Computational study on dynamic behavior during droplet-particle interaction

Abstract

In this study, the dynamic behavior of droplet collision with a dry, stationary, spherical particle was numerically investigated based on the level contour reconstruction method (LCRM). A broad range of impact conditions: Weber number (30 <= We <= 90), surface wettability (20 degrees <= theta(eqi) <= 175 degrees), and droplet-to-particle size ratio (1/4 <= Omega <= 1/2), are considered, and three major impact outcomes: deposition, partial rebound, and complete rebound, are analyzed in detail. The dynamic spreading factor (for deposition cases), contact time (for complete rebound cases), and mass and momentum of the rebounded droplet (for partial rebound cases) were quantitatively investigated. The study quantitatively and systematically investigated the mass and momentum of (partially) rebounded droplets. We confirmed that the contact time of a (completely) rebounded droplet is independent of the surface curvature of the spherical particle as well as the impact velocity with the given impact conditions. (C) 2021 Elsevier Ltd. All rights reserved.