Agitation motionless mixers

The commonly used types of mixing equipment can be placed in the broad categories (1) mechanical agitators, (2) inline motionless mixers, (3) tank jet mixers, and (4) miscellaneous. The nature and type of agitator used depends upon the scale and type of mixing and upon the fluids being mixed. The broad classes of impellers are ... 

Motionless mixers (and inline mixers in general) present an alternative to the more traditional agitated vessel. These devices are particularly useful for the continuous processing of chemicals but are also incorporated as part of a batch system in pump-around loops. 

Fluid viscosity and volume to be mixed are the most significant factors. Propellers viscosity <3000 mPa-s volumes <750 m Turbines and paddles viscosity <50,000 mPa-s volumes <75 m Liquid jets viscosity <1000 mPa s volumes >750 m Air agitation viscosity <1000 mPa-s volumes >750 mT Anchors viscosity <100,000 mPa-s Re <10,000 volumes <30 mT Kneaders viscosity 4,000 to 1.5 x 10 mPa s volumes 3 to 75 m Roll mills viscosity 10 to 200,000 mPa s volumes 60 to 450 m For viscosity >10 consider extruders, Banbury mixers, and kneaders. Paddle reel/stator-rotor gentle mechanical mixing for coagulation, viscosity <20 mPa s volumes large. Motionless mixers viscosity ratio <100,000 1 continuous and constant flow rates residence times <30 min and flow rate ratio of <100 1. Other related sections are size reduction (Sections 16.11.8.1 and 16.11.8.3), reactors (Section 16.11.6.10), and heat transfer (Section 16.11.3.5). 

Mixing, as a term, is generally used in three different senses i. It corresponds to the blending of two or more components, i.e. it is a unit operation carried out to unify two or more material streams or charges into one. a. Mixing is the synonym of agitation or stirring, i.e. it is an action carried out e.g. by stirrers or motionless mixers to induce relative displacements of various parts of the treated material by convection, shear, dispersion, random movements, turbulence, etc. 

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