Static Mixers

Static mixers or motionless mixers are fins, obstructions, or channels mounted in pipes, designed to promote mixing as fluid flows through the mixer. Most static mixers use some method of first dividing the flow, then rotating, channeling, or diverting the flow, before recombining it. Other static mixers create additional turbulence to enhance mixing. The power input to the mixing process is a result of pressure loss through the mixer.

Static mixers serve to put liquid in motion in order to achieve homogeneity of composition and avoid the sedimentation process. They are driven by auxiliary equipment, such as a shaft, speed reducer or electric motor, to provide mixing action. They function by forcing sediment to flow in one direction and overcome the resistance during a liquid circulation flow in open reservoirs, ditches and canals.  Static mixers are also used to intensify physical and chemical processes in liquids, particularly the processes of gas and solid dissolution. Gas dissolution is usually used in sediment / waste water / anaerobic process. The intensified mixing operation is applied in order to lengthen the distance covered by gas bubbles and to prevent smaller bubbles from joining into bigger ones. Direct drive, fast rotating mixers may also be used to prevent surface scum from coming into existence and to destroy any surface scum that has already appeared.

When determining which of the many available static mixers would be best for the given application, there are two main factors to consider, the material to be processed and the rate at which it must be processed.  If the process media or the finished product is acidic, a high-purity chemical, a pharmaceutical, of a specific polymer type, or if the mixer itself will have multi-use applications, it is best to select a lined or coated static mixer, which provides a nonstick, chemically resistant mixing area. The speed at which a mixer can process materials, also known as its flow rate, is a rated measurement based on the volume of product the mixer can process during given period of time.  If the needed flow rate is known, it is easy to find a static mixer that may operate

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