Date: June 16，10:30-11:30am

Venue: Room 29 at Quan Zhai, BICMR

Speaker: Prof. Weiqing Ren, Department of Mathematics, National University of Singapore

Abstract: I will first discuss a continuum model for moving contact lines in multi-phase flow. The model is derived from principles of non-equilibrium thermodynamics and molecular dynamics simulations. It consists of the Navier-Stokes equation, a boundary condition for the slip velocity, and a relation between the dynamic contact angle and the contact line velocity. We use the continuum model to study the contact angle hysteresis on a chemically patterned surface, and contact line dynamics in the presence of insoluble surfactants. In the second part of my talk, I will talk about wetting transitions and liquid condensations on patterned solid surfaces.