An improved model on the evaporation kinetics of the single aerosol droplet and its application for the droplet composed of ammonium sulfate or sucrose solution

An improved model is proposed to investigate effects of gas phase temperature, relative humidity and initial solute concentration on the evaporation rate of the aerosol droplet consisted of ammonium sulfate (AS) or sucrose (SC) solution and the water diffusion coefficient in bulk phase. Results show that the new model is more accurate than the traditional model ignoring the bulk phase mass diffusion. Effect of the bulk phase mass diffusion on the evaporation rate of the AS-water droplet is almost unaffected by factors studied here due to the predominance of the mass transfer in gas phase and gas-droplet interface. However, effect of the bulk phase mass diffusion on the evaporation rate of the SC-water droplet is negatively correlated with the gas phase temperature and the relative humidity, but it is positively correlated with the initial solute concentration. Furthermore, influence mechanisms of the water diffusion coefficient in AS (SC)-water droplets are revealed.