中文摘要：

应用基于VOF的界面跟踪方法分析了单液滴碰撞不同尺寸等温固体壁面时铺展、回缩或延伸至壁外形成液膜、液膜破碎等过程的动力学行为.通过与文献中液滴在壁面上铺展直径随时间变化的试验对比,证实了模型的可靠性.通过改变We数、Re数及壁面宽度,考查了初始液滴碰撞动能、表面能及固体壁面尺度对液滴碰壁现象的影响,计算结果表明：当壁面宽度较小,液滴初始动能较大时,油膜铺展至壁面之外,形成空间液膜,并进而发生飞溅破碎;液滴初始动能越大,则破碎的液滴数量越多,尺寸越小;空间液膜的运动方向与初始动能及壁面尺度有关,初始动能越大,壁面尺度越小,则空间液膜向表面后方运动的轴向速度分量越大,分布越广.

英文摘要：

Based on the finite volume solution of Navier-Stokes equations coupled with volume of fluid method（VOF）,the impingement process of a droplet impacting normally onto a non-heated surface was numerically simulated.The model was validated by comparison with available experimental data for the temporal development of the spreading diameter for the impinging droplet.The effects of We,Re,L and the ratio of surface size to initial droplet diameter on the droplet deformation,the film formation and break up behavior were investigated.Calculated results show that with small wall size and large initial droplet kinetic energy,the liquid film spreads and splashes over the wall edge to form a number of secondary droplets.With the increasing of initial droplet impact energy,the splashing trend becomes violent with smaller size of secondary droplets,while secondary droplets number becomes larger with more extensive spacial distribution.