Analytical solutions for entropy generation rate distribution associated with heat transfer and fluid friction in microchannel heat sinks are examined. Microchannel heat sinks are modeled as a porous medium through which fluid flows. Analytical solutions are obtained by using velocity and temperature distributions of microchannel heat sinks, which are based on the modified Darcy model for fluid flow and the two-equation model for heat transfer. Using the analytical solution, the entropy generation of heat sinks was obtained. The effects of height, channel width, and fin thickness on the entropy generation rate were studied and thermal optimization of heat sink was performed.

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