Numerical Study of Radial Deformation and Energy Conversion in Head-on Collision of Two Equal-size Droplets

摘要

A numerical study on the radial deformation, energy conversion and mass mixing in the head-on collision of two equal-sized droplets is conducted. The axisymmetric incompressible laminar Navier-Stokes equations are solved. The Volume of Fluid method is employed for tracking the liquid-gas interface. The simulation results reveal that the maximum radial deformation of the coalesced droplet increases with the Weber number. A simplified deformation prediction model is proposed for the radial deformation stage of the coalesced droplet. The Weber number has a significant influence on the conversion between kinetic energy and surface energy. Moreover, the mass mixing of colliding droplets is observed by using the tracer particles.