Lattice Boltzmann simulation of dynamics of droplet impact on inclined walls

Abstract

In this study, phase field method of Lattice Boltzmann method (LBM) is employed to simulate the collision of a droplet with inclined dry walls under gravitational force. At first, dynamic behavior of moving droplet in a horizontal channel, through this method, has been investigated to verify convective boundary condition as the outlet one. Relatedly, falling of a droplet in vertical channel under gravity without any obstacle in certain Ohnesorge number (Oh) and Eotvos number (Eo), as related dimensionless numbers, is enquired. Then, breakup of a falling drop in the range of Eo [Formula: see text], Oh [Formula: see text], various angles of solid walls [Formula: see text], different sizes of the drop diameter [Formula: see text], influence of density ratio and parameter [Formula: see text] corresponding to surface tension are investigated. The results indicated that by increase in Eo, the breakup and deformation of droplet increased after collision while by growing Oh, the droplet retained its spherical shape. Change in the [Formula: see text] and [Formula: see text] has effect only on the size of generated fragments. Furthermore, higher density ratio reinforced gravitational force and resulted in more deformation of the droplet and its resistance was enhanced by higher parameter [Formula: see text].