188比分直播,188篮球即时比分直播

基础论坛【第211期-姜又华】


主题:多尺度固液相互作用:从气溶胶的收集到液体传输

主讲人:姜又华 助理教授

时间:2020年11月17日 上午10:00

地点:沙河校区通信楼818会议室

主讲人简介:

姜又华博士,助理教授

广东以色列理工学院机械系,汕头,中国

报告摘要:

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 fogcapturing(i.e. fluid dynamics) as well asliquid 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.

目前,水资源的缺乏威胁着饮水与工业用水。从雾气中收集水是解决水短缺的一个很有前景的方式。水收集由两步组成,一是用固体表面从雾中抓取以蒸汽或气溶胶形态存在的水,二是把抓取到的水定向运输到储存处。这两步涉及到多个学科的知识,包括流体力学,胶体与界面,表面工程,及传热传质等。因此,目前定量研究水收集的工作不多。在介绍了水收集的大背景之后,该报告将从流体力学与表界面力学入手,分析水雾收集及水传输。在超亲水表面上,该报告将介绍一个可以在0.1秒内让水在金属线上传输速度加快3倍的机理。在疏水表面上,该报告将重点阐述液滴的粘附及运动机理,包括表面润湿性与微结构的影响。最后,姜博士将简短地介绍未来的科研方向及计划。