液滴撞击固体球面行为特性的数值研究  

Numerical simulation for behavior of a droplet impacting onto a target spherical surface

作　　者：汪焰恩[1] 周金华[1,2] 秦琰磊[1,2] 李鹏林[1,2] 杨明明[1,2] 韩琴[1,2] 王月波[1,2] 魏生民[1,2] 

机构地区：[1]西北工业大学机电学院,西安710072 [2]西北工业大学现代设计与集成制造技术教育部重点实验室,西安710072

出　　处：《振动与冲击》2012年第20期51-55,176,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51175432;50905147;50875215);西北工业大学研究生创业种子基金资助(Z2011.085);陕西省自然科学基金(2011JQ7005);中国博士后科学研究基金(200902606;2008044193);西北工业大学新人新方向(10GH0133);西北工业大学基础研究基金(JC20100230)

摘　　要：基于VOF理论,建立单个液滴撞击球面基板的模型,并分析液滴的运动、射流、弛豫和平衡四个阶段的形态变化。对液滴正向撞击球面的过程进行数值模拟,重点研究冲击速度、球面直径、表面张力和粘度对液滴沉积行为的影响。结果表明,增加撞击速度,最大铺展直径增加,最小铺展厚度减小;增加球面直径,最大铺展直径增加,最小铺展厚度增加;超过一定粘度后,增加粘度系数,最大铺展直径减小,最小铺展厚度增加;增加表面张力系数,最大铺展直径减小,最小铺展厚度增加。在碰撞初期,铺展厚度以碰撞速度线性递减。当速度过大、球面直径或表面张力过小,会导致液膜出现中心局部破裂现象。The deposition behavior of a droplet impacting on a spherical surface during liquid-jet process was illustrated here.The deformation model of a single droplet depositing on the spherical surface substrate was established with the theory of volume of fluid（VOF）.The kinetic,spreading,relaxation and wetting phases of the droplet movement were respectively demonstrated in detail.The dynamic behavior of a droplet on a spherical surface was simulated with Fluent（6.3 version） numerical analysis platform.The effects of impact velocity,curvature radius of spherical surface,surface tension and viscosity on the deposition behavior of a droplet were investigated.There were several conclusions could be drawn from simulation results.They were that with increase in the impact velocity of droplet,the maximum spreading diameter increases and the minimum spreading thickness reduces;both the maximum spreading diameter and the minimum spreading thickness increase with increase in the diameter of target ball;after the viscosity coefficient of experiment liquid is larger than a certain value,the maximum spreading diameter reduces and the minimum spreading thickness increases with incease in its viscosity coefficient;when the surface tension coefficient of the liquid droplet increases,the maximum spreading diameter reduces and the minimum spreading thickness increases;in the initial stage of droplet spreading,the spreading thickness decreases linearly with increase in the droplet impact velocity;in addition,when the impact speed of the droplet is too large,either liquid＇s surface tension coefficient or the target sphere diameter is too small,a local breakage occurs at the center of the droplet colliding with a spherical surface during the first recoiling stage.

关 键 词：液滴 撞击 球面 表面张力 粘度 

分 类 号：O359.1[理学—流体力学]