低频声波作用下液滴气溶胶的团聚特征与机理分析
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中图分类号：X513 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.03.001
Characterization and mechanism of droplet aerosol agglomeration under the effect of low-frequency acoustic waves
LIU Hengyuan’，ZHONG Zhaoping'，NIE Junle’， XU Yueyang²，YANG Yuxuan1 ZHOU Junwu¹，LI Yihui1 （1.School of Energyand Environment，Southeast University，Nanjing 211189，China；2.State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission， China Energy Science and Technology Research Institute Co. Ltd.，Nanjing 21O023，China）
Abstract： Industry generates a large number of liquid droplets which，if not treated，can cause waste or polution， and evenposeasafety hazard.To investigate theefect ofacousticon theagglomerationofdroplet aerosols，an experimental platform was setup with a laser testing system to monitor the transmitance of droplet aerosols in real time.The study primarily focused on the influences of the presence of acoustic waves，acoustic frequency，sound pressure level，and initial droplet mass concentrationon droplet agglomeration，andalsoanalyzed the agglomeration mechanism.The results show that：under the efect of acoustic wave，the droplet aerosol dissipates rapidly，and the transmittance reaches 68% in1O s，while the transmittance does not change in 6O s whenthere is no acoustic wave; Thebest droplet agglomeration is observed at an acoustic frequency of 1000Hz ，andcalculation of the entrainment coefcient and therelative entrainment coeficient indicates that the orthokinetic interaction plays a majorroleat this frequency；The higher thesound pressure level，the faster the change in transmitance of the droplet aerosol， and the bettertheagglomeration effect，but the sound pressure level should notbetoo high as it would increase energyconsumption and lead to nonlinear efects，limiting the improvement in agglomeration eficiency;Higher initial droplet mass concentration results in faster agglomeration rates because there are more droplets within a unit volume，reducing the distance between droplets and making collsions and aglomeration more likely.This study reveals the characteristics and mechanisms of droplet aerosol agglomeration，providing important theoretical guidance forthe effective control of droplets in industrial production processes.
Key Words：acoustic agglomeration；droplets；aerosols；agglomeration；transmittance
1前言
声波团聚是一项利用高能声场的气溶胶团聚技术，通过声场的能量对气溶胶进行处理，使气溶胶之间发生相对运动，碰撞团聚，形成粒径更大的气溶胶[1]。（剩余14286字）
