小型平板热管的传热特性

以丙酮、乙醇和水为工质,对小型平板热管在充液率为20%~90%的传热性能进行了实验研究。测量了热管蒸发段和冷凝段管壁、加热和冷却风道进、出口截面等处的温度分布,计算了传热量和传热系数。根据实验结果总结出了工质、充液量和热流密度对热管传热系数的影响。得出该平板热管以乙醇为工质的传热性能最好,传热极限qmax为16~17 kW/m2,最佳充液率为50%,并给出平均传热系数综合关联式。实验结果可供工程设计参考。

Heat transfer characteristics of mini flat heat pipe

The heat transfer characteristics of mini flat heat pipes with acetone, ethanol and water as the working fluid and their filling rate 20%- 90% were studied. The wall temperatures of the vaporization and condensation sections of the heat pipe and the air temperatures at the inlet and outlet of the heating and cooling air ducts were measured. The effects of the different working heat transfer capability and the heat transfer coefficient were calculated. The fluids and their filling rates, and the density of the heat flux on the heat transfer coefficient of the heat pipe were summarized from the experiment results. It was found that the flat heat pipe demonstrates the best performance when ethanol is used as its working fluid, its heat transfer limit is qmax = 16 - 17 kW/m^2 with the optimal filling rate of 50%. A comprehensive empirical correlation for the average heat transfer coefficient of the studied heat pipe was derived from the experiments. The achieved results are referential for the engineering design of the mini flat heat pipes.