Dynamic Modeling of Vertical Collision of Hollow and Dense Droplets on the Semicircular Surface in Spray Coating

The volume of fluid (VOF) method is used to simulate numerically the behavior of hollow and dense droplets on a solid semicircular surface. The process was numerically investigated for various droplet locations and collision arrangements. The numerical simulations are performed using OpenFoam software. The fluid phase of the hollow droplet is glycerin with an outer diameter of 5.25 mm, and the gas phase is air with a diameter of 4 mm. The laminar flow of Newtonian, incompressible, fluid phase is examined. The hydrodynamic behavior of droplet collisions and the jet characteristics are studied. As a result, the impact of droplets on the surface made a jet of fluid. The length of the fluid jet increased over time and jet height was observed when droplets collided with sinusoidal surfaces.