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.

中文翻译：

---

两种新型微通道散热器中银-水纳米流体流动的数值评估：热性能和热力学考虑

摘要 本文致力于对在两个新型微通道散热器中含有悬浮 Ag 纳米添加剂的水性纳米流体 (NF) 进行第一定律和第二定律分析。基于热力学第一定律和第二定律，考虑并分析了纳米添加剂体积分数(φ)和雷诺数(Re)对性能指标的影响。结果表明，Re 和 φ 的增加导致对流热交换系数的增强和 CPU 温度和热不可逆率的降低，并增强了 CPU 的温度均匀性。然而，由于流动摩擦，Re 的增长增强了泵送能力和不可逆性。此外，结果表明 NF 与基液相比具有优越的性能。而且，研究的散热器内部的不可逆性主要是由于与流动摩擦相比的传热。最后，结果表明，从热力学第一定律和第二定律的角度来看，具有更多路径变化的散热器更有效。