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Journal of Porous Media
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ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v16.i11.10
pages 967-977

MIXED CONVECTION ON A PERMEABLE STRETCHING CYLINDER WITH PRESCRIBED SURFACE HEAT FLUX IN POROUS MEDIUM WITH HEAT GENERATION OR ABSORPTION

Sadegh Khalili
Binghamton University
Arezoo Khalili
Department of Mechanical Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran
Sara Kafashian
Department of Energy System Engineering, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
Abbas Abbassi
Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave., P.O. Box 15875-4413, Tehran, Iran

RÉSUMÉ

The steady mixed convection boundary layer flow due to a permeable stretching cylinder with prescribed heat flux in porous medium with heat generation/absorption is investigated numerically. The governing system of partial differential equations is converted into a system of ordinary differential equations using similarity transformation, which is then solved numerically by the fourth-order Runge-Kutta method with shooting technique. The influence of the governing parameters, namely the permeability, heat generation/absorption, suction/injection, Prandtl number, and Reynolds number on the flow and heat transfer characteristics are analyzed and discussed. It is found that the skin-friction coefficient and the Nusselt number at the surface increase as the Prandtl number increases. The same behavior is observed for the wall permeability parameter while the opposite behavior is observed for the heat generation parameter and Reynolds number of the cylinder. On the other hand, in the case of opposing flow with an increase in the mixed convection parameter velocity decreases whereas the temperature increases but the opposite behavior is observed in the case of assisting flow.


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