冲击射流冷却高功率电子元件的试验研究

Experimental study on impinging jet cooling of high power electronic components

电子产品的发展趋势是运行速度快、发热功率大、体积小,散热能力对其性能影响很大。冲击射流因其冷却效果好被广泛用于冷却电子产品。基于冲击射流冷却技术,设计搭建了一个空气冲击射流冷却试验装置,通过试验研究了加热功率、射流温度、喷嘴与壁面间距离和喷嘴直径对空气冲击射流换热的影响:加热功率在15.7~49.0 W范围内,沿径向壁面温度均先降后升、换热系数先增后减;随着加热功率增大,壁面径向温度分布越不均匀、平均温度升高,对换热系数没有影响;射流温度一定,沿径向壁面温度先降后升、局部换热系数先增后减;随着射流温度升高,壁面平均温度小幅升高、径向温度分布越均匀,空气物性发生变化,换热系数略有提高,但换热系数的最大值位置不变。

The development trend of electronic products is fast running,high heating power and small volume.Its heat dissipation capacity has a great impact on its performance.Impinging jet is widely used to cool electronic products because of its good cooling effect.Based on impinging jet cooling technology,an air impinging jet cooling experimental device was designed and built.The effects of heating power,jet temperature,distance between nozzle and wall and nozzle diameter on the heat transfer of air impinging jet were studied experimentally:when the heating power is between 15.7 W and 49.0 W,the radial wall temperature first decreases and then rises,and the heat transfer coefficient increases first and then decreases;with the increase of heating power,the radial temperature distribution becomes more uneven and the average temperature increases,which has no effect on the heat transfer coefficient;when the jet temperature is constant,the wall temperature decreases first and then increases and then decreases;with the increase of jet temperature,the wall surface is flat When the average temperature increases slightly and the radial temperature distribution is more uniform,the air physical properties change and the heat transfer coefficient increases slightly,but the position of the maximum value of the heat transfer coefficient remains unchanged.