报告内容摘要

In this talk, we present a novel multiscale moving contact line theory, which offers a powerful numerical tool for analysis of dynamic wetting, liquid droplet spreading on solid substrates, and various capillary motions. In the proposed multiscale moving contact line theory, we couple molecular scale adhesive interaction i.e. the van der Waals type force and the macroscale fluid mechanics --- that is: we combine a coarse-grained adhesive contact model with a modified Gurtin-Murdoch surface hydroelasto-dynamics theory to formulate the multiscale moving contact line hydrodynamics theory in order to simulate a broader class of colloidal phenomena and their chemomechanical mechanisms, such as cell motility, water spider walking, colloid suspension, and gas bubble in water, etc.

The advantage of adopting the coarse grain adhesive contact model in the moving contact line theory is that it can levitate and separate the liquid droplet with the solid substrate, so that the proposed multiscale moving contact line theory avoids imposing the non-slip condition, and then it removes the subsequent shear stress singularity problem, which allows the surface energy difference and surface stress propelling droplet spreading naturally.

By employing the proposed method, we have successfully simulated droplet spreading over various elastic substrates and droplet durotaxi over the substrates with non-uniform elastic stiffness. The obtained numerical simulation results compare well with the experimental and molecular dynamics results reported in the literature.

报告人简介

Dr. Shaofan Li is currently a full professor of applied and computational mechanics at the University of California-Berkeley. Dr. Li graduated from the Department of Mechanical Engineering at the East China University of Science and Technology (Shanghai, China) with a Bachelor Degree of Science in 1982; he also holds Master Degrees of Science from both the Huazhong University of Science and Technology (Wuhan, China) and the University of Florida (Gainesville, FL, USA) in Applied Mechanics and Aerospace Engineering in 1989 and 1993 respectively.

In 1997, Dr. Li received a PhD degree in Mechanical Engineering from the Northwestern University (Evanston, IL, USA), and he was also a post-doctoral researcher at the Northwestern University during 1997-2000. In 2000, Dr. Li joined the faculty of the Department of Civil and Environmental Engineering at the University of California-Berkeley.

Dr. Shaofan Li has also been a visiting Changjiang Professor in the Huazhong University of Science and Technology, Wuhan, China (2007-2013). Dr. Shaofan Li is the recipient of ICACM Computational Mechanics Award (2013), USACM Fellow Award (2013), A. Richard Newton Research Breakthrough Award (2008), and NSF Career Award (2003). Dr. Li has published more than100 articles in peer-reviewed scientific journals with h-index 38 (Google Scholar), and he is also the author of two research monographs/graduate textbooks.

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