In this experimental and numerical study, the heat transfer enhancement of heat sink using square micro-pin fins is investigated under forced convection. Micro pin fins of various height and spacing are considered in this analysis. Twenty five heat sinks are tested for three different heat load and Reynolds number range 4500 to 6500. The results show that the dimensionless heat transfer coefficient (Nusselt number) increases with increasing pin fin height and Reynolds number however, it decreases with increasing fin spacing. On the other hand, the heat sink of large fin height has lower thermal resistance at the cost of large pressure drop. The cooling performance of micro pin fin heat sinks is about 10% higher than the plate fin under forced convection. But, it is slightly more sensitive to pin-fin height compared to the pin-fin spacing. Further, it was observed that the heat sink of pin fin height 7.1 μm and fin spacing 35 μm possesses comparatively better system performance and fin effectivity to other heat sinks. The numerical results of pressure drop (Δp) and Nusselt Number (Nu) agree well with the experimental results with typical discrepancies in the prediction of Δp and Nu of 15% and 25%, respectively.

在这项实验和数值研究中，研究了强制对流下使用方形微针翅片的散热器的传热增强。在此分析中考虑了各种高度和间距的微型销翅片。针对三种不同的热负荷和雷诺数范围 4500 到 6500 测试了 25 个散热器。结果表明无量纲传热系数（努塞尔数）随着针翅高度和雷诺数的增加而增加，但随着翅片间距的增加而减小。另一方面，大鳍片高度的散热器以大压降为代价具有较低的热阻。微针翅片散热器在强制对流下的散热性能比板翅式散热片高10%左右。但是，与针鳍间距相比，它对针鳍高度更敏感。更多，观察到pin fin高度为7.1 μm、翅片间距为35 μm的散热器与其他散热器相比具有更好的系统性能和翅片效率。压降 (Δp) 和努塞尔数 (Nu) 的数值结果与实验结果非常吻合，典型的 Δp 和 Nu 预测差异分别为 15% 和 25%。