摘要：We study the time averaging of the apparent advancing and receding contact angles on surfaces with periodic chemical patterns. We first derive a Cox-type boundary condition for the apparent dynamic contact angle on homogeneous surfaces using Onsager Variational principle. Based on this condition, we derive a reduced model for moving contact line problems on chemically inhomogeneous surfaces by multiscale expansion and averaging techniques. We obtain a quantitative formula for the averaged dynamic contact angles. It gives explicitly how the advancing and receding contact angles depend on the velocity and the chemical inhomogeneity of the substrate. Numerical simulations are presented to validate the analytical results.

报告人简历：张振，南方科技大学副教授 张振，南方科技大学副教授 ，国家级青年人才计划入选者 ， 从事多相流接触线问题的模型和算法 。

邀请人：杜锐