An exhaust-gas treatment arrangement for an exhaust system of an internal-combustion engine includes a diesel internal-combustion engine. The arrangement includes a first exhaust-gas treatment unit and, downstream of the first exhaust-gas treatment unit, an exhaust-gas treatment assembly. The first exhaust-gas treatment unit and the exhaust-gas treatment assembly are arranged axially succeeding one another in the direction of a longitudinal axis of a flow path encompassing the first exhaust-gas treatment unit and the exhaust-gas treatment assembly. A hydrocarbon-feeding assembly is provided for feeding hydrocarbon into exhaust gas flowing in the flow path. The hydrocarbon-feeding assembly includes a hydrocarbon-dispensing unit dispensing hydrocarbon into the flow path downstream of the first exhaust-gas treatment unit and upstream of the exhaust-gas treatment assembly. A swirl-flow-generating unit is provided in the flow path upstream of the hydrocarbon-dispensing unit.

A liquid polymer dosing and mixing chamber and pump having a hollow chamber, a blending reactor, a progressive cavity pump, a mixing cup, a submersible actuator, and an aging cup within the hollow chamber adapted to create doses, via the progressive cavity pump, of a first substance and to mix it with one or more substances introduced into the blending reactor via one or more inlets.

Mixing systems that include a mixer housing and a plurality of roller assemblies for mixing and processing materials is disclosed. Each roller assembly includes a roller that extends between sidewalls in the mixer housing and rotates to mix an additive into the material and to carry agglomerated solids toward a discharge of the mixing system. Each of the rollers may have a protrusion geometry formed in the outer contact surface, where each protrusion geometry is complementary to an adjacent roller.

Provided is an ultra-fine bubble generator capable of efficiently generating ultra-fine bubbles in fluid. The generator is a fluid activating device including: a shaft in a cylindrical columnar shape; a tubular body provided with a hollow part to accommodate the shaft with a predetermined interval between an inner peripheral surface of the hollow part and an outer peripheral surface of the shaft; and multiple blades that are provided between the outer peripheral surface of the shaft and an inner peripheral surface of the tubular body while forming a flow path extending spirally from one end of the tubular body toward another end of the tubular body, and that generate a turbulent flow in fluid flowing in the flow path, the tubular body having an inner peripheral surface provided with multiple ribs each composed of a ridge extending in an axial direction of the shaft.

A measuring system includes a measuring chamber for receiving a sample fluid; an agitating element for agitating the sample fluid and having a variable position between first and second positions depending on a flow rate of the sample fluid; and an optical measurement arrangement with an optical measurement path for determining the position of the agitating element; wherein the measuring system determines the position of the agitating element based on a measurement signal from the optical measurement arrangement, the measurement signal being indicative of the agitating element being inside or outside of the optical measurement path.

A system for enhancing diesel fuel combustion; including: a liquid diesel fuel source; a hydrogen gas source; an oxygen source; and either (a) a mixer configured with inputs to receive each of the liquid diesel fuel, hydrogen gas and oxygen gas therein, wherein the mixer is a cylindrical container having an entrance funnel and an exit funnel, or (b) tube infuser having a liquid-gas mixing chamber with a volume up to 10 Gal, and a dwell time from gas additive/fuel mixing in the range of 15 minutes. Passive and active agitation structures are also included to facilitate mixing.

According to an example, a mixing device comprises a first chamber including a solute addition member and a first mixer, a second chamber including a second mixer, a printing fluid pump, and a controller operatively connected to the solute addition member, the pump, the first mixer, and the second mixer. The controller is to control the pump to move printing fluid towards the printing fluid tank based on a printing fluid density level in the printing fluid tank, to control the solute addition member to add solids based on the printing fluid density level, and to control the first mixer and the second mixer to mix the added solids with the printing fluid moved by the pump.

According to an example, a mixing device comprises a first chamber including a solute addition member and a first mixer, a second chamber including a second mixer, a printing fluid pump, and a controller operatively connected to the solute addition member, the pump, the first mixer, and the second mixer. The controller is to control the pump to move printing fluid towards the printing fluid tank based on a printing fluid density level in the printing fluid tank, to control the solute addition member to add solids based on the printing fluid density level, and to control the first mixer and the second mixer to mix the added solids with the printing fluid moved by the pump.

A mixer includes: a first rotary shaft provided in a housing across a first end and a second end of the housing in one direction; and a first rotary body mounted on the first rotary shaft inside the housing, the first rotary body that conveys a material supplied from a supply port toward a discharge port while mixing the material as the first rotary shaft rotates. The first rotary body includes: a first main body including a first recessed portion recessed in a helical shape; and a plurality of first scrapers provided in the first recessed portion and arranged along the first recessed portion. Each first scraper has a first inclined surface inclined so as to press the material toward the discharge port by rotation of the first rotary shaft.

A mixer includes: a first rotary shaft provided in a housing across a first end and a second end of the housing in one direction; and a first rotary body mounted on the first rotary shaft inside the housing, the first rotary body that conveys a material supplied from a supply port toward a discharge port while mixing the material as the first rotary shaft rotates. The first rotary body includes: a first main body including a first recessed portion recessed in a helical shape; and a plurality of first scrapers provided in the first recessed portion and arranged along the first recessed portion. Each first scraper has a first inclined surface inclined so as to press the material toward the discharge port by rotation of the first rotary shaft.