水液滴撞击导流面成膜过程数值模拟

对液滴撞击亲水导流壁面后的液膜形成过程进行了理论分析,用基于CLSVOF方法的数值模型,分析了液滴撞击亲水表面后的铺展特性,研究了不同表面张力系数和液滴直径对液滴撞击亲水表面润湿直径的影响.结果表明,CLSVOF方法可以用于液滴撞击亲水导流壁面的模拟;液滴撞击壁面达到最大润湿直径的时间随着表面张力系数的增大而减小;液滴撞击在亲水壁面上的最大润湿直径随着液滴初始直径的增大而增大,液滴完成一次铺展收缩过程需要的时间也随液滴初始直径的增大而增加;为进一步研究液滴撞击导流壁面成膜对导流壁面的保护作用提供了理论基础.

Numerical Simulation of Liquid Film Formed by a Water Droplet Impinging onto a Diversion Surface

The theory analysis of the liquid film is formed by the droplet impinging on the hydrophilic diversion wall was carried out.With a theoretical model based on the CLSVOF method,the spreading characteristics of droplet impinging on a hydrophilic surface were analyzed.The effects on wetting diameter of different surface tension coefficients and different droplet diameters were researched.The results have shown that the CLSVOF method can be used for the simulation of a droplet impinging on a hydrophilic surface.The time of the droplet impinging on the diversion wall to reach to the maximum wetting diameter decreases as the increase of the surface tension coefficient of the droplet.The maximum wetting diameter of the droplet impinging on a hydrophilic surface increases as the increase of the initial droplet diameter.The time of the droplet spreading and recoiling increases as the increase of droplet diameters.It provides a theoretical basis for the further study of the protective effects of the liquid film formed by the droplet impinging on the diversion wall.