Simulation of droplet impact dynamics on V-shaped walls

Abstract

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 ( $$60^\circ \le \theta ^{eq} \le 120^\circ $$ ), Weber number ( $$102.27 \le \text {We} \le 3681.82$$ ), bending angle of the V-shaped wall (90 $$^\circ \le \theta \le 180^\circ $$ ), and eccentricity ratio (0 $$\le b \le $$ 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 $$\theta ^{eq}$$ , while it will become obvious against the increment of $$\theta $$ . In addition, the nondimensional spreading length, width, and height are measured and analyzed. Regime maps are established based on We, Re, and $$\theta $$ .