Investigation of 2D drop evaporation on a smooth and homogeneous surface using Lattice Boltzmann method

In this study, we present a numerical simulation on behavior of a liquid droplet on a heated horizontal substrate to investigate the contact line motion using multiphase Lattice Boltzmann method. For this purpose, the model of Lee is used which is applicable to a wide range of density ratios. A proper source term is incorporated at the liquid-gas interface to account for the phase change process and the passive scalar method is employed to simulate the temperature field. The cubic boundary condition is adopted to model the effects associated with the wall boundary. Effects of Stefan number and density ratio on the dynamic of the evaporation are illustrated. The adopted method allows us to carry out the simulations with density ratios up to 1000 which previous LB models were unable to analyse. Finally the contact line motion of an evaporating droplet on a smooth substrate is investigated. The results show that the properties of the surface play an important role on the dynamic of the evaporation which was observed in other researches.