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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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13.14.1 Mixer Design

Our goal is to achieve high efficiency with high rates of mass transfer while using drops that are large enough to settle quickly in the settler. According to Eqs. (1-4) and (1-5), the rate of mass transfer is increased if the area between the two phases is increased. This area can be increased with reasonably large drops (~ 300 μm or larger) by increasing the volumetric fraction of the dispersed phase, although volumetric fractions above 0.6 to 0.7 are usually unstable (Treybal, 1980). The designer has significant control over which phase is dispersed and over the volumetric fraction of the dispersed phase. Volumetric fraction ϕphase_A is defined as

(13-47a)

Because of buoyancy or sedimentation forces, the dispersed phase ...

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