Microscale thin film stability and dynamics

讲座名称: Microscale thin film stability and dynamics
讲座时间 2017-06-15
讲座地点 航天航空学院教一楼第二会议室
讲座人 李二强
应航天航空学院Marie-Jean Thoraval教授邀请,中国科学技术大学“青年千人”李二强教授将来访我校并作学术报告。
报告题目:Microscale thin film stability and dynamics
Interfacial flows exist widely in nature and industrial processes, and often involve thin film constructions. Here we represent two experimental realizations in which high-speed video imaging technique is used to accurately measure film profiles, for investigating dominant forces that governing thin film stability, and the fluid dynamics in film evolution. In the first example the stability of a thin film trapped between a rising bubble and a liquid-liquid meniscus interface is studied, to demonstrate the validity of using surface forces to predict film stability, with an emphasis that a short-ranged hydrophobic attraction determines the stability of thin water films. In the second system drop impact onto a solid surface is considered. Owing to viscous lubrication pressure in the intervening air layer, the first contact does not occur at a point but along a ring, leading to the entrapment of a small bubble under drop center. We use high-speed interferometry at 5 million frames per second to reveal the details of this process, including air disc size at first contact, air compression dynamics, as well as the liquid-solid contact mechanism. The effects of surface roughness on the first impact are also investigated.

Dr. Erqiang Li obtained his PhD from National University of Singapore (NUS) in 2011. He then worked as a postdoc and later a research scientist at the High-Speed Fluids Imaging Laboratory at King Abdullah University of Science and Technology (KAUST), in Saudi Arabia. In 2016 he received the national “Thousand Young Talent Plan” (“青年千人”计划) and joined the University of Science and Technology of China (USTC), as a Professor at the Department of Modern Mechanics. His research interests include drop/bubble dynamics, interfacial flows and microfluidics.

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