单液滴撞击倾斜液膜飞溅过程的耦合Level Set-VOF模拟  

A coupled level-set and volume-of-fluid simulation for splashing of single droplet impact on an inclined liquid film

作　　者：戴剑锋[1] 樊学萍[1] 蒙波[1] 刘骥飞[1] 

机构地区：[1]兰州理工大学理学院,兰州730050

出　　处：《物理学报》2015年第9期406-411,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50873047)资助的课题~~

摘　　要：采用耦合水平集——体积分数法(CLSVOF)对液滴撞击倾斜表面液膜后液膜的形态演化及飞溅过程进行数值模拟,并对液滴撞击液膜过程中形成的空气卷吸现象进行研究并探讨了撞击角对此的影响,分析了液滴撞击后液体内部的压力和速度分布,对液滴撞击倾斜表面液膜的飞溅过程进行讨论,并与实验结果进行了对比,验证了CLSVOF方法研究液滴撞击倾斜液膜的可行性.结果表明,液滴撞击倾斜液膜时前后两部分飞溅现象产生的机理不同,前半部分飞溅是由于压差引起的颈部射流,而后半部分则是由液膜径向流动产生的飞溅现象.随着撞击角的增大,空气卷吸气泡数量减少.A coupled level set and volume of fluid （CLSVOF） method is utilized to simulate the droplet evolution, during splashing after impacting on an inclined liquid film, and the bubble entrainment by the droplet impacting of the liquid. The influence of impact angles of bubble entrainment, the processes of splashing pressure field and velocity field after impingement are studied and discussed. Compared with the results obtained by experiment, the validity of CLSVOF method is verifiled by simulating the droplet splashing on an inclined liquid film. Results indicate that the mechanisms of front and back splashing are different. The front splashing is caused by pressure dii^erence in the neck region, and the back splashing is produced by radial flow in the liquid film. It is also found that along with the impact angle moving towards the large angle direction, the bubble entrainment number shows a reducing trend.

关 键 词：液滴撞击 倾斜液膜 CLSVOF 空气卷吸 

分 类 号：O35[理学—流体力学]