This study examines the influence of positions and arrangements of a piezofan having 12-mm wide and 70-mm-long Mylar blade on the thermal performance of two different types of vertical heat sinks. Heat sinks having 11 plate-fins and 100 square pin-fins are tested. The heat transfer coefficient is measured with either a vertical fan and a horizontal fan located at five different locations with distance of 16 mm over fin tip. It is found that the tip amplitude of the Mylar blade is about 7.2 mm. Besides, it is shown that heat transfer coefficient of present heat sinks induced by piezofan show 1.1–2.3 times higher than that under natural convection depending on the fan arrangements and positions. The maximum heat transfer enhancement usually occurs at x/L = 0.5 with either fan arrangement. The heat transfer coefficient is more enhanced with a vertical fan than that with a horizontal fan for either heat sink.
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机译：这项研究研究了具有12毫米宽和70毫米长的聚酯薄膜叶片的压电风扇的位置和布置对两种不同类型的垂直散热器的热性能的影响。测试了具有11个平板散热片和100个方形针状散热片的散热器。传热系数是通过垂直风扇和水平风扇在五个不同的位置进行测量的，这些位置在翅片尖端上的距离为16 mm。发现聚酯薄膜叶片的尖端振幅为约7.2mm。此外，根据风扇的布置和位置，显示出由压电风扇引起的当前散热器的传热系数是自然对流情况下的导热系数的1.1-2.3倍。使用任一风扇布置时，最大的传热增强效果通常在x / L = 0.5时发生。对于任何一个散热器，立式风扇的传热系数都比卧式风扇的传热系数更大。
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