超疏水和超亲水表面对脉动热管性能的影响

Experimental Investigation of the Effects of Superhydrophobic and Superhydrophilic Surfaces on the Pulsating Heat Pipe

本文实验研究了完全超疏水脉动热管和蒸发段为超亲水,冷凝段和绝热段为超疏水的组合表面脉动热管的性能。超疏水表面自由能较低、滞后角小、液滴在表面容易移动。实验发现,与紫铜脉动热管汽液界面呈凹界面不同,超疏水表面汽液界面呈凸界面。组合表面脉动热管汽液界面的长度显著大于完全超疏水脉动热管。与紫铜脉动热管相比,组合脉动热管液弹脉动的振幅增加,而完全超疏水脉动热管蒸发段出现部分烧干,液弹脉动的振幅显著下降。

Effects of superhydrophobic surface and superhydrophobic and superhydrophilic hybrid surface on the fluid flow of PHPs were investigated.The inner surfaces of the PHPs were hydrophilic surface（copper）,hybrid surface（superhydrophilic evaporation and superhydrophobic condensation section）,and uniform superhydrophobic surface,respectively.Visualization results showed that the liquid-vapor interface was concave in the copper PHP.On the contrary,the liquid-vapor interface took a convex profile in the PHP with superhydrophobic surface and the liquid-vapor interface length in the hybrid surface PHP was higher than that in the uniform superhydrophobic surface PHP.The partial dryout phenomenon took place in PHPs with uniform superhydrophobic surface and the liquid slug movements became weaker.