超声对气液鼓泡流中气泡发生频率的作用

The Influence of Ultrasonic on Bubble Formation Frequency in Gas-Liquid Bubble Flow

在内径160 mm,高300 mm 的玻璃槽中,采用0～200 W 可调功聚能型超声波发生器研究了超声波功率、聚能头与进气管距离、聚能头放置方式、聚能头投入深度、进气流量和反射室直径等因素对气液鼓泡流中气泡发生频率的影响。实验结果表明,聚能头竖直放置时,随着功率的增加,单位时间内气泡数目先减少而后急剧增加;聚能头水平放置时,单位时间内气泡数目随着功率增加而增加;聚能头距分布管越远,超声波对气泡的破碎作用越小,气体流量越大,单位时间内气泡数目越多,反射室直径在一定范围内越小,单位时间内气泡数目越多。

The intensification of bubble formation frequency was studied in a glass vessel of 160 mm in diameter and 300 mm in height with a 0--200 W ultrasonic generator. The Influence factors on the frequency of bubble formation were determined experimentally. The results showed that the frequency of bubble formation decreased firstly and then rose with the increasing ultrasonic power when the focusing probe faced vertically downwards. The frequency of bubble formation increased with the increasing ultrasonic power when the focusing probe was horizontally placed. The longer the distance between the focusing probe and the sparger, the less the bubble formation frequency. Smaller size of reflecting room was favorable to bubble breakage.