Abstract Heat sinks are widely adopted as heat transfer boosters for their role in promoting heat transfer surface area. To enhance the thermal behaviour of heat sinks under forced convection heat transfer, perforated fins are utilized. In the present investigation, the effect of utilizing the square perforation technique has been experimentally and numerically investigated. The study was conducted for different numbers of perforations, i.e. 4, 6, 9, 12, and 15; heat supplied rates of 1730, 2200, 2680, and 3150 W; and airflow velocities of 0.4, 0.7, 1.1, 1.4, and 1.8 m/s. The present numerical results were validated against the present experimental results and available data in the literature, and excellent agreements were found. Our results indicated that the perforated fin with square perforations has shown a reduction in the fin temperature up to 16 °C compared to the non–perforated one. Moreover, by increasing the number of perforations, higher heat rates were dissipated because of the rise in the flow turbulence level and the reduction in the thermal resistance between the fin surface and its surroundings. In addition, the existence of perforations reduced the friction factor around the fin and sequentially reducing the required flow pumping power, which adds another merit to the aforementioned perforation technique. Using square perforations showed a 5.9% reduction in average friction factor compared to circular perforations.

中文翻译：

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方形穿孔对增强翅片传热的影响：实验和数值研究

摘要 散热器因其在提高传热表面积方面的作用而被广泛用作传热助推器。为了在强制对流热传递下增强散热器的热性能，使用了穿孔翅片。在目前的调查中，利用方形穿孔技术的效果已经通过实验和数值研究。该研究针对不同数量的穿孔进行，即 4、6、9、12 和 15；供热率为 1730、2200、2680 和 3150 W；和 0.4、0.7、1.1、1.4 和 1.8 m/s 的气流速度。目前的数值结果根据目前的实验结果和文献中的可用数据进行了验证，并且发现了极好的一致性。我们的结果表明，与未穿孔的翅片相比，带有方形穿孔的穿孔翅片的翅片温度降低了 16 °C。此外，通过增加穿孔的数量，由于流动湍流水平的升高和翅片表面与其周围环境之间的热阻的降低，更高的热耗被消散。此外，穿孔的存在降低了翅片周围的摩擦系数并依次降低了所需的流动泵功率，这为上述穿孔技术增加了另一个优点。与圆形穿孔相比，使用方形穿孔的平均摩擦系数降低了 5.9%。由于流动湍流水平的升高以及翅片表面与其周围环境之间的热阻降低，因此耗散了更高的热速率。此外，穿孔的存在降低了翅片周围的摩擦系数并依次降低了所需的流动泵功率，这为上述穿孔技术增加了另一个优点。与圆形穿孔相比，使用方形穿孔的平均摩擦系数降低了 5.9%。由于流动湍流水平的升高以及翅片表面与其周围环境之间的热阻降低，因此耗散了更高的热速率。此外，穿孔的存在降低了翅片周围的摩擦系数，并依次降低了所需的流动泵功率，这为上述穿孔技术增加了另一个优点。与圆形穿孔相比，使用方形穿孔的平均摩擦系数降低了 5.9%。