The present disclosure is generally directed to a design geometry of a venturi or an ejector that is optimized in systems and methods for increasing the operating range of the venturi or the ejector in a fuel cell system. The present disclosure is also generally directed to fuel cell systems and methods for sizing and/or integrating a recirculation blower with a venturi or an ejector in a fuel cell or fuel cell stack. The present disclosure is further generally directed to systems and methods of operating a fuel cell system comprising more than one venturi or ejectors during transient operations.

An eductor for mixing a primary fluid with a flowable secondary substance includes a primary inlet for the primary fluid, a secondary inlet for the secondary substance, an outlet and a suction chamber, A converging inlet nozzle is provided, which is arranged between the primary inlet and the suction chamber so that the primary fluid can flow from the primary inlet into the suction chamber. An outlet nozzle is provided between the suction chamber and the outlet, through which the primary fluid and the secondary substance can flow to the outlet, and the secondary inlet is provided at the suction chamber so that the secondary substance can flow from the secondary inlet into the suction chamber.

Devices, systems, and methods for siphoning heat exchange or reaction for solids production are disclosed. Passing a contact fluid through a siphoning device, wherein the siphoning device is made of a contact fluid inlet, a carrier fluid inlet, and an outlet, and wherein the contact fluid passes through the contact fluid inlet, inducing a siphon in the carrier fluid inlet. This siphon then siphons a carrier fluid through the carrier fluid inlet and into the contact fluid. The carrier fluid is, in part, made of a first component. The carrier fluid and the contact fluid mix. This mixing produces a product solid, wherein the product solid is produced from the first component by desublimation, condensation, solidification, crystallization, precipitation, reaction with the contact fluid, or a combination thereof of at least a portion of the first component. The product solid passes through the outlet.

A multi-stage aeration generator, comprising a generator body (1). A pressure monitoring device (2) and a venturi nozzle (3) are installed on the generator body (1). The generator further comprises: a capillary tube (4) and a concentric tube (5). One end of the capillary (4) is connected to the venturi nozzle (3), and the other end thereof is connected to the concentric tube (5). Also disclosed is a wastewater treatment method using the multi-stage aeration generator.

A removable cartridge for use with a liquid diffusion device is provided. The removable cartridge includes a cartridge housing defining an internal housing cavity, partially filled with a liquid to be diffused, and a diffusion head positioned within the internal housing cavity with a venturi device for generating diffused liquid from the liquid contained in the internal housing cavity. The diffusion head defines at least a portion of a gas supply conduit that extends from a bottom end of the removable cartridge to the venturi device through the liquid to be diffused to enable the venturi device to be supplied with pressurized gas from an external source via the bottom end of the removable cartridge.

Carbonation duct (1) for blending a gas and a beverage. The carbonation duct (1) includes a tubular structure (12) surrounding a compression structure (13), the compression structure (13) longitudinally positioned inside the tubular structure (12) and setting a pathway (14) for the flowing of the beverage along the carbonation duct (1). The compression structure (13) includes external diameters (P,C,G) sequentially defining a convergence path (8), a mixture path (19) and a slowdown path (20) along the carbonation duct (1), wherein, in the convergence path (8), the carbonation duct (1) includes a gas entry portion (9) for gas injection in the pathway (14), and the tubular structure (12) defines a turbilionating projection (10) establishing a carbonation duct (1) mixture diameter (F).

A liquid aerating device is presented. The device includes a first inner channel through which air flows in a first direction, a second inner channel extending substantially parallel to the first inner channel, wherein liquid flows through the second inner channel in a second direction that is opposite of the first direction, and an aeration chamber. The aeration chamber is connected to the first inner channel and the second inner channel, and positioned such that the air flows into the first inner channel from the aeration chamber and the liquid flows out of the second inner channel into the aeration chamber.

A microbubble generating device that is capable of generating microbubbles from contaminated water is provided. The microbubble generating device 10 according to the present invention includes a liquid flow path 11 through which a pressurized liquid flows, a discharge path 12 through which generated microbubbles and a liquid are discharged, a throat part 13 that connects the liquid flow path 11 and the discharge path 12, and that has a flow path area smaller than the area of the liquid flow path 11 or the discharge path 12, and a gas supply path 14 for supplying a gas into the liquid flow path 11 or the throat part 13, wherein the gas supply path 14 has an exit end 143 that opens toward the downstream side of the liquid flow.

A removable cartridge for use with a liquid diffusion device is provided. The removable cartridge includes a cartridge housing defining an internal housing cavity, partially filled with a liquid to be diffused, and a diffusion head positioned within the internal housing cavity with a venturi device for generating diffused liquid from the liquid contained in the internal housing cavity. The diffusion head defines at least a portion of a gas supply conduit that extends from a bottom end of the removable cartridge to the venturi device through the liquid to be diffused to enable the venturi device to be supplied with pressurized gas from an external source via the bottom end of the removable cartridge.

A liquid aerating device is presented. The device includes a first inner channel through which air flows in a first direction, a second inner channel extending substantially parallel to the first inner channel, wherein liquid flows through the second inner channel in a second direction that is opposite of the first direction, and an aeration chamber. The aeration chamber is connected to the first inner channel and the second inner channel, and positioned such that the air flows into the first inner channel from the aeration chamber and the liquid flows out of the second inner channel into the aeration chamber.