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

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16.7.3 Area per Volume a and Average Drop Diameter in Mixers

To use these equations, we need to know the value of KO-EDa. Although the best approach is to determine KO-EDa from experiments, it is less expensive and more convenient to estimate this value. To do this, values of a and the mass-transfer coefficients are often estimated separately. For spherical drops in a liquid,

Image

(16-96a)

and the surface area per volume of the mixer is

Image

(16-96b)

Since the volume of n drops = nπ(average drop diameter)3/6, the volume fraction dispersed phase is

(16-96c) ...

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