Abstract
The present paper is devoted to the first and second law analysis of a aqueous nano-fluid (NF) containing suspended Ag nanoadditives in two new microchannel heatsinks. The influences of nanoadditives volume fraction (φ) and Reynolds number (Re) on performance indicators based on the first and second law of thermodynamics are taken into account and analyzed. The outcomes reveal that the augmentation of Re and φ causes an intensification in the convective heat exchange coefficient and a decrease in the CPU temperature, thermal irreversibility rate and enhance the CPU temperature uniformity. However, grow of Re intensifies both the pumping power and irreversibility due to flow friction. Additionally, the outcomes depicted the superior performance of NF compared to the base fluid. Moreover, the irreversibility inside the studied heatsinks is mainly due to the heat transfer compared to the flow friction. Finally, the results demonstrate that the heatsink with more path changes is more efficient form the viewpoint of the first and second laws of thermodynamics.
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