摘要：为了研究液滴在固体表面的流动特性,采用格子Boltzmann(LBM)分子动力学和水平集(LS)界面跟踪相结合的方法(LBM-LS)对液体在固体表面流动铺展过程进行数值模拟,用LBM求解液体运动的流场,LS捕捉运动的固液气界面。结果表明,模拟结果与实验测定结果一致,铺展接触角随时间呈指数变化规律,液体表面张力越小铺展接触角越小,证明采用LBM-LS模型模拟润湿性问题是可行的。

关键词：液滴；接触角；格子 Boltzmann 方法；水平集方法；数 值模拟

Abstract：In order to clarify the flow characteristics of liquid on the surface, the fluid spreading process on solid surface was simulated numerically based on lattice Boltzmann molecular dynamics and level set interface tracking method. LBM was employed to solve the flow field of fluid motion, and the interface of solid-liquid-gas was captured by LS method. The obtained simulation results are in good agreement with the experimental measurement results. The spreading contact angle changes exponentially with time, and the contact angle reduces with the decreasing of fluid surface tension. It is certifiyed that LBM-LS model proves feasible to simulate the wetting problem.

Keywords: droplet；contact angle；lattice Boltzmann method；level set method；numerical simulation