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1

Numerical study of a transient MHD flow across an oscillating vertical plate with thermal radiation and viscous dissipation

Rajaraman R., Muthucumaraswamy R.

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 2

77--89

EN

The flow of an electrically conducting fluid across a vertically positioned oscillating semi-boundless plate with uniform mass diffusion and temperature is examined in this study in terms of the effects of thermal radiation and viscous dissipation. The dimensionless governing equations were solved using an effective and unconditionally stable implicit finite-difference approach known as the Crank-Nicolson method. Based on the numerical results, the impacts of various physical parameter values on concentration, temperature; velocity; Sherwood numbers, Nusselt numbers and skin-friction profiles are displayed graphically and their consequences thoroughly analyzed. We observed that when the magnetic field, radiation and phase angle parameters are increased, the velocity is reduced. This shows that plate oscillation, radiation and magnetic fields affect the flow pattern significantly.

2

Impacts of chemical reaction, thermal radiation, and heat source/sink on unsteady MHD natural convective flow through an oscillatory infinite vertical plate in porous medium

Saikia Dibya Jyoti, Ahmed Nazibuddin

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 4

114--136

EN

The main objective of this exploration is to analyze the effects of heat source/sink, chemical reactions, and radiation on the unsteady free convective flow through a porous medium using an infinitely oscillating vertical plate. The Laplace transformation tactics is utilized to solve the governing equations for concentration, energy, and momentum. The simulation results demonstrate that the chemical reaction parameter dwindles both primary and secondary velocities. It has been noted that an upsurge in heat generation (heat source) enhances the temperature field, while a decrease in heat absorption (heat sink) leads to a reduction in the temperature field. Furthermore, the radiation parameter causes a drop in both temperature and velocity patterns. The equation for skin friction is derived and presented graphically, and 3-dimensional surface plots are provided to depict the Nusselt number and Sherwood number. Additionally, graphical illustrations are employed to showcase the influence of various non-dimensional variables on concentration, temperature, and velocity patterns.

3

Study of temperature field in large-span steel structure under radiation-thermal-fluid coupling

Jiang Pengcheng

Archives of Civil Engineering

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2023

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Vol. 69, nr 1

661--674

EN

The non-uniformity of temperature field distribution of long-span steel structure is proportional to the intensity of solar radiation. Based on the background of Guangzhou Baiyun Station large-span complex steel roof structure, this paper studies the non-uniform temperature field distribution of large-span steel structure under the Summer Solstice daily radiation-thermal-fluid coupling action based on Star-ccm+ finite element software, and uses Spa2000 software to analyze the stress and deformation of steel roof under temperature action. Combined with the on-site temperature monitoring, the maximum difference with the measured value is 2.5°C compared with the numerical simulation results, which verifies the validity of the finite element simulation. The results show that: from 8:00, with the increase of solar altitude angle, the intensity of solar radiation increases, the temperature rises, and the temperature distribution of large-span steel structure becomes more and more non-uniform. From14:00 to18:00, the solar radiation weakens, and the temperature distribution tends to be uniform. Finally, reasonable construction suggestions and measures are proposed to reduce the adverse effects of temperature effects, which can provide theoretical references for the safe construction and normal operation of large-span steel structures located in the subtropics.

4

Testing of Large Scale Pool Fire of Technical Ethanol

Tępiński Jarosław, Klapsa Wojciech, Cygańczuk Krzysztof, Lesiak Piotr, Lewak Michał Wojciech

