超声驻波场中固液黏附液滴悬浮分离研究  

Mathematical modeling and experimental study on solid-liquid suspension separation in ultrasonic standing wave field

作　　者：麻寿东 吴立群[1] 郭亚杰 庄龙 吴浩 MA Shoudong;WU Liqun;GUO Yajie;ZHUANG Long;WU Hao(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,Zhejiang,China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018

出　　处：《声学技术》2020年第5期581-585,共5页Technical Acoustics

基　　金：国家自然科学基金(51175134);浙江省自然科学基金重点项目(LZ15E050004);浙江省自然科学基金(LQ17E050012、LY15E050024);浙江省博士后基金(2018-61)资助项目。

摘　　要：针对影响高能束内加工质量和效率关键因素,提出新的废屑排出方法。首先建立了超声驻波作用下固液分离数学模型;其次模拟了有无液滴声场分布;然后模拟并试验研究了液滴的形变及运动过程。结果表明,液滴周围的声压大于液滴内部的声压,可促使液滴收缩分离,为液滴超声悬浮分离提供理论支持;在声辐射力、表面张力、黏附力、静压等力耦合作用下,液滴发生变形驱动液滴周围的气流向中心集聚,进而实现分离,并以中央凹陷的扁平球状稳定悬浮于声波节点。A new method of removing waste chips is proposed by focusing on the key factors affecting the processing quality and efficiency of high energy beams.Firstly,a mathematical model has been established to provide the theoretical basis for the separation of solid-liquid suspension under ultrasonic standing wave.Secondly,the distribution of sound field with and without droplet has been simulated.Thirdly,the deformation and movement of droplets are simulated and tested.It is found that the sound pressure around the droplet is greater than the sound pressure in the droplet,which can promote the separation of droplets and provide theoretical support for the ultrasonic suspension separation of droplet;under the interaction of acoustic radiation force,surface tension,adhesion and static pressure,the droplet is deformed,so that the gas fluid around the droplet is concentrated in the centre to achieve droplet separation,and the droplet just as a flat ball with a central sag is stably suspended in the acoustic wave node.

关 键 词：驻波声场 固液黏附 悬浮分离模型 排屑机理 

分 类 号：TB559[理学—物理]