乙醇水溶液脉动热管传热特性研究

Study on Heat Transfer Properties of Aqueous Ethanol Pulsating Heat Pipe

以体积分数为50%的乙醇水溶液为工质,在充液率为50%的情况下,对多环路脉动热管的传热特性进行试验与机理研究,并与无水乙醇的传热效果进行对比。结果表明,采用乙醇水溶液的热管热阻明显低于无水乙醇脉动热管的热阻,并且加热功率的极限值较高。当倾角为90°时,采用乙醇水溶液的热阻值最低约0.1℃/W,传热极限约为300 W。采用无水乙醇作为脉动工质,倾角为60°时的热阻为采用酒精水溶液的1.34～1.49倍,倾角为30°时的热阻为1.28～1.50倍。

With aqueous ethanol of 50% volume fraction as working fluid and filling ratio of 50%,heat transfer performances of multi-loop pulsating heat pipe（PHP） are studied by experiment and mechanism.Heat transfer effects are compared between aqueous ethanol and ethanol.The results show that thermal resistance of PHP with aqueous ethanol is lower than that with ethanol and the maximum of heating power with aqueous ethanol is higher than that with ethanol obviously.The minimum of thermal resistance with working fluid of aqueous ethanol and inclination angle of 90° is about 0.1 °C/W,and the maximum of heating power is about 300 W.Thermal resistance with working fluid of ethanol and inclination angle of 60° is 1.34～1.49 times higher than that with aqueous ethanol,and the ratio with inclination angle of 30° is 1.28～1.50.