A lattice Boltzmann method (LBM) based on Shan-Chen pseudo-potential model is used to investigate the process of droplets merging and shedding on a gradient wetting circular surface. The effects of wetting gradient, radius, and radius ratio on droplet merging and shedding were mainly explored. The results show that applying a wetting gradient on the circumferential surface can accelerate the process of droplet merging and shedding. The velocity of droplets merging and shedding increase with the increase of the wetting gradient. The more hydrophilic the original surface, the better the optimization effect of accelerating drainage is by applying a wetting gradient. The radius and radius ratio significantly affect droplets merging and shedding on the gradient wetting surface. The larger the radius and radius ratio, the shorter the droplets merging and shedding time.

基于Shan-Chen赝势模型的格子Boltzmann方法（LBM）用于研究液滴在梯度润湿圆形表面上的合并和脱落过程。主要探讨了润湿梯度、半径和半径比对液滴合并和脱落的影响。结果表明，在圆周表面施加润湿梯度可以加速液滴合并和脱落过程。液滴合并和脱落的速度随着润湿梯度的增加而增加。原始表面越亲水，通过应用润湿梯度加速排水的优化效果越好。半径和半径比显着影响液滴在梯度润湿表面上的合并和脱落。半径与半径比越大，