Micro Gas Bubble Generation Using Ultrasonic Wave

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Micro gas bubble generation using ultrasonic wave was investigated experimentally. We found that micro bubbles with around 10μm in average are stably generated from a needle in an ultrasonic field when we supply gas through the needle at several μl/min. In this paper, to clarify the mechanism of the micro bubble generation using ultrasonic wave, we measured the size distribution of the bubbles released from the needle with a microscope. We also investigated the effect of the exited frequency of the ultrasonic wave on the average bubble diameter and the applicability of an analytical expression for a droplet atomization to the fragmentation of the bubble. The results reveal that the average bubble diameter decreases as the exited frequency increases. And nonlinearity of capillary wave seems to make the average diameter of the bubbles much smaller than that of atomized droplets.