Open AccessStudy on Agglomeration of Ultrafine Droplet Particles by Acoustic Air-jet Generators
Author(s) -
Liangcai Wu,
Guangxue Zhang,
Yao Huihui,
Zhenfang Ma,
Zuohe Chi,
Liu Sheng-jia
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/721/1/012026
Subject(s) - economies of agglomeration , materials science , particle (ecology) , jet (fluid) , ultrafine particle , aerosol , sound pressure , volumetric flow rate , particle size , ranging , mechanics , acoustics , nanotechnology , chemical engineering , meteorology , physics , engineering , telecommunications , oceanography , geology
Acoustic agglomeration is a potential technology for fine particle pretreatment, but the high energy consumption restricts its industrial application. In order to develop a reliable sound source with low energy consumption, acoustic air-jet generators with frequencies ranging from 3 kHz to 8 kHz are adopted to study on the agglomeration effect of ultrafine droplet particles. The influences of frequency, flow rate and initial particle concentration on agglomeration efficiency are experimentally investigated. The results show that the acoustic frequency is a crucial factor for the agglomeration efficiency. The agglomeration efficiency of ultrafine droplet particles is higher than 55% at an optimal frequency of 6 kHz. The probability of collision between droplets increases with the increase of the initial mass concentration, which favors aerosol agglomeration. Moreover, it is shown that the sound pressure level increases with the increase of flow rate of compressed air.