Abstract
A computational study of mixed convective heat transfer with surface radiation in a rectangular channel with heat spreader attached to each heat source is performed. The working fluid is air and flow is steady, incompressible and laminar. The parameters like thickness of the substrate and heat spreader, heat source and channel width and the distance between the heat sources are fixed. The governing equations are solved using ANSYS 16.2 with SIMPLE algorithm. The influence of Reynolds number (Re = 100, 250, 500, and 750), emissivity of the heat source (εc = 0.1 to 0.9), heat spreader (εsp = 0.1 to 0.9) and channel wall (εs = 0.1 to 0.9) on the rate of heat transfer is studied. It is revealed that the non-dimensional maximum temperature (θm) decreases 11.53% at reference values with respect to without spreader case due to insertion of heat spreader. It is also observed that emissivity of the heat source is insignificant compared to emissivity of heat spreader and channel wall.
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