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冷凝液滴自推进行为的临界触发条件分析

发表时间:2017-10-13  浏览量:1531  下载量:246
全部作者: 褚福强,吴晓敏,朱毅
作者单位: 清华大学热能工程系,热科学与动力工程教育部重点实验室,二氧化碳资源利用与减排技术北京市重点实验室
摘 要: 从液滴本身和冷凝表面两方面建立理论模型,分析影响自推进液滴行为的因素。结果表明,对液滴本身而言,增加合并液滴的数量及粒径比均有利于表面能的释放,促进自推进液滴行为的发生;考虑到黏性耗散/表面能和重力势能/表面能随液滴半径的变化情况,增加液滴的半径首先有利于自推进液滴行为的发生,而后将阻碍自推进液滴行为的发生。对冷凝表面而言,增大表面的静态接触角(contact angle,CA)、降低表面的接触角滞后(contact angle hysteresis,CAH)有利于自推进液滴行为的发生。根据模型计算上述影响因素的临界值,包括临界液滴半径、临界液滴半径比、临界静态接触角和临界接触角滞后等。实际上,这些影响因素是耦合在一起的,如果其中一个因素发生改变,其他因素的临界值也将发生改变。
关 键 词: 表面与界面物理学;冷凝;超疏水表面;自推进液滴行为;影响因素;临界值
Title: Critical trigger conditions analysis for self-propelled droplet behavior during condensation
Author: CHU Fuqiang, WU Xiaomin, ZHU Yi
Organization: Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University
Abstract: In this paper, a theoretical model was developed for influence factors analysis of self-propelled droplet behavior based on both the participant droplets and condensation surface wettability. The results show that the increasing of the coalescent droplet number and droplet radius ratio have advantageous for release of surface energy and promoting the occurrence of self-propelled droplet behaviors as far as droplet is concerned. In consideration of the relationship between droplet radius with viscous dissipation/surface energy and gravitational potential energy/surface energy, the increased droplet radius is good at first and then turn to be bad for the self-propelled droplet behavior. For condensation surface, the increased surface contact angle (CA) and decreased surface contact angle hysteresis (CAH) is beneficial for self-propelled droplet behavior. The critical value of above influence factors are calculated, including critical droplet radius, critical droplet radius ratio, critical surface contact angle and critical contact angle hysteresis. In fact, all the influence factors are coupled, and the critical value of each factor will be influenced by the changes of other factors.
Key words: surface and interface physics; condensation; superhydrophobic; self-propelled droplet behavior; influence factor; critical trigger condition
发表期数: 2017年10月第19期
引用格式: 褚福强,吴晓敏,朱毅. 冷凝液滴自推进行为的临界触发条件分析[J]. 中国科技论文在线精品论文,2017,10(19):2163-2168.
 
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