This study investigates the thermal performance of square pin-fin heat sinks for different operating conditions including different heat flux and different Reynolds numbers. Two heat sinks with different sizes of copper square pin-fins cross section (2-mm fins and 500-μm fins) in-line arranged are experimentally investigated to determine their thermal performance quantified in terms of thermal resistance. The investigation is carried out for a Reynolds numbers between 80 and 470, and heating rate between 21.9–46.7 W. The results indicate that the thermal resistance is lower for micrometer sized fins for smaller Reynolds number as compared to millimeter sized. However, for the larger Reynold numbers, thermal resistance of millimeter sized fins was observed to be lower. The fluid velocity plays a very important role in heat transfer, and it has more pronounced effect on the thermal resistance compared to the fins size.

这项研究调查了方形针翅式散热器在不同工作条件下的热性能，包括不同的热通量和不同的雷诺数。通过实验研究了两个不同尺寸的直排铜方形散热片（2-mm散热片和500-μm散热片）的散热器，以确定通过热阻量化的热性能。对雷诺数在80到470之间，加热速率在21.9–46.7 W之间进行了研究。结果表明，雷诺数较小的微米级翅片的热阻低于毫米尺寸。但是，对于较大的雷诺数，可以观察到毫米大小的散热片的热阻较低。流体速度在传热中起着非常重要的作用，