香港中文大学徐磊教授线上学术报告

The Role of Drop Shape in Impact and Splash

主讲人 : Prof. Xu Lei’s Bio.

The impact and splash of liquid drops on solid substrates are ubiquitous in many important fields. However, previous studies have mainly focused on spherical drops while the non-spherical situations, such as raindrops, charged drops, oscillating drops, and drops affected by electromagnetic field, remain largely unexplored. Using ferrofluid, we realize various drop shapes and illustrate the fundamental role of shape in impact and splash. Experiments show that different drop shapes produce large variations in spreading dynamics, splash onset, and splash amount. However, underlying all these variations we discover universal mechanisms across various drop shapes: the impact dynamics is governed by the superellipse model, the splash onset is triggered by the Kelvin-Helmholtz instability, and the amount of splash is determined by the energy dissipation before liquid taking off. Our study generalizes the drop impact research beyond the spherical geometry, and reveals the potential of using drop shape to control impact and splash.

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主讲人简介：

香港中文大学物理系教授，主要致力于通过实验手段探索流体或复杂流体的物理机制，包括液滴飞溅原理、干燥动力学、液滴聚并及结冰等过程。相关研究成果发表于Nature Physics，Nature Materials, Physical Review Letters, PNAS, Journal of Fluid Mechanics等学科领域顶尖期刊。曾获中国教育部 2014 年度高等学校科学研究优秀成果奖（自然科学家二等奖）、第九届国际光流体交叉学科大会青年科学家奖等数项荣誉。

具体履历如下：

· Professor, Department of Physics, The Chinese University of Hong Kong （香港中文大学教授）

· Postdoctoral Fellow, School of Engineering and Applied Sciences, Harvard University （哈佛大学工程与应用科学学院博士后）, 2006-2009

· PhD, Department of Physics, The University of Chicago (芝加哥大学物理系博士), 2000-2006

· BS, Department of Physics, USTC (中国科技大学物理系学士), 1995-2000