声场中微米级颗粒间二元碰撞的离散元模拟

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中图分类号：0359 文献标志码：A DOI：10.3969/j.issn.1003-9015.2024.00.017

文章编号：1003-9015（2025）03-0391-10

Abstract：Adiscreteelement model forbinarycolision betweenmicron particles intheacoustic fieldwasdeveloped.Basedonmodel validation，evolutions of contact force，overlap distance and particle velocity during collision were investigated.Moreover，influences ofthe angle between particles'center-line and wave motion directionas well as the particle radius on colision dynamics were examined.Results show that particles undergo several“compression-rebound” processs before agglomeration and experience only a single process of “compression-rebound” before separation.The larger the particles‘center-line deviates from the wave motion direction，the longer the agglomeration time，particularly，whenthe particles‘center-line isapproximately perpendicular to the wave motion direction，collsion between particles cannot occur.As the particle radius increases，thecollsion consequence transits fromagglomeration to separation.The agglomeration time decreases first and then tends to be constant，while the separation time isalmost unafected bythe particle radius.The research results can provide a basis foraccurate prediction of acoustic particle agglomeration processes.

Key words： micron particles；binary colision；external acoustic field;particleagglomeration；discrete elementmethod；numerical simulation

1前言

能源利用、冶金、化工等过程中排放出大量颗粒物，对人群健康和大气环境产生严重危害[1-2]。（剩余13258字）