Effect of hydrodynamic and fluid-solid interaction forces on the shape and stability of a droplet sedimenting on a horizontal wall

In this paper, we study the sedimentation of droplet onto horizontal surfaces using a Shan and Chen multicomponent lattice Boltzmann model. Numerical simulations are performed for static nonwetting droplets and are compared with a theoretical model. Further simulations are performed using wetting droplets and changing the wetting characteristics of the surface. Novel study of droplet sedimentation with different wetting characteristics of wall surface shows three different regimes of droplet shapes. The process of different regimes can be controlled by changing the wetting characteristics of surface. It is observed that the droplet attains nonequilibrium region as the attraction force of surrounding droplet with the wall increases. This can lead to eventual breakup of the droplet.