The effect of natural convection on the modeling of sessile and suspended evaporating drops

Motivation: Analytical models commonly assume that the mass transfer from a liquid drop in a stagnant environment is a diffusion-driven phenomenon. In the presence of external body forces, like gravitation, natural convection arises affecting the drop evaporation. Objective: To study the effect of natural convection on the evaporation of sessile and pendant drops, considering the buoyancy caused by the variation in the gas density due to the uneven distribution of the vapour concentration and temperature in the gas mixture.