Numerical Simulation of Condensation of Natural Fog Aerosol under Acoustic Wave Action

Acoustic condensation has proved its excellent performance in the dissipation of suspended fine particles. It is also promising for artificial fog dissipation, but the current research is still lacking. This paper sums up the mathematical model of acoustic condensation. Considering the physical properties of droplets, the improved root mean square (IRMS) acoustic condensation kernel function is proposed, which is compared with the analytic solution to verify the correctness. Through the method of numerical simulation, different condensation effects of the different condensation mechanisms are compared. Study the effect of acoustic frequency, sound pressure level and initial concentration on the condensation of natural fog aerosol under the action of sound waves. The results show that the droplet condensation efficiency can be improved by acoustic effect significantly; The effect of acoustic frequency on droplet condensation is nonlinear, and there is an optimal frequency of 600 Hz. Besides, high-frequency sound wave has a better effect on small particles' condensation, while low-frequency sound wave has a better effect on large particles' condensation. The sound pressure level and initial particle concentration is positively correlated with the condensation efficiency, and there is a critical particle size. After the acoustic condensation, the concentration of particles larger than the critical particle size increases, and decreases conversely.