A Study on Dynamic Wetting Behavior

实验测量了毛细管流、二维弯月面和轴对称液滴中三相接触线速度对动态接触角的影响。结果表明，接触角不依赖于接触线曲率，也不能简单地由毛细管数来确定。结果表明，表面粗糙度或杂质等壁面缺陷对动态润湿行为有很大影响，通过数值模拟研究了接触线通过润湿性较好缺陷的行为。接触线变形功随着速度的增加而增大。从系统能量平衡的角度考虑，变形功对动接触角有重要影响。

The dynamic contact angle dependent on the velocity of three-phase contact line were experimentally measured in capillary flow, 2D meniscus and axi-symmetric droplet. The results showed that the contact angle is not dependent on the contact line curvature, and cannot be simply arranged by Capillary number. It is suggested that wall defects such as roughness or impurities have a strong influence on the dynamic wetting behavior.A numerical simulation was performed to investigate the behavior of contact line passing over a defect with better wettability. The work of contact line deformation increases with the velocity. From the consideration of system energy equilibrium, the work of deformation should have an important role on the dynamic contact angle.