关键词: 热工学, 小型平板热管, 工质, 充液率, 传热特性

Abstract: 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 heat transfer capability and the heat transfer coefficient were calculated. The effects of the different working 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/m2 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.

Key words: pyrology, mini flat heat pipe, working fluid, filling rate, heat transfer characteristics