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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015007089
pages 995-1017

SIMULATION STUDIES OF MULTIMODE HEAT TRANSFER FROM A DISCRETELY HEATED VERTICAL CHANNEL

Shrikant Londhe
Department of Mechanical Engineering, National Institute of Technology, Warangal - 506004 (A. P) India
C. Gururaja Rao
Department of Mechanical Engineering, National Institute of Technology, Warangal - 506004 (A. P) India

ABSTRACT

Findings of certain parametric studies made on conjugate mixed convection with surface radiation from a discretely heated vertical channel are reported here. The vertical channel has three identical discrete heat sources flush-mounted in its left wall, with the right wall serving the purpose of a heat sink. The channel is considered to be of fixed height, with its width varied by altering the aspect ratio that is defined as the ratio of the height to the width of the channel. The cooling medium is air and the heat generated in the heat sources is dissipated by a combination of mixed convection and radiation after its percolation through the channel wall. The fluid flow and heat transfer equations are considered without making the conventional boundary layer approximations and are solved using the finite volume method coupled with stream function−vorticity formulation. A computer code is prepared to solve the problem. The influence of parameters like the modified Richardson number, surface emissivity, thermal conductivity, and aspect ratio on pertinent results has been analyzed. The exclusive effect of radiation has been explored and the roles taken up by mixed convection and radiation in channel heat dissipation are investigated. The studies elucidate the prominence radiation assumes in the present kind of problems in different regimes of mixed convection.


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