液滴撞击超疏水冷表面的反弹/黏附特性对比研究

Comparative study on rebound/adhesion characteristics of droplets impacting superhydrophobic cold surface

为研究液滴撞击超疏水冷表面动力学现象,通过开展去离子水液滴撞击CuO超疏水表面实验,研究表面温度对液滴碰撞后响应方式的影响,分析铺展直径与反弹高度变化规律。结果表明:液滴撞击超疏水冷表面出现反弹与黏附2种响应方式,临界表面温度介于-25℃~-20℃之间;液滴反弹工况下,表面温度越低,液滴与超疏水冷表面之间接触时间越长,液滴最大反弹高度越小;液滴黏附工况下,随表面温度降低,液滴回缩程度减小,稳定铺展直径增大。研究结果可为表面结冰界面现象与防冰/除冰机理研究提供参考。

In order to investigate the dynamic behaviors of droplet impacting the superhydrophobic cold surface,the experimental study of deionized water droplet impacting the superhydrophobic CuO surface was performed.The effect of surface temperature on the response mode after the droplet impacting was analyzed,and the change laws of spreading diameter and rebound height were studied.The results showed that the droplet would appear two response modes of rebound and adhesion after impacting the superhydrophobic cold surface,and the critical surface temperature was between-25℃and-20℃.Under the conditions of droplet rebound,the lower the surface temperature,the longer the contact time between droplet and superhydrophobic cold surface,and the smaller the largest rebound height of droplet.Under the conditions of droplet adhesion,with the decrease of surface temperature,the retraction extent of droplet decreased,and the stable spreading diameter increased.The results can provide reference for the study of surface icing interface phenomenon and anti-icing/deicing mechanism.