粘性力和表面张力对液滴撞击超疏水管壁动力学特性的影响研究  

RESEARCH ON EFFECT OF VISCOSITY FORCE AND SURFACE TENSION ON DYNAMIC CHARACTERISTICS OF DROPLET IMPACT ON SUPER-HYDROPHOBIC TUBE

作　　者：刘晓华[1] 赵一鸣 王开珉 陈石[1] 沈胜强[1] Liu Xiaohua;Zhao Yiming;Wang Kaimin;Chen Shi;Shen Shengqiang(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]海洋能源与节能教育部重点实验室,大连理工大学能源与动力学院,大连116024

出　　处：《太阳能学报》2020年第10期1-7,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51476017;51476016);国家自然科学基金重点基金(51336001);国家科技支撑计划(2014BAB09B00)

摘　　要：利用相界面追踪的耦合水平集-流体体积(CLSVOF)方法,对液滴撞击超疏水管状壁面的动态特性展开研究,主要讨论粘性系数和表面张力系数对撞击过程的影响。研究结果表明:液滴粘性系数越小,液膜的铺展速度越快,回缩速度也越快,同时越早发生反弹,反弹高度也越大;随着表面张力系数的增大,液膜达到最大铺展所需时间减少,会阻碍液膜的铺展,但会促进其回缩,当表面张力系数为0.01 N/m时,液膜外边缘出现飞溅且液膜主体不发生反弹;还对液滴撞击超疏水管壁后出现的反弹、飞溅现象的机理展开分析。The method of Coupled Level Set and Volume of Fluid of phase interface tracking is used to investigate the dynamic characteristics of the droplet impact on a super-hydrophobic tube. The effects of viscosity coefficient and surface tension coefficient on the impact process are discussed. It is found that,the maximum dimensionless spreading diameter of the droplet decreases with the viscosity coefficient. The smaller the viscosity coefficient is,the faster the spread and retraction is,the earlier and higher the rebound is. With the increase of the surface tension coefficient,the time to reach the maximum dimensionless spreading diameter reduces. The larger the surface tension coefficient is,the more difficult the liquid film spread is,the faster the liquid film retraction is. When the surface tension coefficient is 0.01 N/m,the splash takes place at the rim of the liquid film and no rebound occurs. The mechanism of the rebound and splash phenomena after the droplet impact is analyzed.

关 键 词：润湿性 液体粘度 表面张力 流体动力学 液滴撞击 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]