki opredeleniâ inercionnogo intervala vremeni srabatyvaniâ orositelâ
Improvement of the Standard Technique for Determination of the Sprinkler Response Time
Udoskonalenie normatywnej metodyki określenia czasu zadziałania tryskacza pożarowego
Autorzy:
Kitsak, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/373540.pdf
Data publikacji:
2016
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
sprinkler
thermal element
inertial interval of reaction
heat flow
direction of heat flow
tryskacz
element termoczuły
czas zadziałania
strumień powietrza
kierunek strumienia powietrza
Opis:
Objective: The most important standard indicator which is determined during the sprinkler testing is the time of their reaction. This parameter is used to determine thermal sensitivity of the sprinkler triggering element and determines the speed of its activation. Analysis of modern standard methods for determining the parameters of sprinkler response time showed that the use of the heating mode of the heating sprinkler element when determining the factor of thermal conductivity does not provide the condition of stationary heat transfer for the heating elements, which is necessary to obtain correct results when evaluating this parameter. In the European standard EN 12259-1:1999 and international standard ISO/FDIS 6182 sprinkler reaction time is defined only at the direction of the heat flow perpendicular to an axis of the sprinkler thermal element. It is known that convective heat transfer occurs at the normal body component of the heat flow. Consequently, the heat transfer coefficient of thermal elements and sprinkler reaction time depend on the direction of the heat flow. The purpose of this article is the improvement of a standard technique of sprinkler reaction time by specifying the measurement procedure of the heat leakage factor from the sprinkler heat element towards the body of the sprinkler and including the dependence between sprinkler reaction time and the direction of airflows on the thermal element. Project and methods: In order to achieve the set objective, applied was a mathematical and experimental of method of modeling of processes of heating sprinkler thermal element using airflows of different temperatures and directions. Results: The theoretical analysis of the process of the heating sprinkler thermal element of heat flow with linearly time-varying temperature, was conducted. The conditions of heating, in which the relation used in the existing standards for the evaluation of thermal conductivity of factor C were determined. A significant increase in sprinkler reaction time under the influence of heat flow along the axis of its heating elements was experimentally determined. Conclusions: In order to increase the accuracy of evaluation of conductivity coefficient of the thermal element of the sprinkler, it is necessary to carry out heating of the sprinkler in the heating chamber in a constant manner using linearly varying temperature starting from the assembly temperature to the operational temperature. In order to properly classify sprinklers according to their response time, the evaluation of the indicator of the response time should be carried out also when heat is directed along the axis of the thermal element of the sprinkler, regardless of its type.
Cel: Najważniejszym normatywnym parametrem, ocenianym podczas badań tryskaczy, jest ich czas zadziałania. Parametr ten służy do wyznaczania czułości termicznej elementu tryskacza oraz określenia szybkości jego zadziałania. Analiza obowiązujących metod normatywnych do określenia parametrów czasu zadziałania tryskaczy wykazała, że stosowana w nich technika nagrzewania elementu termoczułego podczas wyznaczania współczynnika przewodności cieplnej nie zapewnia całkowitego spełnienia restrykcyjnego warunku stacjonarności wymiany ciepła między elementem termoczułym, który jest niezbędny do uzyskania prawidłowych wyników w ocenie tego parametru. Europejski standard EN 12259-1:1999 i międzynarodowy standard ISO/FDIS 6182 opisują badanie wyznaczenia czasu zadziałania tryskaczy wyłącznie poprzez skierowanie strumienia nagrzanego powietrza w kierunku prostopadłym do osi elementu termoczułego tryskacza. Wiadomo, że przekazanie ciepła przez konwekcję zachodzi według normalnej składowej strumienia ciepła. Dlatego też współczynnik wymiany ciepła do elementu termoczułego i czas zadziałania tryskacza zależą od kierunku strumienia ciepła. Celem pracy jest udoskonalenie metody normatywnej do wyznaczania czasu zadziałania tryskacza poprzez doprecyzowanie procedury pomiaru współczynnika odpływu ciepła od elementu termoczułego w stronę korpusu tryskacza i uwzględnienia zależności między czasem zadziałania tryskacza a kierunkiem strumieni powietrza oddziałujących na element termoczuły. Projekt i metody: W celu realizacji postawionego celu wykorzystano metodę matematycznego i eksperymentalnego modelowania procesów nagrzewania elementu termoczułego tryskacza strumieniami powietrza o różnej temperaturze i kierunku. Wyniki: Przeprowadzono analizę teoretyczną procesu nagrzewania elementu termoczułego tryskacza podczas działania strumienia powietrza ze zmieniającą się temperaturą. Określono warunki nagrzewania, przy których otrzymuje się prawidłowy wynik zależności stosowanej w aktualnych normach w celu wyznaczenia współczynnika przewodności cieplnej C. W sposób eksperymentalny wykazano znaczne zwiększenie czasu zadziałania tryskacza przy oddziaływaniu ciepła wzdłuż osi jego elementu termoczułego. Wnioski: W celu zwiększenia dokładności oceny współczynnika przewodności C elementu termoczułego tryskacza nagrzewanie tryskacza należy przeprowadzać w komorze cieplnej w sposób stały, temperaturą zmieniającą się liniowo zaczynając od temperatury montażowej do temperatury zadziałania. W celu poprawnej klasyfikacji tryskaczy według czasu zadziałania ocenę wskaźnika czasu zadziałania RTI, należy przeprowadzać również przy działaniu ciepła wzdłuż osi elementu termoczułego tryskaczy, niezależnie od ich typu.
