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

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15.4 Linear Driving-Force Model of Mass Transfer for Binary Systems

Unfortunately, because of the complexity of the flow fields in most separators, reactors, and other devices where interfacial mass transfer occurs, solution of the Fickian diffusion equations for binary systems is not usually feasible. In these cases we typically use the empirical linear driving-force model for mass transfer that was briefly introduced in Section 1.3. This equation [a modification of Eq. (1-4)] is

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(15-24a)

As noted in Section 15.1, the use of driving force can be misleading, since the molecules have no brain or intention to transfer, and in molecular diffusion ...

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