Chang Liu, Yun Zhao, Zhangfu Tian, Hefeng Zhou This email address is being protected from spambots. You need JavaScript enabled to view it. 

College of Meteorology and Oceanography, National University of Defence Technology, Changsha, China


 

Received: June 30, 2020
Revised: September 14, 2020
Accepted: September 22, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.06.0361  

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Cite this article:

Liu, C., Zhao, Y., Tian, Z. and Zhou, H. (2020). Numerical Simulation of Condensation of Natural Fog Aerosol under Acoustic Wave Action. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.06.0361


HIGHLIGHTS

  • Numerical simulation data are derived from actual observations of natural fog.
  • Propose the improved root-mean-square condensation kernel function.
  • The sectional method predicts the detailed evolution of particle size distribution.
  • The condensation effect of various condensation mechanism is compared.
  • The results provide the optimal parametric of acoustic condensation on natural fog.
 

ABSTRACT


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.


Keywords: Acoustic condensation; Natural fog; IRMS kernel function; Sectional method; Numerical simulation.




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