Abstract: The process of droplets splashing on liquid film is simulated using a large-density lattice Boltzmann pseudo-potential model with tunable surface tension. The effects of Reynolds number, Weber number, liquid film thickness, and collision angle on the evolution of the liquid crown are analyzed. Results demonstrate that the energy loss during the impact decreases with the increase of Reynolds number, but augments with the thickening of liquid film; the upstream and downstream crown heights both rise with the increase of Reynolds number, Weber number, and collision angle, but reduce after increment with the change of film thickness, and peaks when liquid film thickness is 0.25 times of droplet radius. The crown extension length also increases with the growing of Reynolds number and collision angle, but does not vary with the increase of Weber number, and meanwhile shrinks with the thickening of liquid film.

Key words: lattice Boltzmann method, pseudo-potential model, oblique impact, crown evolution, crown splashing