A new model of bi-component droplet heating and evaporation

A new model of bi-component droplet heating and evaporation is described. The model considers the effects of temperature gradient and component diffusion in the liquid and gas phases, assuming that all processes are spherically symmetric. The simplified forms of heat transfer and component diffusion equations were solved analytically in the liquid phase and numerically in the gas phase at each time step. These solutions were implemented in the numerical code, predicting the time evolution of the distribution of droplet temperatures in the liquid and gas phases and the droplet evaporation rate. The model predictions were verified in the limiting case when one component was used, using the predictions of a previously developed model for mono-component droplet heating and evaporation. For the bi-component droplets, they were verified using COMSOL Multiphysics calculations. The validation of model predictions was performed using in-house experimental data.