Disclosed is a device for contactlessly mixing fluid present on the upper surface of the slide, where the device comprises a first nozzle array and a second nozzle array, the first nozzle array adapted to impart a bulk fluid flow to the fluid present on the upper surface of the slide, and the second nozzle array adapted to impart at least a first regional fluid flow to at least a portion of the fluid present on the upper surface of the slide

According to examples, an apparatus may include a hopper having side walls, a bed positioned within the side walls, and a porous membrane supported above the bed. The porous membrane may have a plurality of pores having sizes that are between about 5 microns and about 15 microns and having a density of about 10 and about 30 percent of a material forming the porous membrane. A space between the bed and the porous membrane is to be pressurized with a gas and the gas is to flow through the porous membrane to fluidize particulate material provided on the porous membrane. The apparatus may also include a drain opening extending through the porous membrane and a drain aperture extending through the bed.

Fine-bubble-producing aeration units and large-bubble-producing (or other mechanical) mixing units are interspersed with each other in a given body of water to be treated. The two different types of units are independently controlled to independently regulate degrees of aeration and mixing in the given body of water.

A system for performing a gas-liquid mass transfer includes a container bounding a compartment and having a top wall, a bottom wall, and an encircling sidewall extending therebetween. A tube has a first end and an opposing second end, the first end of the tube being disposed within the compartment of the container. A nozzle is disposed within the compartment of the container and has at least one outlet, the nozzle being coupled with the tube so that a gas can be passed through the tube and out the at least one outlet of the nozzle. The nozzle is sufficiently buoyant so that when a fluid is disposed within the compartment of the container, the nozzle floats on the fluid.

An apparatus (100) for mixing a liquid (160) containing particulates (106, 108) comprising: a vessel (102) for containing the liquid (160) that includes a sidewall (120) and a bottom (124); and an impeller (300) rotating about a substantially vertical axis (X-X), said impeller (104): adapted for submerging below the liquid surface (162) by a distance that is approximately one-tenth to one-half of the height of the liquid (129); and include at least two annually spaced apart blades (310) extending radially outwardly of the vertical axis (X-X), the blades (310) comprising back-swept blades that are pitched substantially parallel to the vertical axis (X-X), at least 50% of the length of each blade (310) comprising an angled section (312) extending through a chord angle of 20 to 60 degrees; to produce (a) an inner, upward flow region (164) located along said vertical axis (X-X), (b) a transition flow region (166) located around the impeller (300) in which liquid moves radially outwardly toward the vessel sidewall (120), and (c) an outer, downward flow region (168) located along the sidewall (120).

This gas distributor comprises at least one elongate crosspiece including two side walls, inclined on their upper parts, connected to one another in their respective upper parts and defining a gas circulation housing between them emerging downward. The gas distributor includes at least one reinforcing member arranged in the housing defined in the elongate crosspiece, the reinforcing member including a central vertical plate that extends longitudinally in said housing and at least one bracket fastened transversely between the central vertical plate and the side wall of the elongate crosspiece.

A technique is provided for incorporating pneumatic control in centrifugal microfluidics. The technique involves providing a chip controller that has pressurized fluid supply lines for coupling one or more pressurized chambers of the controller with ports of a microfluidic chip. At least part of the chip controller is mounted to a centrifuge for rotation with the chip. A flow control device is provided in each supply line for selectively controlling the pressurized fluid supply, and is electrically controlled. Bubble mixing, on and off-chip valving, and switching are demonstrated.

An apparatus and methods of mixing materials in a silo that includes a mixing chamber (2) with an outlet (23) the bottom and an inlet hose (4) connected to an inlet opening at the top; a sieve (16) at the top of the mixing chamber above the inlet opening and below the outlet opening to prevent contact between a particulate mixing material and the top of the mixing chamber and to allow dust through; a pump system (18) to create a negative pressure region at the top of the mixing chamber; and an air manifold assembly (8), which includes an air pressure manifold (10) having an air nozzle (12) to introduce an air stream into the mixing chamber and an air manifold cover (14) to prevent contact between the particulate mixing material and the air pressure manifold, and to allow a particulate mixed product material to pass to the mixing chamber outlet.

A device for mixing powders by a cryogenic fluid, characterised in that it comprises: a chamber for mixing the powders, comprising a cryogenic fluid, provided with means for forming a fluidised powder bed; a chamber for supplying powders in order to allow the powders to be introduced into the mixing chamber; a chamber for supplying cryogenic fluid in order to allow the cryogenic fluid to be introduced into the mixing chamber; a system for generating vibrations in the fluidised powder bed; and a system for controlling the system for generating vibrations.

The present invention is directed to an applicator having an agricultural product mechanical conveying system which transfers particulate material from one or more source containers to application equipment on demand, and meters the material at the application equipment. The conveying system includes a pneumatic agitation system operably connected to the tanks of the applicator to agitate the particulate material disposed within the tanks in order to reduce the formation of agglomerations and/or bridges of particles within the tanks. The pneumatic agitation system includes a number of nozzle connected to each tank that are in turn connected to a pressurized air source and a controller. The controller is operable to selectively cause pressurized air to flow into the tanks through the nozzles to agitate the particulate material positioned therein, thereby breaking up and agglomerations of material within the tanks.