具有近壁效应的超疏水表面上液滴聚并自弹跳特性的数值模拟研究
Numerical Study of Coalescence-induced Self-propelled Droplet Jumping on Superhydrophobic Surfaces With Near-wall Effect
王宇航 1李奇林 1王文辉 2明平剑3
作者信息
- 1. 哈尔滨理工大学机械动力工程学院,哈尔滨 150080
- 2. 太原航空仪表有限公司,太原 030006
- 3. 中山大学中法核工程与技术学院,珠海 519082
- 折叠
摘要
超疏水表面上微尺度液滴在聚并后可以自发跳起,这一特性在工程领域具有巨大的应用价值.液滴聚并时膨胀的液桥撞击超疏水表面,表面可以提供一个反向作用力促使液滴跳离表面.但液滴聚并后的自发跳起具有一定程度的不可控性.因此,本文采用改进的VOF方法研究了具有近壁效应的超疏水表面上液滴的自弹跳特性,该特殊结构可以改变液滴的液桥动力学特性以及加强液桥和表面的碰撞,从而提高其自弹跳速度.利用近壁结构和水平面基底之间不同的润湿性还能进一步调控液滴的自弹跳方向.
Abstract
Micro-scale droplets on superhydrophobic surfaces can spontaneously jumping after co-alescence during condensation,which has enormous engineering applications.The expanding liquid bridge during coalescence can impact the superhydrophobic surface,and the surface provides a re-action to force the droplet to jump.However,the spontaneous droplet jumping is uncontrollable,to a certain extent.Therefore,in this paper,an improved Volume-of-fluid(VOF)method is utilized to study the coalescence-induced self-propelled jumping dynamics of droplet on superhydrophobic surfaces with near-wall effect.The near-wall structure can change the liquid bridge dynamics and enhance the collision between the liquid bridge and the surface,leading to an increase in jump-ing velocity.The difference of surface wettability between the vertical near-wall structure and the horizontal substrate can further regulate the jumping direction.
关键词
VOF法/聚并自弹跳/超疏水表面/近壁效应/表面润湿性Key words
VOF method/coalescence-induced self-propelled jumping/superhydrophobic surface/near-wall effect/surface wettability引用本文复制引用
基金项目
黑龙江省普通高校基本科研业务费专项资金资助(2022-KYYWF-0143)
出版年
2024
NETL
NSTL
万方数据