基于SPH方法的液滴自运动数值研究

Numerical study on the droplet self-motion based on the SPH method

为研究液滴在具有润湿性表面上的自运动规律,基于光滑粒子流体动力学(SPH)方法,对具有不同表面张力梯度壁面上的液滴自运动进行了数值模拟研究,结果显示,表面张力梯度润湿形式为指数函数时液滴的位移最大,且位移随时间的变化较为平缓;表面张力系数函数图像越凹陷,液滴与壁面的接触长度越长,反之越短;液滴半径和密度对液滴的位移影响不大,而对黏性的影响较大。

In order to study the self-motion law of droplets on surfaces with wettability,numerical simulations of the droplet self-motion on surfaces with different surface tension gradients are carried out on the basis of smoothed particle hydrodynamics(SPH),and the results show when the surface tension gradient wetting form is exponential function,the droplet displacement is the largest,and the displacement changes gently with time.The more concave the image of the surface tension coefficient function is,the longer the contact length between the droplet and the wall is,or vice versa;the droplet radius and density have little effect on the displacement of the droplet self-motion,while the viscosity has a greater effect.