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题目:Microscale thin film stability and dynamics

报告人:李二强,中国科技大学教授,“青千”

主持人:臧渡洋

报告时间:2017年6月19日(周一)

上午10:00-11:00

报告地点:理学院383

报告摘要:

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 at5 million frames per secondto 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.

主讲人简介:

李二强于2011年在新加坡国立大学获得博士学位。之后在沙特阿拉伯的阿卜杜拉国王科技大学的高速流体摄影实验室做博士后和研究员。2016年,入选国家“青年千人”计划,并被中国科学技术大学近代力学系聘为教授。他的主要研究方向是液滴气泡动力学、表界面流和微流体。

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