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

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15.7.5 Relationship between Maxwell-Stefan and Fickian Diffusivities

Since most of the diffusivity data collected in the literature are based on the Fickian diffusivity DAB and the Fickian mass-transfer coefficient k = DAB/δ, if we want to solve problems using the Maxwell-Stefan model, we must relate the Maxwell-Stefan diffusivity Image or mass-transfer coefficient Image to the Fickian diffusivity DAB or mass-transfer coefficient k. The relationship is relatively simple, although it requires activity coefficient information to calculate and in nonideal systems. ...

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