液滴冲击液面过程中变形特征的实验研究  

Experimental study of deformation characteristics during the process of liquid drop impact liquid surface

作　　者：马慧敏 刘长根[1] 李旭 房河宇 董娇娇 MA Hui-min;LIU Chang-gen;LI Xu;FANG He-yu;DONG Jiao-jiao(Department of Mechanics, Tianjin University, Tianjin 300350, China)

机构地区：[1]天津大学力学系

出　　处：《实验力学》2019年第4期600-608,共9页Journal of Experimental Mechanics

基　　金：国家重点研发计划,课题编号:2018YFD0900704

摘　　要：用高速相机拍摄了液滴以不同速度冲击液面的运动过程,测量了冲击过程中典型时刻液坑、中心液柱、次生液滴和次生液柱的几何尺寸,对这些几何尺寸的最大值与韦伯数(We)的关系进行了回归分析,结果表明:空间上,液坑的最大垂直深度、液坑的最大水平长度、中心液柱的最大高度、次生液滴等效直径和次生液柱的最大高度随We数增加呈线性增加;次生液滴等效直径是初始液滴等效直径的1.2~2倍;当200<We<220时,次生液滴冲击液面没有次生液柱生成,当360<We<713时,有次生液柱形成,220≤We≤360为过渡区;时间上,We数越大,运动过程中液坑的大小和中心液柱的高度变化越快,液坑和中心液柱持续时间越长,中心液柱达到最大高度的时刻以及破碎生成次生液滴的时刻也越晚。The motion process of liquid drop impact liquid surface at different velocities was photographed by a high-speed camera. Geometric dimensions including the crater, central liquid column, secondary droplet and the secondary liquid column were measured at typical moments during the impact. The regression analysis of relationship between the maximum value of these geometric dimensions and Weber number (We) was carried out. Results show that in space, the maximum vertical depth of liquid crater, the maximum horizontal length of liquid crater, the maximum height of central liquid column, the equivalent diameter of the secondary droplet, and the maximum height of the secondary liquid column increase linearly with the increase of Weber number. The equivalent diameter of the secondary droplets are larger than the equivalent diameter of the initial liquid drop by 1. 2 2 times. When 200VWeV220, the secondary liquid droplets does not produce secondary liquid column at the impact level, and when 360<CWe<713, the secondary liquid column is produced, so (220WW^W360) is a transition zone. The greater Weber number is, the faster the size of the crater and the height of central column in impact process, the longer the duration of the crater and the central column, the later the moment of the central column reaches its maximum height and the moment of the secondary droplet is produced when the central column breaks up.

关 键 词：液滴 冲击 次生液滴 次生液柱 

分 类 号：O351.2[理学—流体力学] O353.5[理学—力学]