Disclosed is a composite gypsum board comprising a set gypsum core disposed between face (e.g., Manila) and back (e.g., Newsline) cover sheets. The set gypsum core is formed from a core slurry comprising stucco, water, and optional additives, such as foaming agent, migrating starch, accelerator, retarder, dispersant, etc. A dense layer formed from a dense layer slurry comprising stucco, water, fiber (e.g., paper fiber), and optionally, strength-enhancing starch, is disposed between the core and the face paper. The dense layer slurry contains a greater concentration of fiber, and optionally, strength-enhancing starch, than the core slurry, but the concentration of one or more other additives (e.g., accelerator, retarder, dispersant, or combinations thereof) is lower or the same in the dense slurry as compared with the core slurry. Also disclosed is a method of making board using one board mixer. In embodiments, paper fiber is added to water to form a suspension. The suspension is introduced, while in a non-laminar state, into the dense slurry. Further disclosed is apparatus, such as an extractor and an additive injection system, which can be a part of a cementitious slurry mixing and dispensing assembly.

A compressed air foam mixing system that has a mixing device connected to a discharge port of a tank. The mixing device receives fluid from the tank and pressurized air from the tank or alternatively directly from a source of pressurized air. The fluid and pressurized air are combined within the mixing device to form a foam.

The present invention provides a catalytic cracking reactor comprising a conduit, configured to allow the passage of a flow of catalyst particles, and an injection zone comprising a ring of feed injectors extending inwardly from the wall of reactor and angled to inject feed into the flow of catalyst particles, characterised in that the reactor also comprises a contacting device protruding into the reactor from the inner wall of said reactor upstream of the injection zone.

A fluid mixer apparatus can include an annular ring defining a fluid flow path configured for a first fluid through the annular ring. The annular ring can include one or more fluid inlets circumferentially disposed on an exterior surface of the annular ring, the one or more fluid inlets configured to receive a second fluid different than the first fluid. The fluid mixer apparatus can include a central hub and a plurality of helical airfoils positioned inside the annular ring and connected to both of the annular ring and the central hub. In some examples, each helical airfoil of the plurality of helical airfoils can include: a plurality of perforations in fluid communication with the one or more fluid inlets to introduce the first fluid into the second fluid; and an airfoil surface perturbation positioned adjacent to or rearward of the plurality of perforations.

A compressed air foam mixing system that has a mixing device connected to a discharge port of a tank. The mixing device receives fluid from the tank and pressurized air from the tank or alternatively directly from a source of pressurized air. The fluid and pressurized air are combined within the mixing device to form a foam.

The present disclosure generally provides methods of providing at least metastable radical molecular species and/or radical atomic species to a processing volume of a process chamber during an electronic device fabrication process, and apparatus related thereto. In one embodiment, the apparatus is a gas injection assembly disposed between a remote plasma source and a process chamber. The gas injection assembly includes a body, a dielectric liner disposed in the body that defines a gas mixing volume, a first flange to couple the gas injection assembly to a process chamber, and a second flange to couple the gas injection assembly to the remote plasma source. The gas injection assembly further includes one or more gas injection ports formed through the body and the liner.

The present application discloses a gas cooling apparatus and a heat furnace. The gas cooling apparatus comprises a pipeline structure. The pipeline structure defines a gas flow channel and a liquid channel; the gas flow channel is used for circulating a high-temperature gas; and the liquid channel is located outside the gas flow channel and is provided with a liquid spraying part communicated with the gas flow channel. The pipeline structure is further provided with a gas spraying part communicated with the gas flow channel; and a liquid sprayed from the liquid spraying part can be atomized under the action of the high-temperature gas in the gas flow channel and the high-pressure gas sprayed from the gas spraying part. The gas cooling apparatus has the advantages of simple structure, convenient use, rapid cooling rate for a high-temperature gas, and less use of a cooling liquid.

Methods and apparatus for gas mixing are provided. In some embodiments, a gas mixing apparatus includes: a tubular body having a wall extending longitudinally from a first end to a second end and having an outer side and an inner side that surrounds a central through opening and defining a first flow path between the first end and the second end; one or more inlet holes formed in the outer side of the wall; a plurality of exit holes formed in the inner side of the wall and communicating with the central through opening; and a plurality of longitudinal channels formed within the wall fluidly coupled to the one or more inlet holes and the plurality of exit holes, wherein the one or more inlet holes, the plurality of exit holes, and the plurality of longitudinal channels define a recursive second flow path that intersects with the first flow path.