Bubble generating apparatus, tubular member, bubble generating method and method for producing bubble generating apparatus

摘要

The air bubble generation device comprises a metal capillary (10) for passing water, and a pump for pumping water containing a gas component into the metal capillary (10). Inside the metal thin tube (10), a throttling portion (11) is provided in which the passage of water is narrower than before and after the flow direction of the water. The throttle portion (11) has a rectangular cross-sectional shape orthogonal to the flow direction. The gas component contained in water is dissolved in water by pumping water to the throttling portion (11), and bubbles are deposited by a decrease in pressure at the throttling portion (11), and turbulence is generated in the water at the throttling portion (11) The air bubbles in the water are crushed by the shear force, and the air bubbles are crushed by the shock wave by the transonic flow generated in the water coming out of the constriction part (11).