Interaction of surface radiation with combined conduction and convection from a discretely heated L-corner |
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Authors: | C Gururaja Rao D Santhosh P Vijay Chandra |
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Institution: | (1) Department of Mechanical Engineering, National Institute of Technology, Warangal, Andhra Pradesh, 506004, India |
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Abstract: | Prominent results pertaining to the problem of multi-mode heat transfer from an L-corner equipped with three identical flush-mounted
discrete heat sources in its left leg are given here. The heat generated in the heat sources is conducted along the two legs
of the device before being dissipated by combined convection and radiation into air that is considered to be the cooling agent.
The governing equations for temperature distribution along the L-corner are obtained by making appropriate energy balance
between the heat generated, conducted, convected and radiated. The non-linear partial differential equations thus obtained
are converted into algebraic form using a finite-difference formulation. The resulting equations are solved simultaneously
by Gauss–Seidel iterative solver. A computer code is specifically written to solve the problem. The computational domain is
discretised using 101 grids along the left leg, with 15 grids taken per heat source, and 21 grids along the bottom leg. The
effects of surface emissivity, convection heat transfer coefficient, thermal conductivity and aspect ratio on local temperature
distribution, peak device temperature and relative contributions of convection and radiation to heat dissipation from the
L-corner are studied in detail. The point that one cannot overlook radiation in problems of this class has been clearly elucidated. |
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