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This paper reports an analysis of natural convection and entropy generation inside a square porous enclosure with sinusoidal temperature variation on the side walls. The natural convection heat transfer is calculated by solving numerically the mass, momentum, and energy conservation equations. Moreover, the generation of entropy is discussed in terms of heat transfer irreversibility and fluid friction irreversibility. As thermal boundary conditions, the two horizontal walls are maintained adiabatic. Meanwhile, both symmetric and anti-symmetric sinusoidal temperature distributions are applied to the side walls and the corresponding results are compared. It is found that, although the case with anti-symmetric temperature boundary conditions achieves higher heat transfer, it suffers from high entropy generation rate.

Natural Convection and Entropy Generation in a Porous Enclosure with Sinusoidal Temperature Variation on the Side Walls