摘要
采用CLSVOF方法建立了液滴撞击微尺度矩形沟槽表面的三维数值模型,对撞击过程中的动态特性及传热特性进行了数值研究。分析了液滴在微尺度矩形沟槽表面的润湿状态,给出了液滴润湿状态转变的临界速度。研究了表面接触角及撞击速度对液滴铺展特性的影响。数值研究结果表明:微尺度沟梢结构会使液滴在撞击后产生横纵差异。液滴的最大铺展因子随着撞击表面接触角的增大而减小,随着撞击速度的增大而增大。液滴撞击微尺度矩形沟槽表面后,撞击表面的热流量先增大后减小。撞击表面的最大热流量受到表面接触角与沟槽深度的耦合作用,撞击表面的最大热流量随着表面接触角的增大而减小。
A three-dimensional numerical model of the droplet impact on micro-scale rectangulargroove surface is established on the basis of CLSVOF method. Dynamic characteristics and heat transfer characteristics of droplet impact are numerically studied. The wettability state of droplet on micro-scale rectangular-groove surface is analyzed, and the critical velocity is proposed. The effects of surface contact angle and impact velocity on the droplet spreading characteristics are investigated.The numerical results show that the difference between vertical direction and parallel direction of droplet impact is caused by micro-scale groove structure. The maximum spreading factor decreases with increasing surface contact angle, and it increases with increasing impact velocity. During the process of droplet impact, the heat transfer rate of impact surface increases first and then decreases.The maximum heat transfer rate of impact surface is a coupling effect of contact angle and groove depth, and it decreases with increasing surface contact angle.
作者
闫哲
李艳
袁瀚
梅宁
YAN Zhe;LI Yan;YUAN Han;MEI Ning(College of Engineering, Ocean University of China, Qingdao 266100, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第7期1542-1548,共7页
Journal of Engineering Thermophysics
基金
山东省重点研发计划资助项目(No.2017GHY15113)
国家自然科学基金资助项目(No.51376164)
广东省自然科学基金资助项目(No.ZR2017BEE011)
关键词
液滴撞击
矩形沟槽
数值模拟
润湿
传热
droplet impact
rectangular groove
numerical simulation
wettability
heat transfer
