Mixing devices power consumption

Figure 3.25. Plot of dimensionless numbers of power consumption iVp versus mixing time Ny with the range of different mixing devices with and without baffles [propeller (I), anchor (II), flat-blade turbine (III), and helical ribbon impeller (IV)]. (Adapted from Zlokarnik, 1967.)...

A technique which avoids this problem is to decouple mixing from extrusion. An arrangement used by the author is shown in Figure 8.17 [17]. The primary objective was to obtain data on the influence of cavity size of the cavity transfer mixer (CTM) (described in Section 9.3). At the same time a variety of mixers were evaluated in an attempt to compare this particular mixer with a range of known mixing devices. An equal length of screw and a plain annulus (like the Couette model in Chapter 2) were used as controls. In addition to mixing performance, data was required on power consumption, temperature rise, and pressure drop. 

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