Study on aerosol agglomeration using the airborne ultrasonic transducer--颗粒学报PARTICUOLOGY

Guo, Y., Zhang, G., Li, Y., Gu, H., Yuan, D., & Liu, M. (2023). Study on aerosol agglomeration using the airborne ultrasonic transducer. Particuology, 82, 157-165. https://doi.org/10.1016/j.partic.2023.01.017

Study on aerosol agglomeration using the airborne ultrasonic transducer

Yuxin Guo, Guangxue Zhang ^*, Yunchao Li, Hailin Gu, Dingkun Yuan, Maosheng Liu

The Institute for Energy Engineering, China Jiliang University, Hangzhou, 310000, China

10.1016/j.partic.2023.01.017

Volume 82, November 2023, Pages 157-165

Received 4 November 2022, Revised 24 December 2022, Accepted 29 January 2023, Available online 11 February 2023, Version of Record 21 February 2023.

E-mail: zhangguangxue@cjlu.edu.cn

Highlights

• An airborne ultrasonic transducer was designed and applied to agglomeration.

• Sound pressure levels of the agglomeration chamber can reach 156 dB.

• Airborne ultrasonic transducer has good agglomeration effects.

• Light transmittance of smoke rapidly increases to 60% within seconds.

Abstract

Acoustic agglomeration technology use high-intensity acoustic field to make aerosol particles collide and condense rapidly. Existing studies have shown that 70%–90% of fine particles can be eliminated within minutes using compression drives and air-jet generators. Currently, there are limitations to the sound sources used. In this paper, an airborne ultrasonic transducer with a resonant frequency of 15 kHz is designed, followed by the corresponding numerical simulation and experiments for the evaluation of the vibration modal and sound pressure field. The sound pressure levels (SPL) of the open space and the agglomeration chamber can reach 150 dB and 156 dB, respectively. The agglomeration effect of water droplets, liquid phase smoke, solid phase smoke and mixed smoke is experimentally investigated, and the light transmittance rapidly increases from 8% to 60% within 4 s, 8 s, 5 s and 6 s, respectively. Agglomeration is also effective in the high-frequency range, and we infer that the acoustic wake effect is the predominant mechanism. The elimination effect is promoted with the increasing of SPL until the corresponding secondary acoustic effect is enhanced. Moreover, the agglomeration rate of higher concentration aerosol is significantly better than that of diluted aerosols in ultrasonic agglomeration process.

Graphical abstract

Keywords

Acoustic agglomeration; Airborne ultrasonic transducer; Aerosol; Sound pressure levelInitial concentration

文章导读