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Static Mixer

A static mixer or a motionless mixer is a precision engineered device for the continuous mixing of fluid materials. 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.

Mixer static

In industrial applications liquids and gases are moved through pipelines. The energy needed for this, in the form of pressure, is generated by a pump or compressor.  Static mixers are very often fitted into these pipes and the components that need to be mixed or dispensed are added to the main flow directly before the mixer.

A Static mixers have a very wide range of application within various kinds of industries and are therefore very flexible. In general applications such as technical homogeneous mixing, extraction, washing, reacting, cooling, mixing of viscous media and heating are the most common. But of course other less common applications are also possible.Mixer static-10

The type of mixer elements inside a static mixer have a number of corresponding characteristics. There are a minimum of two elements in a static mixer and they are placed one behind the other as a string. The mixing elements strand which is constructed like that gives an axial twist to the flow pattern, and each successive element has alternately a left and a right-hand twist. In addition each subsequent element is placed rotated by 90 degrees in comparison with its predecessor.

Static mixing with laminar flow

Following the laminar principle, the flow is repeatedly split into sub flows in a static mixer and subsequently brought together again. With the right pitch a balanced flow is created from outside to the inside and vice versa. This is how the medium is mixed, in a large amount of very thin layers, and the number of layers created determines the extent of the mixing.

Static mixers are an arrangement of mixing elements installed in a pipe or duct. They function without moving
parts and are used to achieve specific mixing and dispersion in continuous processes.

Static mixing with turbulent flow

The mixing effect of a static mixer following the turbulent mixing principle is mainly achieved by internal rotation and shearing away the layers within the liquid. This happens at the point where the direction of the rotation is reversed. When small percentages of shearing are required then the pitch between two rotations can be accurately adjusted to achieve this. With this pitch the rotation process is slowed down which results in extra mixing. After this reversed rotation will also start more slowly.

Homogeneity of the mixture

The homogeneity of the mixture is best measured by determining the temperature deviations or the concentration differences behind the PRIMIX static mixer. This is expressed in the theory of probability as standard deviation measured against the average. In the diagram below it is clearly visible when the medium is homogeneous.

Applications include mixing two-component adhesives and sealant;  waste water 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. Static mixer could be used for:

  • Liquid – Liquid mixing
  • Liquid-Gas mixing
  • Gas- Gas mixing

The overall system design of Static Mixer is dependent on many variables including the physical properties of fluids, mixer length, tube inner diameter, the number of elements and their geometrical design.

Features:

  • Low Pressure Drops.
  • Related Pressure Consistency at each unit height.
  • Minimum hold-up.
  • Additional stages ensure lower reflux ratios thus reducing energy consumption.
  • No moving parts.
  • No leakage.
  • Hermetically sealed.
  • Less maintenance.
  • Consumes less energy.
  • Constant operation.

The various media to be mixed or treated are described under the menu item: industries, on the website. More information about specific media can be found here: static mixers for chemical processes,static mixers for processing polymers and fibres, static mixers for food and drinks, static mixers for water treatment, static mixers for petrochemical, static mixers for pharmaceutical industry,static mixers for OEM applications

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2 Comments on Static Mixer

  1. I had no idea that a static mixer was a motionless mixer that mixed continuous fluid materials together. That is pretty cool that it can also mix gas streams as well. Thank you for all the information about static mixers. I have been curious about them since my husband and I visited a factory.

    Like

  2. thank you for visiting here and may be useful for you

    Like

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