A static mixer is a precision engineering device for continuously mixing liquid materials. Usually the liquid to be mixed is liquid, but a static mixer can also be used to mix the gas stream, spreading the gas into liquids or mixing the incompressible liquid. The energy required for mixing comes from the loss of pressure during the fluid flow through the static mixer. One of the design of a static mixer is a plate-type mixer and other common device type consisting of a mixer element contained in a cylinder (tube) or a quadratic housing. The size of the mixer can vary from about 6 mm to 6 meters in diameter. Common construction materials for static mixer components include stainless steels, polypropylene, Teflon, PVDF, PVC, CPVC and polyacetal. The latest design involves a static mixing element made of glass-coated steel.
Video Static mixer
Design
In mixing the type of plate the design is carried out through intense turbulence in the flow.
In the design of static elements mixer elements consist of a series of baffles made of metal or various plastics. Similarly, the housing of the mixer can be made of metal or plastic. The element-placed design combines methods to transmit two fluid streams to a static mixer. As the flow moves through the mixer, the immobile element continuously blends the material. Complete mixing depends on many variables including fluid properties, tube diameter, number of elements and design. The elements of a fixed element occupied by propulsion elements can simultaneously produce a flow-sharing pattern and radial mixing:
- Current division: In laminar flow, the processed material is divided across the front end of each mixer element and follows the channel created by the shape of the element. In each subsequent element, the two channels are subdivided, resulting in an exponential stratification increase. The number of generated striations is 2 n where 'n' is the number of elements in the mixer.
- Radial mixing: In a turbulent flow or laminar flow, the rotation of the processed material around its own hydraulic center in each mixer channel causes radial mixing of the material. The processed material is mixed to reduce or eliminate the radial gradient in the temperature, velocity and composition of the material.
Maps Static mixer
Apps
Currently, static mixers are used for a variety of different applications across many different market segments. A common application is to mix two adhesive components (eg, epoxy) and sealant (see Resin casting). Other applications include wastewater treatment and chemical processing. The static mixer can be used in refineries and oil and gas markets as well, for example in bitumen processing or for desalting crude oil. In the production of polymers, static mixers may be used to facilitate polymerization reactions or for mixing liquid additives.
History
The static mixer traces its origins to an invention for the blending device proposed on 29 November 1965 by Arthur D. Little Company. This device is a home-element type and is licensed to Kenics Corporation and marketed as a Motionless Mixer Kenics. Today, the Kenics brand is owned by National Oilwell Varco. Static patent type mixer plate was issued on 24 November 1998 for Robert W. Glanville of Westfall Manufacturing; However, there are also other suppliers of static mixers, Fluitec Georg AG, including Sulzer Chemtech Ltd., Verdermix, Koflo Corporation, Statiflo, KOMAX Systems Inc., and MVV srl.
See also
- Thermal cleanup
- Static Mixer
References
Source of the article : Wikipedia
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