Optimization of constructal design of a microchannel heat sink

TL;DRAbstract

Past studies have shown that a good microchannel design depends on its lower thermal resistance. However, latest theory based on entropy generation minimization (EGM) stated that lower entropy generation rate must also be considered for an optimized microchannel design as is discussed in basic thermodynamics. The present study applies the entropy generation minimization (EGM) method on Li and Peterson’s optimized parallel flow rectangular microchannel. Thermal resistance model, total pressure drop model, and entropy generation rate model are derived to analyze the effects of channel aspect ratio, channel width to channel pitch ratio, heat flux, and pumping power on thermal performance of the microchannel heat sink. The thermal resistance agreed with that of Li and Peterson’s of channel aspect ratio of 6 and a channel number of 120, but the entropy generation rate was not minimized. For the same entropy generation rate value with the same design, an optimum channel number is found to be

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