强驻波声场对微小颗粒群作用的实验研究

Experiments on tiny particles effected by intense standing wave field

用实验手段研究了以空气为介质的强驻波声场 (声压级大于 1 5 0dB)对其中微小颗粒群 (颗粒直径小于 30 μm)的作用。实验中观察到了颗粒有规律地向波节点运动的现象 ,并发现聚集颗粒群中含有周期性长大、破裂而喷发的气泡。这些现象与声流及声辐射压力有关。

In this article,experiments on tiny particles(whose diameter is less than 30μm)effected by intense wave field(whose sound pressure level is larger than 150 dB)are developed. In the experiment, particles regularly move to the nodes of the wave field where we found bubbles form, grow up, and burst at last in periodic way. Some interesting phenomena are observed which related to acoustic streaming and acoustic radiation pressure. It is helpful to understand the intense acoustic field more clearly through analyzing the phenomena.