学　术

　　主　题：Multiscale droplet-surface interaction: From airborne droplet capture to liquid transport

　　主讲人：Youhua Jiang，Assistant Professor　Department of Mechanical Engineering

Guangdong Technion – Israel Institute of Technology (GTIIT), China.

　　时　间：2020年11月18日（周三）10：30

　　地　点：清水河校区物理学院506B

　　主持人：陈龙泉　教授

　　内容简介：

　　Currently, a lack of sustainably sourced water threatens the future supply for drinking and energy processing. Finding alternative ways to collect water are vital and collecting airborne water droplets from fog-laden wind is a promising approach. Fog collection essentially is comprised of two steps, capturing the airborne liquid droplets, and directionally transporting the liquid to a collecting reservoir. These two components are governed by different areas of knowledge, therefore, designing effective water collection devices involves coupling various parameters in fluid dynamics, interface science, surface engineering, and heat and mass transfer. To date, quantitative studies that address such coupling are rare. In this talk, background and current challenges of fog collection will be introduced. Dr. Jiang’s work on fog collection from the perspective of fog capturing (i.e. fluid dynamics) as well as liquid transport (i.e. interfacial phenomena) will then be discussed. Following that, a newly discovered mechanism of liquid transport that accelerates droplets three-fold within 0.1 seconds on completely wetted, cylindrical wires will be elaborated. On partially wetted surfaces, how the liquid transport can be controlled by surface characteristics, e.g., wettability, topology, and dimensions of microstructures, will be detailed. Lastly, a brief overview of future research directions will be introduced.

　　主讲人简介：

　　Prof. Jiang received his M.S. and Ph.D. degrees in Mechanical Engineering from the Stevens Institute of Technology in 2014 and 2018, respectively, followed by the Postdoctoral Training in the Department of Mechanical Engineering at Northwestern University. He joined the Mechanical Engineering Department at Guangdong Technion – Israel Institute of Technology (GTIIT) as the Assistant Professor beginning from 2020.

　　His research focuses on interfacial flows, including drops and bubbles, combining the fastest high-speed cameras together with large parallel numerical simulations. His research has been published in top journals such as Physical Review Letters, Journal of Fluid Mechanics, Physical Review E and Chemical Engineering Journal. His results have been highlighted in three cover images of Journal of Fluid Mechanics and have recently received the 2018 Best Scientific Award of the Photron Slow Motion Video Award. He is currently in charge of two research funds from the National Natural Science Foundation of China (NSFC) supporting his research.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　物理学院

　　　　　　　　　　　　　　　　　　　　　　　　　　2020年11月13日