A system may include a nanobubble generator that uses a shearing force applied by a fluid received through a fluid inlet and a negative pressure applied to an outlet by a pump to provide a vacuum-assisted shear flow nanobubble generator system. In some implementations, the system may include a nanobubble generator including a porous component including a chamber coupled to receive a gas and including a surface having a plurality of gas-permeable openings. The nanobubble generator may include an inlet and an outlet on opposing sides of the porous component to direct the fluid across the openings. The system may include a pump to apply a negative pressure to the outlet of the nanobubble generator. The negative fluid pressure and the fluid flow across the openings cooperate to form nanobubbles at low injected gas pressures, increasing the efficiency of production of nanobubble solutions with pressure sensitive gasses, such as ozone.

A beverage dispensing nozzle includes a housing having an upper end opposite a lower end, and an inlet at the upper end that is configured to be placed in communication with a source of a base liquid. The beverage dispensing nozzle further includes a chamber within the housing and in communication with the inlet. An aerator is in communication with the chamber, and the aerator includes a plate having apertures. A flavor inlet valve is in communication with a source of a flavoring and is arranged downstream of the aerator. The flavor inlet valve is configured to dispense the flavoring into the housing. The beverage dispensing nozzle additionally includes a nozzle tip arranged at the lower end of the housing.

A wine aerator includes a gas conduit having a proximal end in fluid communication with a distal end, wherein the gas conduit passes through a seal and wherein the distal end is configured to be insertable into an inside of an uncorked wine bottle. A gas source is connectable to the proximal end of the gas conduit and is in fluidic communication with the gas conduit, wherein the gas source comprises an air pump having an adjustable flow rate of at least 0.1 liters per minute up to a maximum of 20 liters per minute. A bubble-generating aeration element is disposed at the distal end of the gas conduit and in fluidic communication with the gas conduit. The bubble-generating aeration element comprises a porous material having an average pore size of at least 1 micron up to a maximum of 500 microns.

An air diffusion device is provided. The device includes a base coupled to an air supply pipe for supply of air. The base has an air discharge hole for discharge of air supplied from the air supply pipe. The device further includes a perforated cover in the form of a multi-layered stepped plate the height of which is reduced stepwise from the center to the edge. The perforated cover has a plurality of through-holes for discharge of air, and it is coupled to an upper surface of the base to cover the air discharge hole, thus defining an air guide chamber between the perforated cover and the base. The device further includes a securing mechanism configured to secure the perforated cover to the base.

A method and apparatus for injecting a gas into a liquid in which a rotating helical impeller within a draft tube submerged in the liquid creates a liquid flow within the draft tube. Gas bubbles are injected into the draft tube either above or below or alongside the helical impeller or in all three locations. The liquid is drawn into the draft tube with a superficial velocity greater than a substantially uniform terminal ascent velocity of the gas bubbles to allow entrainment of undissolved gas bubbles in the bulk liquid into the liquid being drawn into the draft tube. The gas bubbles are injected with a uniform diameter of between about 10.0 microns and about 1.0 millimeters. The small bubble size enhances the dissolution of the gas into the liquid and also allow the entrainment of the gas into the liquid being drawn into the draft tube.

An apparatus is presented that includes a body and a membrane. The body defines an externally hemispherical body portion with an orifice, as well as a channel passing through the body and terminating in the orifice. The membrane is formed at least in part of an elastomeric material and overlies a portion of the externally hemispherical body portion. The membrane defines a plurality of holes therein, and a plug that is inserted into the orifice and the channel. When submerged at the bottom of a wastewater treatment tank and in gaseous communication with a distribution conduit providing compressed gas, the apparatus may function to release bubbles into the wastewater. When the compressed gas is turned off, the apparatus acts as a check valve that stops water from entering the diffuser and the distribution conduit.

An oxygen nanobubble system may include a liquid source for liquid to be treated with oxygen nanobubbles. The system may also include a field portable oxygen nanobubble device including a portable housing, an air compressor carried by the portable housing and configured to generate compressed air, an air dryer carried by the portable housing and coupled downstream from the air compressor, an oxygen concentrator carried by the portable housing and coupled downstream from the air dryer, and a liquid pump carried by the portable housing and configured to pump liquid from the liquid source. The field portable oxygen nanobubble device may also include an oxygen nanobubble generator carried by the portable housing and coupled downstream from the liquid pump and to the oxygen concentrator to generate oxygen nanobubbles within the liquid.

An apparatus for producing nano-bubbles in a moving liquid carrier includes a conduit through which a liquid carrier can flow, a gas diffuser disposed on an inner surface of the conduit, and a funnel comprising: (i) a first open end having a first cross-sectional area that receives a moving liquid carrier; (ii) a second open end opposite the first open end defining a second cross-sectional area smaller than the first cross-sectional area and fluidly coupled to the opening of the conduit; and (iii) a wall extending from the first open end to the second open end. The funnel is configured to create turbulent flow above the turbulent threshold in the absence of external energy that allows the liquid carrier to shear gas from the outer surface of the diffuser, thereby forming nano-bubbles in the liquid carrier.

Aspects of the invention describe a tube diffuser design and associated saddle design that allow the two elements to be easily and quickly attached to each other in the field for the purpose of aerating wastewater. The tube diffuser is cylindrical and includes a gas distribution section spanning across an interior diameter of the tube diffuser. The saddle includes a pair of engagement arms that are able to couple to this gas distribution section of the tube diffuser. Once the tube diffuser is attached to the saddle and the assembly is submerged in wastewater, the saddle may be used to transport air from an air distribution pipe to the tube diffuser. The air may then be made to leave the tube diffuser as a plume of air bubbles.

A device for CO.sub.2 microbubble flooding comprises a microbubble generating device, a stirring and liquid storage device, an injection pump, a gas compressor, a gas-liquid mixer and a pressure stabilizing system, wherein the microbubble generating device adopts an integrally formed multi-layer cylindrical metal powder-sintered porous plate, and the diameters of microchannels on the porous plate are sequentially reduced from inside to outside. A solution containing additives in the storage device is stirred uniformly and then enters into a downhole gas injection base pipe through the gas-liquid mixer to be injected into a stratum, then a carbon dioxide gas compressed by the gas compressor is pumped into the downhole gas injection base pipe through the gas injection pump, and the gas generates microbubbles in situ when passing through the multi-layer porous device under the action of pressure difference.