流动液体中夹杂物超声去除的影响因素

以高密度聚乙烯（HDPE）颗粒和水形成的悬浮液为研究体系。考察了有无超声波作用下。介质流量、夹杂物数量以及夹杂物的粒径对总去除率、上浮去除率、壁面粘附去除率的影响。实验结果表明，在短时间内（30s)超声波对流动液体中的夹杂物具有明显的去除效果。总去除率达93％。夹杂物的总去除率随着超声波输入电功率的增大而提高；超声波对较多数量或较大粒径的夹杂物去除效果更显著。超声波作用下流动液体中的夹杂物比静止液体中的更容易去除。超声波对流动液体中夹杂物去除效果的去除机理主要是通过气泡捕获夹杂物，超声空化效应产生直接包裹夹杂物的气泡以及通过夹杂物碰撞凝聚使夹杂物容易上浮实现去除。

ULTRASONIC SEPARATION OF INCLUSIONS FROM FLOW LIQUID

By using the suspension made of high density polyethylene particles and water as a model, the possibility of ultrasonic separation of inclusions in flow fluid has been experimently investigated. The variations of parameters such as ultrasound power input, flow rate, amount of particle input and particle size, have been found to have significant effects on total removal rate (TRR), floatation removal rate (FRR) and adhesion removal rate (ARR) of inclusion particles. The experimental results showed that the inclusions in flow liquid were obviously removed (up to 93%) under short time (30 s) imposing ultrasound, and that TRR increased with increasing ultrasound power. It has been shown that the higher TRRS are obtained for more amount of particle input and larger size inclusion, and the inclusions in flow liquid are removed easier than those in static liquid. The separation process is through the acoustic cavitation induced bubbles, bubbles traping the inclusions, and the floatation due to accumulation of inclusions.