压电风扇散热特性的数值实验研究

Numerical Experimental Study on the Horizontal Cooling Characteristics of Piezoelectric Fan

压电风扇因其寿命长、功耗低、占用体积小等优势,在微型电子设备散热领域具有广阔的发展潜力。由于压电风扇在水平方向占用面积更小,因此本文以水平方向布置的压电风扇为研究对象,进行数值模拟研究。研究表明单扇水平扫掠的区域对流换热系数分布呈扇形,与垂直扫掠的哑铃形分布不同。在一定范围内降低风扇高度有利于湍流向风扇下游区域发展,提升下游段的换热性能。风扇高度h/W=0.1时的传热性能最好。可见在一定程度上降低风扇高度可以提高风机的传热性能,但风扇高度过低可能会对传热性能产生一定的负面影响。

Piezoelectric fans have broad development potentialin the field of heat dissipation in microelectronicsdue to their advantages such as long life,low power consumption,and small footprint.Because the piezoelectricfan occupies a smaller area in the horizontal direction,this paper takes the piezoelectric fan arranged in thehorizontal direction as the research object to conduct a numerical simulation study.Studies have shown thatthe horizontal convection heat transfer coefficient distribution of a single fan is fan-shaped,which is differentfrom the vertically-scanned dumbbell-shaped distribution.Reducing the height of the fan within a certainrange is conducive to the development of turbulent flow to the downstream area of the fan and improves theheat transfer performance of the downstream section.The heat transfer performance is best when the fanheighth/W=0.1.It can be seen that reducing the fan height to a certain extent can improve the heat transferperformance of the fan,but if the fan height is too low,it may have a certain negative effect on the heat transferperformance.