Simulation of a Liquid Droplet Impinging on a Horizontal Solid SubstrateUsing Lattice Boltzmann Moment Model

摘要

The shape and surface texture of a liquid droplet were studied in two-dimension when adroplet impinges on a solid substrate under isothermal condition. The lattice Boltzmann momentmodel was applied to simulate the fluid dynamics considering the adhesive interaction betweenfluid particles and surfaces. The results show the influence of wetting on the process and the dropshape. For the hydrophobic surface, the process after impinging may be divided into two stages: thespreading process driven by inertial forces and the subsequent oscillation (recoiling process) drivenby surface tension forces. While for the hydrophilic surface, the droplet will only deposits on thesurface and there is no the recoiling stage. In addition, the effects of the impinging speed on theshape and texture of the droplet were studied. The spreading speed and the maximum diameter ofthe spreading droplet increase with the rise of the impinging speed.