Experimental study on eliminating various typical fire smokes by ultrasonic field--颗粒学报PARTICUOLOGY

Liu, S., Zhang, G., Li, W., Gu, H., Yuan, D., Tong, S., & Xu, J. (2025). Experimental study on eliminating various typical fire smokes by ultrasonic field. Particuology, 96, 180-192. https://doi.org/10.1016/j.partic.2024.11.010

Experimental study on eliminating various typical fire smokes by ultrasonic field

Shu Liu, Guangxue Zhang^*, Weihua Li, Hailin Gu, Dingkun Yuan, Sirui Tong, Jiangrong Xu

College of Metrology Measurement and Instrument, China Jiliang University, Hangzhou, 310018, Zhejiang, China

10.1016/j.partic.2024.11.010

Volume 96, January 2025, Pages 180-192

Received 10 September 2024, Revised 18 October 2024, Accepted 11 November 2024, Available online 29 November 2024, Version of Record 10 December 2024.

E-mail: zhangguangxue@cjlu.edu.cn

Highlights

• Employed airborne ultrasonic transducers as the acoustic source.

• Acoustic elimination of single material smoke and mixed material smoke is studied.

• There is an optimal frequency for agglomerating single material smoke.

• Agglomeration effect of mixed material smoke is greatly affected by particle size.

Abstract

To explore the effectiveness of acoustic agglomeration technology in eliminating urban fire smoke, an experimental setup for eliminating continuous smoke is built. This study uses airborne ultrasonic transducers as the sound source, with resonant frequencies are 13, 16, 18, and 20 kHz, respectively. Typical urban fire smoke is produced by the combustion of materials such as polystyrene (PS), polyvinyl chloride (PVC), carton, cotton, pine sawdust, and birch sawdust. The effects of ultrasonic frequency, sound pressure level, residence time and initial concentration on the elimination of both single material smoke and mixed material smoke types are investigated. Results indicate that the 16 kHz sound waves are most effective for PS, PVC, and carton smoke, whereas the optimum frequency for birch smoke is between 16 and 18 kHz. The optimal frequency of mixed smoke is significantly influenced by particle size and the ratio of large to small particles. When the sound pressure level is 142–154 dB, and the residence time is 4 s, the visibility of all types of smoke increased from 1 m to above the safe escape threshold (2.5 m). Furthermore, higher initial concentrations of smoke result in more effective elimination.

Graphical abstract

Keywords

Acoustic agglomeration; Fire smoke; Airborne ultrasonic transducer; Visibility

文章导读