Combined effect of acoustic field and gas absorption on evaporation of slurry droplet

In this study, we developed a model of convective heat and mass transfer of an acoustically levitated slurry droplet that evaporates in an atmosphere of air, water vapor, and soluble gas. The advanced model considered the effects of acoustic streaming, forced convection, and non-isothermal gas absorption on the evaporation rate of a liquid droplet containing small solid particles. It is shown that the time of porous shell formation decreases with the increase of sound pressure level (SPL) and increases with the increase in frequency. Adding soluble gas to the gaseous phase shortens the time required for porous shell formation during slurry droplet drying. As shown by numerical calculations, in a gas mixture containing air with an ammonia content of 30%, at a temperature of 293 K and a humidity of 50%, with an acoustic field frequency of 2 pi center dot 45 kHz and an SPL of 140 dB, the time of porous shell formation of a silica-water slurry droplet with the initial radius of 250 mu m is about half shorter than that in a gas mixture not containing an active gas. The prediction of the developed model was in good agreement with the experimental results available in literature.

Automated summary

This study developed a model to investigate the convective heat and mass transfer of an acoustically levitated slurry droplet that evaporates in an atmosphere containing air, water vapor, and soluble gas. The model considered various factors such as acoustic streaming, forced convection, and non-isothermal gas absorption. The results showed that the formation time of a porous shell decreased with increasing sound pressure level (SPL) and increased with increasing frequency.