Swirling-type microbubble generation device

A swirling-type microbubble generation device comprising:

• a cylindrical container body that is closed at one end by a wall body and is open at another end;
• a gas inlet provided in a wall body of the cylindrical container body on the one end side;
• and
• a pressurized liquid inlet provided in part of a circumferential wall of the cylindrical container body such that the pressurized liquid inlet is open in a direction of a tangent to an inner circumference of the cylindrical container body,
• wherein:
• the wall body on the one end side is formed in a shape of a cone or a truncated cone protruding toward the other end side, and an inclination angle θ of a side face of the wall body having the shape of the cone or the truncated cone is set to 10° to 70° so that a tip end portion of a space within the container body on the one end side, as seen in longitudinal cross-section, has an M-shape,
• a cover body having an outwardly protruding pipe body in a center of the cover body is securely or detachably attached to an opening of the container body on the other end side, so that a swirling gas-liquid mixture containing microbubbles is allowed to be guided through a tip end of the cover body, and
• an inside diameter (D1) of the container body is 2 to 4 times an inside diameter (D4) of the pipe body [D1=(2 to 4)×D4], and a length (L2) of the pipe body is 0.2 to 2.0 times the inside diameter D1 of the container body [L2=(0.2 to 2.0)×D1].