Experimental Research of Drop Impact on Lyophobic Surfaces

Abstract

本文首先通过系统实验研究了不同粘性液滴以不同速度撞击疏液表面上的撞击现象及过程，揭示了液滴粘度、撞击速度对液滴铺展、回缩、回弹以及飞溅等实验现象的影响，并给予相应的机理解释。其次，基于实验结果，本文定性地探讨了液滴的最大铺展系数(βmax)与撞击速度和液滴粘度之间的关系，研究发现βmax随撞击速度的增加而增大，随液体粘度的增加而减小。 Firstly in this paper, we experimentally studied the dynamic processes of different viscous droplets impacting on the lyophobic surfaces at different velocities. Various impact phenomena, including spreading, retraction, rebound, and splashing, are influenced by the impact velocity and liquid vis-cosity. Secondly, we explored the relationships between the maximum spreading factor (βmax), im-pact bvelocity and the viscosity of liquid drops qualitatively. It was found that βmax increases with impact velocity, but decreases with liquid viscosity.