疏水表面上液滴滞后阻力的实验研究

Experimental study of droplet hysteresis resistance on the hydrophobic surface

水滴在接触物体表面上的移动过程所表现出的阻力特性与固体滑块之间发生相对位移时产生的摩擦阻力具有明显的差异。为了进一步揭示这一特性,本文动态测量了水滴在聚二甲基硅氧烷(PDMS)疏水表面上的移动过程,给出了定量解释。结果表明:在不同材料表面上水滴移动的动态特性并不相同,液滴在聚二甲基硅氧烷表面上移动的滞后阻力主要受铺展功到影响。

The resistance characteristic of a moving water droplet on a contact surface is different to that of two solids with relative displacement.To further reveal the above characteristic of a moving water droplet on a solid surface,the moving process of a water droplet on the polydimethylsiloxane(PDMS) hydrophobic surface was experimentally examined and quantitative interpreted.The results showed that the water droplet have different dynamic characteristic on different solid surface.The hysteresis resistance of a water droplet moving on the PEMS surface is mainly affected by spreading work.