Safety & Fire Technology

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2022

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Vol. 59, iss. 1

96--109

EN

Aim: The aim of this article is to determine the characteristics of a pool fire, including the temperatures and thermal radiation densities caused by it. Mappings of pool fires occurring in actual emergency events were conducted by performing large-scale polygon tests. Project and methods: Experimental study of pool fire of technical ethanol was carried out on a specially built test stand in the training area of the Training Centre in Pionki of the Regional Headquarters of the State Fire Service in Warsaw. The pool fire test stand consisted of a test tray, with a test chamber with the diameter of 300 cm, founded on a reinforced concrete slab. Using a developed measurement system with data acquisition that included measurement sensors mounted at defined locations relative to the fire, temperatures and thermal radiation densities were measured at various distances/locations relative to the fire. Metrological data such as air temperature, atmospheric pressure, humidity, wind direction and speed were monitored and recorded using the weather station. The height of the fire flame was measured by comparing it to racks set up nearby with marked scales of specific lengths. Results: A polygon stand that was built to study pool fires, equipped with a temperature and thermal radiation density measuring system with measuring sensors distributed in defined locations, is discussed. A study of a pool fire resulting from the combustion of dehydrated, fully contaminated ethanol was conducted. The study measured temperatures, thermal radiation densities, and flame heights. The average and maximum values of temperatures and thermal radiation densities during the steady-state combustion stage (i.e., phase II of the fire) were determined. Conclusions: Based on the presented results of temperature and thermal radiation density measurements at various distances/locations relative to the pool fire site, there was a significant effect of wind direction and speed on these values. Higher temperature and heat radiation density were recorded at the sensors on the leeward side than on the windward side. As the wind speed decreased, there was an increase in the temperature values recorded on the thermocouples located above the centre of the bottom of the tray test chamber due to the flame, which, when not blown away, was allowed to rise vertically upward and fully sweep the temperature sensors.

PL

Cel: Celem artykułu jest określenie charakterystyki pożaru powierzchniowego, w tym temperatur i gęstości promieniowań cieplnych przez niego wywoływanych. Odwzorowania pożarów powierzchniowych mających miejsce w rzeczywistych zdarzeniach awaryjnych przeprowadzono poprzez wykonanie poligonowych badań w dużej skali. Projekt i metody: Badanie doświadczalne pożaru powierzchniowego etanolu technicznego zrealizowano na specjalnie do tego celu zbudowanym stanowisku badawczym na terenie poligonu Ośrodka Szkolenia w Pionkach Komendy Wojewódzkiej Państwowej Straży Pożarnej w Warszawie. W skład stanowiska do badania pożarów powierzchniowych wchodziła taca badawcza, o średnicy komory badawczej wynoszącej 300 cm, posadowiona na płycie żelbetowej. Przy pomocy opracowanego układu pomiarowego z akwizycją danych, w skład którego wchodziły czujniki pomiarowe zamontowane w zdefiniowanych lokalizacjach względem pożaru, dokonano pomiarów temperatur i gęstości promieniowań cieplnych w różnych odległościach/lokalizacjach względem miejsca pożaru. Za pomocą stacji pogodowej monitorowano i rejestrowano dane metrologiczne, takie jak temperatura powietrza, ciśnienie atmosferyczne, wilgotność, kierunek i prędkość wiatru. Pomiaru wysokości płomienia pożaru dokonano przez jego porównanie z ustawionymi w pobliżu stojakami z zaznaczonymi podziałkami o określonych długościach. Wyniki: Omówiono poligonowe stanowisko, które zostało zbudowane do badania pożarów powierzchniowych, wyposażone w układ pomiarowy temperatur i gęstości promieniowań cieplnych z czujnikami pomiarowymi rozmieszczonymi w zdefiniowanych lokalizacjach. Przeprowadzono badania pożaru powierzchniowego powstałego w wyniku spalania etanolu odwodnionego, całkowicie skażonego. W ramach badań dokonano pomiarów temperatur, gęstości promieniowań cieplnych oraz wysokości płomienia. Wyznaczono średnie i maksymalne wartości temperatur i gęstości promieniowań cieplnych w etapie ustalonego spalania (tzn. II faza pożaru). Wnioski: Na podstawie przedstawionych wyników pomiarów temperatur i gęstości promieniowań cieplnych w różnych odległościach/lokalizacjach względem miejsca pożaru powierzchniowego, odnotowano znaczący wpływ kierunku i prędkości wiatru na te wartości. Wyższą temperaturę i gęstość promieniowań cieplnych rejestrowano na czujnikach po stronie zawietrznej niż po stronie nawietrznej. Na skutek spadku prędkości wiatru następował wzrost wartości temperatur rejestrowanych na termoparach umieszczonych nad środkiem dna komory badawczej tacy, co było spowodowane przez płomień, który niezdmuchiwany, mógł unosić się pionowo do góry i w pełni omiatać czujniki temperatury.

