An apparatus for generating and mixing gas bubbles into an aqueous solution includes a structure defining an interior fluid-flow chamber extending along a longitudinal axis between a liquid input end and a liquid output end. The structure is characterized by a gas injection portion and a mixing vane portion. The gas injection portion is located downstream from the liquid input end and upstream from the liquid output end. The gas injection portion defines a first region of the interior fluid-flow chamber and a gas injection lumen that is surrounded by the interior fluid-flow chamber. The gas injection lumen, which extends along a length of the gas injection portion, is configured to inject gas from the interior of the gas injection lumen into the surrounding interior fluid-flow chamber. The mixing vane portion extends in the downstream direction from the gas injection portion and define a second region of the interior fluid-flow chamber.

A passive gas exchange transfer apparatus for exchanging carbon dioxide from a flue gas to a water supply is disclosed. The apparatus includes several upper rods and several lower rods to hold a membrane in place. The membrane provides increased surface area for the gas and the water to meet. The upper rods may be the source of the water supply, and the lower rods may be the source of the gas. The upper rods may disperse the water onto one side of the membrane, and the lower rods may disperse the gas onto the other side. The two may therefore meet at the surface created by the membrane as gravity draws the water downward, and convection draws the gas upward.

A bubble generator includes a diaphragm, a tube, and a piezoelectric vibrator. The tube includes a first end portion and a second end portion opposite to the first end portion, and the tube is connected to the diaphragm at the first end portion so as to support the diaphragm. The piezoelectric vibrator is fixed to a ring-shaped collar extending radially outward from the tube at a position in a vicinity of the second end portion of the tube, and the piezoelectric vibrator vibrates the tube. The first end portion of the tube is joined to the water tank.

An object of the present disclosure is to improve the generation efficiency of a UFB-contained liquid in a generation apparatus having a circulation mechanism. One embodiment of the present invention is an ultra fine bubble generation apparatus including: a first tank that stores a liquid; a generation unit configured to generate an ultra fine bubble in the liquid output from the first tank; a second tank that stores the liquid output from the generation unit; and a liquid passage that inputs again the liquid stored in the second tank to the first tank, and the ultra fine bubble generation apparatus includes a blocking configuration that blocks an ultra fine bubble included in the stored liquid from being input again to the first tank.

Provided is an ultrafine bubble generating method and an ultrafine bubble generating apparatus capable of efficiently generating a UFB-containing liquid with high purity. To this end, a flow passage inner volume is varied by using a flow passage inner volume varying element, the liquid is pressurized such that the liquid passes through a narrow portion at high speed and flows into a depressurizing area.

A system and method of injecting a gas enriched and/or emulsified first liquid into a second liquid is disclosed. The injection can cause generation of a high density of bubbles having a mean diameter of a selected size. The mean diameter of the bubbles can be selected and varied based on the characteristics of the injection system.

A fluidic oscillator includes at least one inlet port (57) in communication with at least two outlets (61) via a nozzle region and two outlet conduits (58, 62), the two outlet conduits being separated from each other by a splitter region. Each outlet conduit includes a resonance chamber (60) in fluid communication with the conduit. The resonance chambers contribute to controlling the oscillation of the device. The fluidic oscillator is operatable in an acoustic switching mode.

A fluidic oscillator includes at least one inlet port (57) in communication with at least two outlets (61) via a nozzle region and two outlet conduits (58, 62), the two outlet conduits being separated from each other by a splitter region. Each outlet conduit includes a resonance chamber (60) in fluid communication with the conduit. The resonance chambers contribute to controlling the oscillation of the device. The fluidic oscillator is operatable in an acoustic switching mode.

In one configuration, a hydroponic system for enriching a liquid with gas-bubbles is disclosed. The system may include at least one reservoir configured to temporarily store the gas-bubble enriched liquid. Each of the at least one reservoir may include an associated inlet port and an associated outlet port fluidically coupled with each other via a liquid-flow line. The system includes one or more pumps configured to cause movement of the liquid along the liquid-flow line, a gas supply feeding a gas (in one configuration, oxygen from a gas concentrator), and a gas-bubble generator provided on the liquid-flow line. The gas-bubble generator may be fluidically coupled to the gas supply to receive gas from the gas supply. The gas-bubble generator may be configured to generate a plurality of individual gas-bubbles of the gas received from the gas supply and mix with the liquid stream flowing via the gas-bubble generator.

A micro-bubble generating system according to an embodiment of the present invention may include an electrolytic bath configured to generate primary micro-bubbles; a water supply hose which is connected to an outlet end of the electrolytic bath; and a micro-bubble generating device which is connected to the outlet end of the water supply hose to generate secondary micro-bubbles having a smaller diameter than the primary micro-bubbles.