液滴碰撞实验与数值模拟研究

Experimental and Numerical Simulation Study on Droplet Impact

通过实验研究与数值模拟相结合的方法研究了液滴碰撞现象,分析了液滴铺展和反弹现象,并讨论了液滴半径和表面张力系数对液滴运动过程的影响。结果表明:数值模拟结果与实验观察结果吻合较好,振荡强度随液滴半径的增加而减小,随碰撞速度的减小而增强;随表面张力系数的减小,振荡衰减更快,同时振荡频率减小;液滴铺展到最大值所用时间与碰撞速度和表面张力系数有关。

Experimental and numerical simulations were used to study the dynamic process of droplet impact.In the paper,the influence of droplet radius and surface tension coefficient on the process of droplet outspread and rebound were discussed in detail.The results from numerical simulation are in good agreement with those from the experiments.The oscillation intensity decreases as the droplet radius increases,and it increases when the droplet velocity decreases.The oscillation magnitude and frequencies decrease considerably along with reduction of the surface tension coefficient.Also,there is a relationship between the droplet outspreading time and impact velocity as well as surface tension coefficient.