Numerical investigation on fluid elasticity effect in the impact of oblique drop on liquid film

In this paper, the crown formation due to the oblique impact of a plane two-dimensional drop onto preexisting film in viscoelastic fluid is analyzed numerically. The finite volume method (FVM) is applied to simulate the governing equations and the volume of fluid (VOF) technique is used to track the free-surface of liquid. Here, the well-known Oldroyd-B model is used as the constitutive equation for viscoelastic phase. Here, formation and temporal evolution of the well-known crown parameters is emphasized, while presence of elastic and surface tension forces are considered. The results show that the increases in Weissenberg number, viscosity ratio and Weber number cause to increases in dimensionless crown height ( ) and spread factor ( ), while impact angle has major effect on crown height on the other hand has minor effect on spread factor in viscoelastic fluid. Also, the crown height increases and the crown radius decreases by film thickness. As a main finding of present study, we can conclude that the fluid elasticity in the presence of surface tension forces enhances the crown propagation in drop impact problem.