Extended surfaces are widely investigated for their ability to enhance the heat transfer rates in different applications. Pin-fin and plate-fin heat sinks are used in a variety of cases involving a miniaturized to the large systems. The present study compares the performance of the pin-fin and the plate-fin heat sink under similar forced flow conditions. The experimental data for a modified pin fin heat sink with wings and a plate-fin heat sink with dimples are collected for the Reynolds number in the range of 6800–15100. The Nusselt number, friction factor, and thermo-hydraulic performance (THP) are examined for different geometries of the heat sink and the enhancements brought out in the heat transfer and friction are gauged relative to the smooth plate. The pin fin heat sink yields two-fold enhancement in heat transfer as compared to the plate-fin heat sink. The maximum thermo-hydraulic performance of the pin-fin heat sink with wings is found to be 4.52 at a pitch ratio (S/D_f) of 2 and Wing length ratio (L_w/D_f). For the plate fin heat sink with dimples, the maximum thermo-hydraulic performance is found to be 4.67 at dimple diameter ratio (D/d) of 0.5 and dimple pitch ratio (s/d) of 2.5. The correlations of the Nusselt number and friction factor are proposed for different geometries of fins.

扩展表面因其在不同应用中提高传热速率的能力而被广泛研究。针翅式和板翅式散热器用于各种涉及小型化到大型系统的情况。本研究比较了在类似强制流动条件下针翅片和板翅片散热器的性能。收集了雷诺数在 6800-15100 范围内的带翼的改进型针翅式散热器和带凹坑的板翅式散热器的实验数据。针对不同几何形状的散热器检查了努塞尔数、摩擦系数和热液压性能 (THP)，并测量了相对于光滑板的传热和摩擦增强。与板翅式散热器相比，针翅式散热器在传热方面产生了两倍的增强。在节距比 (S/D) 下，带翼的针翅式散热器的最大热工水力性能为 4.52_f ) 的 2 和翼长比 (L _w /D _f )。对于带凹坑的板翅式散热器，在凹坑直径比 (D/d) 为 0.5 和凹坑节距比 (s/d) 为 2.5 时，发现最大热液压性能为 4.67。针对不同几何形状的翅片提出了努塞尔数和摩擦系数的相关性。