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 (60o ≤ θeq ≤ 120o), Weber number (102.27 ≤ We ≤ 3681.82), bending angle of the V-shaped wall (90o ≤ θ ≤ 180o), 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 θeq, 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.

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