一种新型微热管传热性能的实验研究

An Experimental Study of the Heat Transfer Performance of Innovative Micro HeatPipes

对一种新型的平板式微热管-零切角曲面微热管进行了实验研究。以热阻为基础,研究不同倾角、工质、充液比下微热管的热性能。为便于分析,将热管总热阻分解为4个部分:加热热阻、蒸发段热阻、冷凝段热阻和热沉热阻。通过实验得出如下结论:微热管总热阻的主要变化因素是冷凝段热阻和蒸发段热阻;与相应的无工质平板式换热器相比,实验件主要热阻变为热沉热阻,蒸发段和冷凝段热阻所占比例较低。根据不同的充液比和倾角,微热管传热极限分别由局部干烧和核态沸腾向膜态沸腾转化引起。实验表明,这种新型的微热管具有良好的应用前景,但是对于其机理还需要更深入的研究。

An experimental study is conducted of a new type of flat-plate micro heat pipes featuring a zero-chamfer curved surface.Based on heat resistance,the thermodynamic performance of micro heat pipes is studied under such conditions as different inclination angles,working media and liquid-filling ratios.To facilitate its analysis,the total heat transfer resistance of the heat pipes is divided into four items: heating heat-transfer resistance,heat-transfer resistance of evaporation section,heat-transfer resistance of condensation section and heat-sink heat-transfer resistance.The following conclusions have been arrived at through tests: the factors that cause the main change in the total heat-transfer resistance of the micro heat pipes are the heat-transfer resistance of both the condensation section and the evaporation one.Compared with corresponding flat-plate type heat exchangers without working media,the main heat-transfer resistance of a test piece becomes the heat sink one.The heat-transfer resistance in both the evaporation section and the condensation section accounts for a relatively small proportion.According to different liquid filling ratios and inclination angles,the heat transfer limit of a micro heat pipe will be caused respectively by local dry burning and a transition from nuclear boiling to film boiling.The experiments show that this new type of micro heat pipe has bright application prospects,but an in-depth study of its operating mechanism is still needed.