Method, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles

An apparatus for generating micro-nano bubbles having a diameter of 60 μm or smaller, using water hammering power created by a mutual collision of jets of a gas-including liquid, comprising:

• a gas port, a liquid pipe and a regulating valve for sucking each of a gas and a liquid;
• a pump for pressurizing the gas and the liquid in a mixture and transferring them;
• a gas-liquid mixing vessel for enriching the dissolved gas by mixing the transferred liquid, which includes the gas, with new gas;
• and
• a bubble generating nozzle for generating micro-nano bubbles using the gas-including liquid prepared in the gas-liquid mixing vessel, wherein the bubble generating nozzle comprises:
• a hollow cylinder having two or more through-holes with a diameter of 0.1 to 6.0 mm, arrayed in the circumferential direction thereof with such a configuration that the respective opening of each of the two or more through-holes faces each other in the same plane;
• and
• a micro-nano bubble discharge port provided on at least one end of the hollow cylinder,
• wherein the through-holes are arranged so that all of their extension lines passing through respective center of the cross-section of each of the through-holes intersect each other in the inside of the hollow of the cylinder;
• wherein, in order to maintain the inflow direction of the gas-including liquid unchanged until reaching the inlet position of the through-holes, the hollow cylinder is arranged either perpendicularly to an inflow direction of the gas-including liquid so as to align openings of the through-holes with the inflow direction thereof, or arranged in parallel to the inflow direction of the gas-including liquid using a cylinder which has one end formed into a closed tube-like shape and an outer wall with a smaller cross-sectional area than that of an introduction port of the gas-including liquid, provided inside a nozzle case for feeding the gas-including liquid to the cylinder.

A method for generating micro-nano bubbles having a diameter of 60 μm or smaller, using water hammering power, the method comprising:

• producing jets of a gas-including liquid by injecting the liquid from the outside of a cylinder via two or more through-holes in the cylinder, at a squirting pressure of 0.2 MPa to 0.6 MPa, the two or more through-holes having a diameter of 0.1 to 6.0 mm, arrayed in the circumferential direction thereof with such a configuration that the respective openings of such two or more small through-holes are arranged facing each other in the same plane;
• creating a collision of the jets of the gas-including liquid inside the cylinder;
• and
• generating micro-nano bubbles having a diameter of 60 μm or smaller, by the mutual collision of the jets of the gas-including liquid,
• wherein, in order to maintain the inflow direction of the gas-including liquid unchanged until reaching the inlet position of the through holes, the cylinder is either arranged perpendicularly to an inflow direction of the gas-including liquid so as to align the openings of the through-holes with the inflow direction thereof, or arranged in parallel to the inflow direction of the gas-including liquid using a cylinder which has one end formed into a closed tube-like shape and an outer wall with a smaller cross-sectional area than that of an introduction port of the gas-including liquid, provided inside a nozzle case for feeding the gas-including liquid to the cylinder.

A method for generating micro-nano bubbles using water hammering power, the method comprising:

• producing jets of a gas-including liquid by injecting the liquid from the outside of a cylinder via two or more through-holes in the cylinder, at a pressure higher than the atmospheric pressure, the two or more through-holes having a diameter of 0.1 to 6.0 mm, arrayed in the circumferential direction thereof with such a configuration that the respective openings of such two or more small through-holes are arranged facing each other in the same plane;
• creating a collision of the jets of the gas-including liquid inside the cylinder;
• and
• generating micro-nano bubbles having a diameter of 60 μm or smaller, by the mutual collision of the jets of the gas-including liquid,
• wherein, in order to maintain the inflow direction of the gas-including liquid unchanged until reaching the inlet position of the through holes, the cylinder is arranged perpendicularly to an inflow direction of the gas-including liquid so as to align the openings of the through-holes with the inflow direction thereof, provided inside a nozzle case for feeding the gas-including liquid to the cylinder.