Study on aerosol agglomeration using the airborne ultrasonic transducer
作者机构：The Institute for Energy EngineeringChina Jiliang UniversityHangzhou310000China
出 版 物：《Particuology》 (颗粒学报(英文版))
年 卷 期：2023年第82卷第11期
页 面：157-165页
核心收录：
学科分类：07[理学] 070206[理学-声学] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China(Grant No.52276162 and 51876197) the Fundamental Research Funds for the Provincial Universities of Zhejiang.
主 题：Acoustic agglomeration Airborne ultrasonic transducer Aerosol Sound pressure level Initial concentration
摘 要：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.
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