Źródło:
Bezpieczeństwo i Technika Pożarnicza; 2016, 42, 2; 81-86
1895-8443
Pojawia się w:
Bezpieczeństwo i Technika Pożarnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation and chemical reaction effects on MHD flow along a moving vertical porous plate
Autorzy:
Reddy, G. V. R.
Reddy, N. B.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/265207.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
porowatość
promieniowanie cieplne
wymiana ciepła
wymiana masy
reakcja chemiczna
MHD
porous medium
thermal radiation
heat and mass transfer
chemical reaction
Opis:
This paper presents an analysis of the effects of magnetohydrodynamic force and buoyancy on convective heat and mass transfer flow past a moving vertical porous plate in the presence of thermal radiation and chemical reaction. The governing partial differential equations are reduced to a system of self-similar equations using the similarity transformations. The resultant equations are then solved numerically using the fourth order Runge-Kutta method along with the shooting technique. The results are obtained for the velocity, temperature, concentration, skin-friction, Nusselt number and Sherwood number. The effects of various parameters on flow variables are illustrated graphically, and the physical aspects of the problem are discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 157-168
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peritectic Determination by a Melt Deck Thermal Analysis System
Autorzy:
Tuttle, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/382534.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal analysis
solidification
continuous casting
peritectic reaction
analiza termiczna
krzepnięcie
odlewanie ciągłe
reakcja perytektyczna
Opis:
There has been a growing interest in the peritectic due to increasing productivity, quality, and alloy development. Differential scanning calorimetry (DSC) has traditionally been used to study steel solidification but suffers significant limitations when measuring the solidus and peritectic. This work covers a new thermal analysis system that can characterize the peritectic reaction. Heats of AISI/SAE 1030 and 4130 steel were poured to provide some benchmarking of this new technique. The peritectic was detected and the reaction temperature measured. Measurements agree reasonably well with reference information. A review of the literature and thermodynamic calculations did find some disagreement on the exact temperatures for the peritectic and solidus. Some of this difference appears to be related to the experimental techniques employed. It was determined that the system developed accurately indicates these reaction temperatures. The system provides a unique method for examining steel solidification that can be employed on the melt deck.
Źródło:
Archives of Foundry Engineering; 2019, 1; 83-88
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study on extraction of tritium generated in HMR by way of system composed of EXEL-process and thermal diffusion column cascade
Autorzy:
Shimizu, M.
Takeshita, K.
Powiązania:
https://bibliotekanauki.pl/articles/146995.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
chemical exchange reaction
heavy water
isotope separation
thermal diffusion
trickel-bed reactor
tritium
Opis:
A new tritium extraction system composed of a trickle-bed hydrogen/water isotopic exchange column using a hydrophobic Pt-catalyst combined with an SPE-water electrolyser (EXEL-process) and a thermal diffusion column cascade was proposed for the removal of tritium from heavy water irradiated in HMR ((Heavy Water Moderated Power Reactor), volume of heavy water = 140 m3 and mean neutron flux = 5×1013 n/cm2s). Numerical study on the extraction of tritium from the heavy water was carried out and the dimensions of proposed system were determined under the conditions that the concentration of tritium in the heavy water was kept less than 2.5 Ci/lHW. The calculation results indicated that the proposed system was designed practically.
Źródło:
Nukleonika; 2002, 47,suppl.1; 89-93
0029-5922
1508-5791
Pojawia się w:
Nukleonika
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:
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
Artykuł
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
Artykuł
Tytuł:
Heat and mass transfer effects on MHD flow past an inclined porous plate in the presence of chemical reaction
Autorzy:
Sandhya, A.
Ramana Reddy, G. V.
Deekshitulu, V. S.R.G.
Powiązania:
https://bibliotekanauki.pl/articles/1839806.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reakcja chemiczna
źródło ciepła
promieniowanie cieplne
chemical reaction
heat source
inclined plate
porous medium
thermal radiation
Opis:
The impact of heat and mass transfer effects on an MHD flow past an inclined porous plate in the presence of a chemical reaction is investigated in this study. An effort has been made to explain the Soret effect and the influence of an angle of inclination on the flow field, in the presence of the heat source, chemical reaction and thermal radiation. The momentum, energy and concentration equations are derived as coupled second order partial differential equations. The model is non-dimensionalized and shown to be controlled by a number of dimensionless parameters. The resulting dimensionless partial differential equations can be solved by using a closed analytical method. Numerical results for pertaining parameters, such as the Soret number (Sr), Grashof number (Gr) for heat and mass transfer, the Schmidt number (Sc), Prandtl number (Pr), chemical reaction parameter (Kr), permeability parameter (K), magnetic parameter (M), skin friction (τ), Nusselt number (Nu) and Sherwood number (Sh) on the velocity, temperature and concentration profiles are presented graphically and discussed qualitatively.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 86-102
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Wyświetlanie 1-15 z 21

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