机械振动对脉动热管传热性能影响实验研究

Experimental Study on the Heat Transfer Performance of PHP under Vibration

航空、机车等装载平台上的高功率电子设备均工作在振动中,有特殊的散热需求,脉动热管作为新型相变传热技术,将具有广阔的应用前景。文中开展实验研究脉动热管在振动条件下的启动性能和稳定传热性能,通过一板式脉动热管的线性扫频振动实验和随机振动实验,测试脉动热管的工作特性。实验表明:振动条件下脉动热管的启动无温度飞升段;在所有振动频率段中,振动条件下,加热功率越大,当量导热系数越小,和无振动情况下,情况正好相反;在低加热功率条件下,振动条件下的脉动热管当量导热系数均较无振动情况大,而且振动频率越高,当量导热系数越大。

This paper performs experimental research on the start-up and heat transfer performance of pulsating heat pipe （PHP） under vibration conditions, concerning PHP has a wide potential prospect in electronics cooling in aircraft, vehicle, and other vibrative platform. Experiment results of a fiat-plate PHP in linear sweep frequency vibration and random vibration test showed： the temperature of the evaporator section in PHP increase gently and has no soaring period while start-up under vibration conditions; the equivalent thermal conductivity of the PHP under vibration conditions is more than no vibration situation while low heat power, and the higher the frequency, the bigger the thermal conductivity.