Jiajia Zhou, Professor, South China University of Technology

Xianmin Xu, Professor

Capillary filling in rectangular channels

10:00-11:00 January 17(Friday), Z305

We analyze the dynamics of liquid filling in a thin, slightly inflated rectangular channel driven by capillary forces. We show that although the amount of liquid in the channel increases in time following the classical Lucas-Washburn law (t1/2 scaling), the prefactor is very sensitive to the deformation of the channel because the filling takes place by the growth of two parts, the bulk part (where the cross section is completely filled by the liquid), and the finger part (where the cross section is partially filled). We calculate the time evolution of bulk and finger accounting for the coupling between the two parts and show that the prefactor for the filling can be reduced significantly by a slight deformation of the rectangular channel, e.g., the prefactor is reduced 50% for a strain of 0.1%. This offers an explanation for the large deviation on the value of the prefactor reported previously.

报告人简介：周嘉嘉， 2002年北京大学物理系本科毕业。2010年加拿大麦克马斯特大学博士，导师An-Chang Shi教授。2011-2015德国美因茨大学博士后，导师Friederike Schmid教授。2015年回国，加入北京航空航天大学化学学院和软物质物理及其应用中心，任副教授。2021年加入华南理工大学前沿软物质学院，任教授，博士生导师。主要从事软物质理论、计算和模拟研究，发展软物质体系的非平衡动力学方法，探索通过调节动态过程来优化高分子和软物质体系的材料性能。近年来在国际期刊Nature, Phys. Rev. Lett.，J. Fluid Mech.上发表论文90余篇，主持国家自然科学基金两项。