Thermohydrodynamics of an evaporating droplet studied using a multiphase lattice Boltzmann method

摘要

In this paper, the thermohydrodynamics of an evaporating droplet is investigated by using a single-componentpseudopotential lattice Boltzmann model. The phase change is applied to the model by adding source terms tothe thermal lattice Boltzmann equation in such a way that the macroscopic energy equation of multiphase flowsis recovered. In order to gain an exhaustive understanding of the complex hydrodynamics during evaporation, asingle droplet is selected as a case study. At first, some tests for a stationary (non-)evaporating droplet are carriedout to validate the method. Then the model is used to study the thermohydrodynamics of a falling evaporatingdroplet. The results show that the model is capable of reproducing the flow dynamics and transport phenomenaof a stationary evaporating droplet quite well. Of course, a moving droplet evaporates faster than a stationaryone due to the convective transport. Our study shows that our single-component model for simulating a movingevaporating droplet is limited to low Reynolds numbers.