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Volume 16, No. 12, December 2016, Pages 3012-3025 PDF(688 KB)  
doi: 10.4209/aaqr.2015.12.0683   

Experimental Parametric Study of Frequency and Sound Pressure Level on the Acoustic Coagulation and Precipitation of PM2.5 Aerosols

Mohsen Amiri1,2, Asghar Sadighzadeh1, Cavus Falamaki2

1 Safety & Environmental Lab, Nuclear Science and Technology Research Institute, AEOI, Tehran, Iran
2 Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran

 

Highlights
  • Rapid precipitation and coagulation at high acoustic intensity (≥ 155).
  • Dominant effect of turbulence induced interactions at high intensity (162 dB).
  • Development of a novel empirical correlation for filtration efficiency prediction.
  • Positive effects of frequency and sound pressure level on filtration efficiency.
  • At the condition of 749 (Hz) and 162 (dB) the filtration efficiency reaches 83%.

Abstract

 

The efficiency of particle removal for PM2.5 aerosols using conventional separation systems is generally low. In this paper, acoustic precipitation and coagulation of aerosols as a preconditioning system is investigated experimentally. The results of experimental study concerning the effect of frequency and sound pressure level (SPL) on the acoustic coagulation and precipitation of PM2.5 aerosols are presented. An acoustic particle conditioning setup was used to perform experiments at the resonance frequencies of 204, 550, 650 and 749 (Hz), and SPLs 140, 150, 155, 162 dB. All experiments were performed under ambient condition and similar initial concentration. The experimental results showed that the effect of acoustics on filtration efficiency is amplified by increasing the frequency and intensity. Eventually, at the frequency of 749 (Hz) and 162 (dB) the acoustic coagulation and precipitation efficiency reaches about 83% which is significant. The results of this study (experimentally and theoretically) prove the existence of a threshold in SPL (≥ 155 dB) at which the acoustic precipitation and coagulation efficiency increase rapidly, implying the importance of turbulence coagulation interactions at high intensity acoustic waves. In addition, a new empirical correlation was developed for the acoustic coagulation and precipitation efficiency with reasonable accuracy.

 

 

Keywords: Aerosol coagulation; Precipitation; Acoustic wave; Coagulation kernels; Turbulence interactions.

 

 

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