撞击液滴形成的液膜边缘特性  

Characteristic of Liquid Film Formed during Process of Droplet Impinging on Surface

作　　者：崔洁[1] 陈雪莉[1] 王辅臣[1] 龚欣[1] 

机构地区：[1]华东理工大学煤气化教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2009年第6期819-824,共6页Journal of East China University of Science and Technology

基　　金：国家重点基础研究发展计划(973计划)(2004CB217707);国家高技术研究发展计划(863计划)(2006AA05A101;2007AA050301)

摘　　要：以旋风分离器内液滴撞击筒壁为研究背景,探讨了撞击形成的液膜边缘特性,考察了韦伯数（We）、撞击速度、初始液滴直径对液膜边缘形成的指形液滴和卫星液滴的影响。结果发现：不同We数下,最大液膜直径形成的指形液滴体积分布集中在0.2-0.6,近似于高斯分布 随着We数的增加,大体积卫星液滴出现的几率也随之增大 且卫星液滴的体积随着初始液滴直径和初始撞击速度的增大而增大 另外,在同一铺展过程中,边缘液滴、指形液滴和卫星液滴三者的数量呈依次递减的关系。The characteristic of liquid film formed during the process of the droplet impinging on the surface was investigated using a high-speed camera on the background of droplet movement in the cyclone-type separator.The influence of the We,impact velocity and diameter of the droplet on the satellite droplets and finger droplets was discussed,respectively.When the spreading diameter reaches to the maximum,volume rate of the finger droplets distributes from 0.2 to 0.6,which is close to Gauss distribution.The volume percentage of the larger satellite droplets increases with We.And the volume of the satellite droplets increases with the initial droplet diameter and the impact velocity.In addition,the number of the edge droplets,finger droplets and the satellite droplets decreases in sequence at a certain spreading process.

关 键 词：液滴撞击 边缘液滴 指形液滴 卫星液滴 高速摄像 

分 类 号：O353.4[理学—流体力学]