Constitute a micro-bubble generator by binding to and coaxial vortex breakdown nozzle and swirl flow generating vane type nozzle. By swirling flow generation vane type nozzle, I generate a swirling flow of liquid gas has been introduced into the center. By supplying the contraction flow of the vortex breakdown nozzle of the swirling flow, so as to generate microbubbles from the vortex breakdown section. I carried out by air supply the introduction of gas into the liquid.
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