超疏水铝导线防覆冰机理研究

Investigation on Anti-icing Mechanism of Super-hydrophobic Aluminum Wire

近年来,超疏水表面在电力系统防覆冰方面的应用受到了广泛关注,为了对超疏水铝导线的防覆冰机理和防覆冰效果进行研究,制备了超疏水铝导线和普通铝导线,利用实验室搭建的覆冰实验平台对其覆冰过程进行了记录和分析。研究结果表明液滴在超疏水铝导线表面汇聚后可能发生自跳跃现象,使用界面自由能理论并结合能量守恒的观点对此进行了分析,认为液滴自跳跃过程有利于液滴滚落,延缓覆冰。此外,还对单个液滴在两种铝导线表面的结冰过程进行了研究,发现液滴在超疏水铝导线表面特殊的接触状态延缓了液滴在其表面的结冰时间,并且这种延缓效果主要体现在液滴发生相变之前。液滴在超疏水铝导线表面直接滚落,自跳跃滚落以及缓慢结冰使得超疏水铝导线在-5℃时拥有良好的防覆冰效果,实验结果对超疏水铝导线防覆冰理论的发展具有重要作用。

In recent years, the application of superhydrophobic surface in anti-icing of power system has attracted much attention. The super-hydrophobic aluminum wire and polished aluminum wire were fabricated to investigate the anti-icing mechanism and the anti-icing performance of superhydrophobic surface. The icing processes of two kinds of wires were recorded and analyzed using the icing experiment platform built in laboratory. The result shows that the self-propelled jumping of coalesced droplets may happen on the surface of super-hydrophobic aluminum wire, which is contributed to the rolling of water droplet and delaying of icing. In addition, the static icing processes of single water droplet on two kinds of aluminum wire were investigated. Due to the special contact condition between water droplet and super-hydrophobic aluminum wire surface, the icing processes are delayed especially in the initial phase transformation of water droplet. At the temperature of-5℃, super-hydrophobic aluminum wire shows excellent anti-icing performance as the results of direct rolling, self-propelled jumping and delayed icing of water droplet on its surface. The experimental results have an important role in the development of anti-icing theory of super-hydrophobic aluminum wire.