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Static mixer

A static mixer is a precision engineered device for the continuous mixing of fluid materials, without moving components. Normally the fluids to be mixed are liquid, but static mixers can also be used to mix gas streams, disperse gas into liquid or blend immiscible liquids. The energy needed for mixing comes from a loss in pressure as fluids flow through the static mixer. One design of static mixer is the plate-type mixer and another common device type consists of mixer elements contained in a cylindrical (tube) or squared housing. Mixer size can vary from about 6 mm to 6 meters diameter. Typical construction materials for static mixer components include stainless steel, polypropylene, Teflon, PVDF, PVC, CPVC and polyacetal. The latest designs involve static mixing elements made of glass-lined steel.

Static mixer
A promotional sample of a helical static mixer enclosed in a clear tubular housing
UsesMixing
Related itemsMagnetic stirrer, vortex mixer

Plate type

Plate-type static mixer

In the plate type design mixing is accomplished through intense turbulence in the flow.

Housed-elements design

Depiction of how flow division and radial mixing can occur in a static mixer
Flow division in a static mixer that uses baffles is a function of the number of elements in the mixer

In the housed-elements design the static mixer elements consist of a series of baffles made of metal or a variety of plastics. Similarly, the mixer housing can be made of metal or plastic. The housed-elements design incorporates a method for delivering two streams of fluids into the static mixer. As the streams move through the mixer, the non-moving elements continuously blend the materials. Complete mixing depends on many variables including the fluids' properties, tube inner diameter, number of elements and their design. The housed-elements mixer's fixed, typically helical elements can simultaneously produce patterns of flow division and radial mixing:

  • Flow division: In laminar flow, a processed material divides at the leading edge of each element of the mixer and follows the channels created by the element shape. At each succeeding element, the two channels are further divided, resulting in an exponential increase in stratification. The number of striations produced is 2n where 'n' is the number of elements in the mixer.
  • Radial mixing: In either turbulent flow or laminar flow, rotational circulation of a processed material around its own hydraulic center in each channel of the mixer causes radial mixing of the material. Processed material is intermixed to reduce or eliminate radial gradients in temperature, velocity and material composition.

A common application is mixing nozzles for two-component adhesives (e.g., epoxy) and sealants (see Resin casting). Other applications include wastewater treatment and chemical processing. Static mixers can be used in the refinery and oil and gas markets as well, for example in bitumen processing or for desalting crude oil. In polymer production, static mixers can be used to facilitate polymerization reactions or for the admixing of liquid additives.

The static mixer traces its origins to an invention for a mixing device filed on Nov. 29, 1965 by the Arthur D. Little Company. This device was the housed-elements type and was licensed to the Kenics Corporation and marketed as the Kenics Motionless Mixer. Today, the Kenics brand is owned by National Oilwell Varco. The plate type static mixer patent was issued on November 24, 1998 to 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.[citation needed]

  1. Paul, Edward L. (2004). Handbook of Industrial Mixing-Science and Practice. Hoboken NJ: John Wiley & Sons. pp. 399 section 7-3.1.4. ISBN 0471269190.
  2. Albright, Lyle F. (2008). Albright's Chemical Engineering Handbook. Boca Raton FL: CRC Press. p. 682. ISBN 978-0824753627.
  3. Gieseke, Thomas. "An Evaluation of the Hydrodynamics Mechanisms Which Drive the Performance of the Westfall Static Mixer". pp 28. US Naval Undersea Warfare Center and Westfall Manufacturing. Retrieved19 May 2016.
  4. Bor, Thomas P., "The Static Mixer as a Chemical Reactor", British Chemical Engineering, Vol. 16, No. 7, 1971.
  5. "Westfall Variable Flow Static Mixer Enables Bitumen Pumping via Pipeline". Marketwire. December 4, 2012.
  6. "Markets & Applications". Sulzer Chemtech. Archived from the original on 2012-06-30. Retrieved2011-07-04.
  7. C. D. Armeniades, et al.,U.S. Patent 3,286,992 Mixing Device issued November 29, 1965
  8. Arons, Irv (2008-07-23). "ADL Chronicles: The Disposable "Motionless Mixer"". Adlittlechronicles.blogspot.com. Retrieved2011-07-04.
  9. U S Patent Office. "US Patent Static Mixer".