5

Badania pożarów strumieniowych propanu przeprowadzone w dużej skali

Tępiński Jarosław, Lewak Michał, Lesiak Piotr

Przemysł Chemiczny

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2022

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T. 101, nr 11

950--956

PL

Przedstawiono i omówiono wyniki pomiarów temperatury i promieniowania cieplnego w czasie pożaru strumieniowego propanu wydobywającego się pod ciśnieniem z instalacji gazowej. Badania pożaru strumieniowego w dużej skali przeprowadzono na poligonowym stanowisku badawczym zbudowanym na terenie Ośrodka Szkolenia w Pionkach Komendy Wojewódzkiej Państwowej Straży Pożarnej w Warszawie.

EN

A test of propane jet fire was performed in an outdoor test stand built in the fire brigade training center. A propane jet with a flow rate of about 196.1 m3/h for 110 s was continuously released from pressurized liquid propane tank. The values of temp. and thermal radiation were recorded at 20 and 4 measuring points, resp. A significant effect of even low wind speeds on the values of the recorded parameters was obsd. The results of measurements of temp., thermal radiation and flame dimensions allowed to estimate the effects of jet fire.

6

Chemical reaction and MHD flow for magnetic field effect on heat and mass transfer of fluid flow through a porous medium onto a moving vertical plate

Goud B. Shankar, Nandeppanavar Mahantesh M.

International Journal of Applied Mechanics and Engineering

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2022

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Vol. 27, no. 2

226--244

EN

This article discusses the effect of heat and mass transfer in a boundary layer flow in the presence of a magnetic field of an electrically conducting and viscous fluid as it passes through a porous medium containing a heat source and a chemical reaction. By employing similarity variables, the governing equations are changed into nonlinear ordinary differential equations(ODEs). To solve the obtained equations numerically the Keller box method is used. Numerical and graphical representations of the results of different parameter values governing the flow system are given. The non-dimensional distributions of velocity, heat, and concentration are depicted graphically, while the Nusselt number, Sherwood number, and skin friction are determined numerically.

7

Absorption characteristics of thermal radiation for carbon dioxide

Kubicki Jan, Kopczyński Krzysztof, Młyńczak Jarosław

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2022

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T. 12, nr 3

4--7

EN

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.

PL

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.

8

Simulations of Heat Transfer through Multilayer Protective Clothing Exposed to Flame

Puszkarz Adam K., Machnowski Waldemar

Autex Research Journal

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2022

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Vol. 22, no. 3

298--304

EN

In this paper, the safety and thermal comfort of protective clothing used by firefighters was analyzed. Three-dimensional geometry and morphology models of real multilayer assemblies used in thermal protective clothing were mapped by selected Computer-Aided Design (CAD) software. In the designed assembly models, different scales of the resolution were used for the particular layers – a homogenization for nonwoven fabrics model and designing the geometry of the individual yarns in the model of woven fabrics. Then, the finite volume method to simulate heat transfer through the assemblies caused by their exposure to the flame was applied. Finally, the simulation results with experimental measurements conducted according to the EN ISO 9151 were compared. Based on both the experimental and simulation results, parameters describing the tested clothing protective features directly affecting the firefighter’s safety were determined. As a result of the experiment and simulations, comparable values of these parameters were determined, which could show that used methods are an efficient tool in studying the thermal properties of multilayer protective clothing.

9

Promieniowanie cieplne i konwekcja wymuszona w piecach do hartowania szkła płaskiego

Rantala Mikko

Świat Szkła

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2021

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R. 26, nr 2

38--44

10

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

Unyong Bundit, Govindaraju Mathialagan, Gunasekaran Nallappan, Vadivel Rajarathinam

Journal of Applied Mathematics and Computational Mechanics

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2021

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Vol. 20, nr 3

65--76

EN

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.

11

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

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

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 4

77--98

EN

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.

12

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

Raptis A.

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 2

235--241

EN

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.

13

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

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

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 1

122--134

EN

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.

14

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

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

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 1

1--17

EN

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.

15

Effect of thermal radiation on biomagnetic fluid flow and heat transfer over an unsteady stretching sheet

Alam Jahangir Md., Murtaza Ghulam Md., Tzirtzilakis Efstratios E., Ferdows Mohammad

