Pipeline Mixing

Static mixers are widely used in situations where continuous in-line or pipeline mixing is required. Table 9.17 shows that applications span the entire spectrum from laminar to turbulent flow regimes, and they cover a wide variety of mixing processes involving the blending of gas-gas... 

Coefficient of Variation. The coefficient of variation (CoV) and other measures used to describe mixedness are defined in Chapter 3, where details of the analysis are discussed, and reviewed in the context of pipeline mixing... 

When the flow is laminar, either single or multiphase, there is only one design class option static or motionless mixers. Other pipeline mixing devices described for turbulent flow are not usable for even the simplest mixing applications in the laminar regime. All rely on turbulence and cannot function at low Reynolds numbers. The only alternative technology is in-line dynamic mixers, which include extruders, rotor-stator mixers, and a variety of rotating screw devices. None of these has the benefits of simplicity and the little or no maintenance characteristic of static mixers. In-line mechanical mixers are discussed briefly later in the chapter. 

One of the two most popular approaches to pipeline mixing in turbulent flow involves the use of side injection tees. The other is the use of motionless static mixers (which are discussed later). The most complete work on side tees is by Forney and Lee (1982). They and others have found that the momentum of... 

Etchells, A. W., and D. G. R. Short (1988). Pipeline mixing a user s view turbulent blending, Proc. 6th European Mixing Conference, Pavia, Italy, pp. 539-544. 

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