Dispersion high speed disc

High Speed Disc dispersion systems. Idealized flow in mixing vessel and typical installations. Reproduced by permission of Dlaf AG from house literature. 

The latest combination of high speed disc dispersers and small media mills offer the pesticide manufacturer versatile high capacity tools which require minimum plant floor space and installation problems. 

High speed dispersion vertical mixers which are fitted with a variable speed drive and a toothed disc at the end of the vertical shaft. This type suits the lower viscosity plastisols used in wall and floor coverings. 

The highest shear rates in a mixing vessel are close to the blades. Local impeller shear rates are proportional to tip speed (iiDN) and are impeller specific. Disc turbines produce higher shear rates than propellers or hydrofoils (Figure 9.11). Certain applications, such as gas dispersion, require high shear rates while suspension polymerization requires a low shear rate. The vessel average shear rate, as described by the Metzner and Otto equation (9.7), is dependent on rotational speed, not tip speed. 

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