Computer Assisted Methods in Engineering and Science

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2021

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Vol. 28, no. 2

81--104

EN

This study examines the influence of thermal radiation on biomagnetic fluid, namelyblood that passes through a two-dimensional stretching sheet in the presence of magneticdipole. This analysis is conducted to observe the behavior of blood flow for an unsteadycase, which will help in developing new solutions to treat diseases and disorders related tohuman body. Our model is namely biomagnetic fluid dynamics (BFD), which is consistentwith two principles: ferrohydrodynamic (FHD) and magnetohydrodynamic (MHD), whereblood is treated as electrically conductive. It is assumed that the implemented magneticfield is sufficiently strong to saturate the ferrofluid, and the variation of magnetization withtemperature may be approximated with the aid of a function of temperature distinction.The governing partial differential equations (PDEs) converted into ordinary differentialequations (ODEs) using similarity transformation and numerical results are thus obtainedby using the bvp4c function technique in MATLAB software with considering applicableboundary conditions. With the help of graphs, we discuss the impact of various param-eters, namely radiation parameter, unsteady parameter, permeability parameter, suctionparameter, magnetic field parameter, ferromagnetic parameter, Prandtl number, velocityand thermal slip parameter on fluid (blood) flow and heat transfer in the boundary layer.The rate of heat transfer and skin friction coefficient is also computationally obtained forthe requirement of this study. The fluid velocity decreases with increasing values of themagnetic parameter, ferromagnetic interaction parameter, radiation parameter whereastemperature profile increases for the unsteady parameter, Prandtl number, and permeability parameter. From the analysis, it is also observed that the skin friction coefficientdecreases and the rate of heat transfer increases respectively with increasing values ofthe ferromagnetic interaction parameter. The most important part of the present analy-sis is that we neither neglect the magnetization nor electrical conductivity of the bloodthroughout this study. To make the results more feasible, they are compared with thedata previously published in the literature and found to be in good accuracy.

16

Influence of thermal diffusion on MHD radiating flow in presence of Cu-nanoparticles, Casson fluid and angle of inclination

Brahma-Chary S., Jayarami-Reddy K., Kashaiah K.

Journal of Applied Mathematics and Computational Mechanics

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2020

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Vol. 19, nr 2

43--58

EN

In this study numerical solutions for magnetohydrodynamic transfer, thermal and mass instability, free convection flow through the plate before Casson fluid, heat dissipation, thermal radiation, heat sink, chemical reaction, tilt angle, and saturated porous medium were described. The effectiveness of this study is to analyze the effect of heat diffusion, Casson fluid, the angle of interest on the flow phenomenon of Cu-nanoparticles in the presence of thermal radiation, heat source/heat sink, destructive reaction, heat transfer and mass transfer in a simple way. The finite difference method was used to solve the governing equations which are the added partial differential equations. The effects of different material parameters on velocity, temperature and concentration profiles are explained using graphs and tables. The results are compared with previously published papers and a very good agreement is found. In the boundary layer region, fluid velocity decreases with the increasing values of magnetic field parameter, heat source/sink, Casson fluid, angle of inclination and thermal radiation parameter for Cu-nanoparticles. Also it is noticed that the solutal boundary layer thickness decreases with an increase in the chemical reaction parameter. It is because chemical molecular diffusivity reduces for higher values of Kr.

17

Outcome of nanofluid flow containing arbitrary shape nanoparticles induced by a permeable stretching sheet

Sarkar A., Kundu P. K.

International Journal of Applied Mechanics and Engineering

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2020

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Vol. 25, no. 2

142--156

EN

In this work we have discussed the impact of thermal radiation on heat transfer to nanofluid flow over an unsteady permeable stretching sheet using various types of arbitrary shape nanoparticles of Copper (Cu), Silver (Ag), Alumina [...], and Titania Oxide [...] in the base fluid. Suitable transformations have been employed to build ODEs from the partial differential equations. Numerical results are therefore obtained particularly for cylindrical shape and spherical shape nanoparticles. Our analysis substantiates that the velocity and temperature profiles increases with enhanced thermal radiation parameter. Further, Nusselt number is more advanced for the nanofluid that contains cylindrical shape nanoparticles as compared to spherical shape nanoparticles.

18

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

Zigta B.

International Journal of Applied Mechanics and Engineering

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2020

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Vol. 25, no. 1

219--235

EN

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.

19

Heat and mass transfer effects on MHD flow past an inclined porous plate in the presence of chemical reaction

Sandhya A., Ramana Reddy G. V., Deekshitulu V. S.R.G.

International Journal of Applied Mechanics and Engineering

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2020

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Vol. 25, no. 3

86--102

EN

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.

20

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

Zigta B.

International Journal of Applied Mechanics and Engineering

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2020

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Vol. 25, no. 3

198--211

EN

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.