液滴与球形颗粒相互碰撞的数值模拟  

Numerical simulation of a droplet colliding with a spherical particle

作　　者：杜敏[1] 宋亮 孙文涛 王跃成 DU Min;SONG Liang;SUN Wentao;WANG Yuecheng(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2021年第3期284-290,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51306075);江苏省自然科学基金资助项目(BK20130520)。

摘　　要：为了研究液滴与球形颗粒的碰撞规律,建立了正确反映液滴与颗粒间相互碰撞的物理模型.利用所建模型模拟了液滴与颗粒的动态碰撞过程,进而对液滴半径铺展系数及液膜中心高度系数进行分析,研究了液滴与颗粒间的撞击速度、湿润角、粒径比等参数对碰撞结果的影响.结果表明:在一定条件下,撞击速度的提高会增大液滴的最大铺展半径系数,当撞击速度为0.4 m·s^(-1)时,液滴完全反弹,当撞击速度提高到1.4 m·s^(-1)时,液滴发生破碎;当速度和粒径比不变时,湿润角与最大液膜中心高度系数成正比;在湿润角不大于90°时,粒径比越大,液滴包覆的概率就越大.To investigate the rules of collision between a droplet and a spherical particle,a physical model was established to reflect the collision.The model was used to simulate the dynamic collision process,and the droplet radius spreading coefficient and the liquid film center height coefficient were also investigated.The effects of parameters of impact velocity,wetting angle and size ratio of droplet to particle on the collision were analyzed.The results show that within the scope of this paper,the increasing of impact velocity can increase the maximum radius spreading coefficient.When the impact velocity is 0.4 m·s^(-1),the droplets rebound completely.When the impact velocity is increased to 1.4 m·s^(-1),the droplets are broken.When the impact speed and the size ratio of droplet to particle are constant,the wetting angle is proportional to the maximum liquid film center height coefficient.When the wetting angle is less than 90°,with the increasing of size ratio of droplet to particle,the probability of droplet coating is increased.

关 键 词：液滴 球形颗粒 碰撞规律 铺展系数 液膜中心高度系数 

分 类 号：O359[理学—流体力学]