Abstract In the present study, numerical investigation of hotspot heat transfer in a microchannel pin-fin hybrid heat sink is accomplished. The proposed heat sink consists of 20 microchannels at background zone and 143 pin-fins at hotspot zone. Therefore, the effect of parameters including geometrical properties (pin-fin shape, pin-fin angle and microchannel wall wave amplitude), Reynolds number and hotspot heat flux on different decisive parameters of heat sinks are investigated. Parameters such as average pressure drop, pumping power, mean absolute temperature difference (MATD) at background zone, MATD at hotspot zone and thermal resistance are considered as performance parameters. The results show that rectangular pin-fin with rounded edges have better thermal performance than NACA airfoil. Besides, increasing the NACA airfoil angle increases the heat transfer and consequently leads to decrease in hotspot temperature. Also, numerical results show that increasing the wall wave amplitude increases the heat transfer rate.

中文翻译：

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使用微通道针翅式混合散热器的几何和操作参数进行热点性能分析

摘要 在本研究中，完成了微通道针翅混合散热器中热点传热的数值研究。拟议的散热器由背景区的 20 个微通道和热点区的 143 个针鳍组成。因此，研究了几何特性（针翅形状、针翅角度和微通道壁波幅）、雷诺数和热点热通量等参数对散热器不同决定性参数的影响。诸如平均压降、泵送功率、背景区的平均绝对温差 (MATD)、热点区的 MATD 和热阻等参数被视为性能参数。结果表明，圆边矩形针翅比NACA翼型具有更好的热性能。除了，增加 NACA 翼型角会增加传热，从而导致热点温度降低。此外，数值结果表明，增加壁面波振幅会增加传热速率。