Simulation of droplet impact dynamics on V-shaped walls

This paper presents the morphological evolution characteristics of a droplet impacting a V-shaped wall by using the lattice Boltzmann method (LBM). Four parameters are investigated comprehensively. The parameters vary over wide ranges: surface wettability (60 o  ≤  θ eq  ≤ 120 o ), Weber number (102.27 ≤  We ≤ 3681.82), bending angle of the V-shaped wall (90 o  ≤  θ  ≤ 180 o ), and eccentricity ratio (0 ≤  b  ≤ 0.5). Two types of collision are observed: deposition and breakage. For breakage, the number of satellite droplets increases against the increment of We. The splashing occurs for a high We . And the lamella ejection is observed on the hydrophilic wall and the neutral wall. The lamella ejection will be slight against the increase of θ eq , while it will become obvious against the increment of θ . In addition, the nondimensional spreading length, width, and height are measured and analyzed. A regime map is established based on We and θ .