An eductor type gas to gas aspirator having improved entrainment efficiency includes a motive gas nozzle configured with a distal tip having an arcuate internal profile that converges in a downstream direction. The arcuate internal profile preferably has sinusoidal convergence curvature. In a preferred embodiment, the length L.sub.s of the nozzle tip is between 2D and 4D where D is the diameter of said outlet orifice, and the distance L.sub.d between nozzle outlet orifice and the upstream end of and out let barrel passage is between 0 and D.

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.

The present inventive concept relates to a venturi nozzle apparatus. Specifically, an embodiment of the present inventive concept provides a venturi nozzle apparatus which mixes water and a gas to dissolve the gas in the water, the venturi nozzle apparatus including a housing in which a flow pipe through which at least one of the water and the water in which the gas is dissolved selectively flows and a bypass pipe which communicates with the flow pipe to selectively bypass at least one of the water and the water in which the gas is dissolved flowing through the flow pipe are disposed, an injector unit which is detachably inserted into the flow pipe of the housing and configured to selectively receive the gas and the water to dissolve the gas in the water, and a valve member which is inserted into the bypass pipe of the housing and configured to cause at least one of the water and the water in which the gas is dissolved to flow to at least one of the flow pipe of the housing and the bypass pipe of the housing.

A mixing device for mixing first and second substances to form a mixed substance includes a housing having first and second inlets for first and second substances and an outlet for the mixed substance. A flow channel between the first inlet and the outlet and has a flow axis therebetween. The flow channel has a Venturi section having a side wall. A lateral feed opening in the side wall in a first lateral direction is connected to the second inlet, and the opening has a feed axis in said first lateral direction substantially perpendicular to the flow axis of the flow channel. Upstream from the lateral feed opening the side wall of the Venturi tube section forms a first constricted part having a first width in the first lateral direction and a second width perpendicular to the first lateral direction. The second width is larger than the first width.

A cleaning device (100) according to the present invention is constituted by including in a cleaning nozzle member (21) provided inside a cleaning tank (2): a large pipe diameter part (211) that supplies a cleaning fluid (31) pressure-fed from a retention tank (3); a small pipe diameter part (212) that increases the speed of a flow rate for the cleaning fluid (31) flowing in the large pipe diameter part; a conical pipe diameter part (213) that generates a fluid that includes minute bubbles by cavitation; and a guide pipe diameter part (214) for accommodating an object (5) to be cleaned. The cleaning fluid (31) is ejected to the entirety of the object (5).

An aerosol-generating system is provided, including: an aerosol-forming substrate; and a venturi element including an airflow channel, the airflow channel including an inlet portion, a central portion, and an outlet portion, and the inlet portion is configured to converge towards the central portion with an inlet angle of between 1? and 19?, and the outlet portion is configured to diverge from the central portion.

An ejector has an interior nozzle, an exterior nozzle, a suction part, a mixing part and a diffuser part. The interior nozzle and the exterior nozzle are arranged coaxially with each other. A driving fluid is supplied to the interior nozzle and/or the exterior nozzle. The suction part is arranged on an outer periphery of the exterior nozzle and sucks a suction fluid by a driving fluid jet ejected from the interior nozzle and/or the exterior nozzle. A mixing part mixes the driving fluid jet with the suction fluid, and supplies a mixture fluid. The diffuser part reduces a flow speed of the mixture fluid and ejects the mixture fluid outside. An outlet part of the interior nozzle is arranged at an upstream side of the ejector more than an outlet part of the exterior nozzle along the axial direction of the ejector.

There is provided a loop flow type bubble generation nozzle capable of improving the bubble generation efficiency compared to conventional nozzles without reducing the bubble generation efficiency even when liquid containing impurities is used. A loop flow type bubble generation nozzle 10 includes a tubular bottomed member 1 having a circular cross section and a tubular member 2 which is fitted into the other end side of the bottomed member 1. A substantially cylindrical space surrounded by the bottomed member 1 and the tubular member 2 serves as a loop flow type gas-liquid stirring and mixing chamber 6. The tubular member 2 has, on the center thereof, an inflow hole 7 which is capable of allowing liquid and gas to flow therein, and a first jet hole 8a and a second jet hole 8b which are capable of jetting liquid and gas. The inflow hole 7 is formed in a tapered shape whose diameter continuously expands from the first jet hole 8a toward the loop flow type gas-liquid stirring and mixing chamber 6. A plurality of cut-away parts 7a are formed on an end face of the inflow hole 7, the end face facing the loop flow type gas-liquid stirring and mixing chamber 6.

A Venturi device for introducing a second fluid into a first fluid includes a T-joint, a converging component, and a diverging component. The T-joint component includes a first elongated tube extending along a first direction and a second elongated tube extending along a second direction being perpendicular to the first direction. The converging component is shaped and dimensioned to slip fit within a first through-opening of the first elongated tube through a first inlet port and has a cross-section that decreases along the first direction from the first inlet port to an inner section of the first though-opening. The diverging component is shaped and dimensioned to slip fit within the first through-opening of the first elongated tube through an outlet port and has a cross-section that increases along the first direction from the inner section of the first though-opening to the outlet port. The converging component is coaxially aligned with the diverging component along the first direction.

A turbine assisted Venturi mixer has a first and second fluid channels leading to a Venturi for mixing fluids separately introduced via the channels. The mixer is assisted with a compressor powered by a turbine turned by fluid flow through the second channel and acting between the channels to pump fluid through the first channel.