Unimolar counter-diffusion

Unimolar Counter-Diffusion. Only one component A of the mixture is transferred to or from the interface between the two phases, and the total flow is the same as the flow of A, thus ... 

Equations 15.9 and 15.10 are empirical with respect to the definition of the mass transfer coefficients, but the form of the equations is based on molecular diffusion theory. Applying the theory to a multi-component mixture where each component has a distinct diffusivity is impracti-cally complex and must rely on diffusivity data for all the components in the mixture. To derive usable equations from the diffusion theory, certain simplifying assumptions must be made. The basis for the derivation of Equations 15.9 and 15.10 is to assume that mass transfer takes place either as equimolar counter diffusion or as unimolar diffusion under dilute conditions. 

In equimolar counter diffusion or unimolar dilute diffusion, V and L are assumed constant, allowing Equations 15.22 and 15.23 to be written as... 

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See also in sourсe #XX -- [ ]

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