influence of thermal radiation on unsteady free convection mhd flow of brinkman type fluid in a porous medium with newtonian heating
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2013
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Abstract
The focus of this paper is to analyze the influence of thermal radiation on some unsteady magnetohydrodynamic (MHD) free convection flows of an incompressible Brinkman type fluid past a vertical flat plate embedded in a porous medium with the Newtonian heating boundary condition. The fluid is considered as a gray absorbing-emitting but nonscattering medium and the Rosseland approximation in the energy equations is used to describe the radiative heat flux for optically thick fluid. For a detailed analysis of the problem, four important situations of flow due to (i) impulsive motion of the plate (ii) uniform acceleration of the plate (iii) nonuniform acceleration of the plate, and (iv) highly nonuniform acceleration of the plate are considered. The governing equations are first transformed into a system of dimensionless equations and then solved analytically using the Laplace transform technique. Numerical results for temperature and velocity are shown graphically, while skin friction and Nusselt number are computed in tables. The results show that temperature and velocity increase on increasing radiation and Newtonian heating parameters. However, the results of magnetic and porosity parameters on velocity are found quite opposite.
| Reference Key |
ali2013mathematicalinfluence
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|---|---|
| Authors | ;Farhad Ali;Ilyas Khan;Sami Ul Haq;Sharidan Shafie |
| Journal | journal of power sources |
| Year | 2013 |
| DOI |
10.1155/2013/632394
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| URL | |
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