Static mixer
Static mixer Language Watch Edit A static mixer is a precision engineered device for the continuous mixing of fluid materials without moving components 1 Normally the fluids to be mixed are liquid but static mixers can also be used to mix gas streams disperse gas into liquid or blend immiscible liquids The energy needed for mixing comes from a loss in pressure as fluids flow through the static mixer 2 One design of static mixer is the plate type mixer and another common device type consists of mixer elements contained in a cylindrical tube or squared housing Mixer size can vary from about 6 mm to 6 meters diameter Typical construction materials for static mixer components include stainless steel polypropylene Teflon PVDF PVC CPVC and polyacetal The latest designs involve static mixing elements made of glass lined steel Static mixerA promotional sample of a helical static mixer enclosed in a clear tubular housingUsesMixingRelated itemsMagnetic stirrer vortex mixerDesign EditPlate type Edit Plate type static mixer In the plate type design mixing is accomplished through intense turbulence in the flow 3 Housed elements design Edit Depiction of how flow division and radial mixing can occur in a static mixer Flow division in a static mixer that uses baffles is a function of the number of elements in the mixer In the housed elements design the static mixer elements consist of a series of baffles made of metal or a variety of plastics Similarly the mixer housing can be made of metal or plastic The housed elements design incorporates a method for delivering two streams of fluids into the static mixer As the streams move through the mixer the non moving elements continuously blend the materials Complete mixing depends on many variables including the fluids properties tube inner diameter number of elements and their design The housed elements mixer s fixed typically helical elements can simultaneously produce patterns of flow division and radial mixing Flow division In laminar flow a processed material divides at the leading edge of each element of the mixer and follows the channels created by the element shape At each succeeding element the two channels are further divided resulting in an exponential increase in stratification The number of striations produced is 2n where n is the number of elements in the mixer Radial mixing In either turbulent flow or laminar flow rotational circulation of a processed material around its own hydraulic center in each channel of the mixer causes radial mixing of the material Processed material is intermixed to reduce or eliminate radial gradients in temperature velocity and material composition Applications EditA common application is mixing nozzles for two component adhesives e g epoxy and sealants see Resin casting Other applications include wastewater treatment and chemical processing 4 Static mixers can be used in the refinery and oil and gas markets as well for example in bitumen processing 5 or for desalting crude oil In polymer production static mixers can be used to facilitate polymerization reactions or for the admixing of liquid additives 6 History EditThe static mixer traces its origins to an invention for a mixing device filed on Nov 29 1965 by the Arthur D Little Company 7 This device was the housed elements type and was licensed to the Kenics Corporation and marketed as the Kenics Motionless Mixer 8 Today the Kenics brand is owned by National Oilwell Varco The plate type static mixer patent was issued on November 24 1998 to Robert W Glanville of Westfall Manufacturing 9 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 citation needed See also EditThermal cleaningReferences Edit Paul Edward L 2004 Handbook of Industrial Mixing Science and Practice Hoboken NJ John Wiley amp Sons pp 399 section 7 3 1 4 ISBN 0471269190 Albright Lyle F 2008 Albright s Chemical Engineering Handbook Boca Raton FL CRC Press p 682 ISBN 978 0824753627 Gieseke Thomas An Evaluation of the Hydrodynamics Mechanisms Which Drive the Performance of the Westfall Static Mixer pp 28 US Naval Undersea Warfare Center and Westfall Manufacturing Retrieved 19 May 2016 Bor Thomas P The Static Mixer as a Chemical Reactor British Chemical Engineering Vol 16 No 7 1971 Westfall Variable Flow Static Mixer Enables Bitumen Pumping via Pipeline Marketwire December 4 2012 Markets amp Applications Sulzer Chemtech Archived from the original on 2012 06 30 Retrieved 2011 07 04 C D Armeniades et al U S Patent 3 286 992 Mixing Device issued November 29 1965 Arons Irv 2008 07 23 ADL Chronicles The Disposable Motionless Mixer Adlittlechronicles blogspot com Retrieved 2011 07 04 U S Patent Office US Patent Static Mixer Retrieved from https en wikipedia org w index php title Static mixer amp oldid 997347983, wikipedia, wiki, book,

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