2021•The Proceedings of Mechanical Engineering Congress JapanOpen access
Aggregation of microbubbles by ultrasonic irradiation
Tsubasa TAKAHASHI, Shuya YOSHIOKA
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Abstract
In this paper, the aggregation of microbubbles by ultrasonic irradiation is attempted. The effect of ultrasonic frequency on the area of captured aggregates and the diameter of formed bubbles were investigated. The microbubbles are generated in a polydiaperse (1~100μm) by the porous material in the water tank. The microbubble group was irradiated with ultrasonic waves of three different frequencies (26,78,130kHz) in order to investigate the influence of the frequency of ultrasonic waves. The resonance diameter of the microbubble was changed by changing the frequency of ultrasonic wave. As a result, aggregate is formed from microbubbles by ultrasonic irradiation. The microbubbles which are smaller than a resonance diameter captured at the antinodes of the ultrasonic wave and the microbubbles which are bigger than a resonance diameter captured at the nodes of the ultrasonic wave. It was shown that the area of the aggregate increases as the frequency of ultrasonic wave increases. It was possible to control the diameter of the bubbles formed aggregates.