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

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15.2.2 Steady-State Binary Fickian Diffusion and Mass Balances without Convection

For it to be useful, we need to couple Fick’s law with mass balances. The first case considered is steady-state diffusion with no convection in the direction of diffusion. This is an important practical case for measuring diffusion coefficients, studying steady-state evaporation and steady-state permeation of gases and liquids in membranes, and in design of distillation and some other separation processes. The second case we consider is unsteady diffusion with no convection in the direction of diffusion, which is of practical significance in controlled-release drug delivery and in some batch reactors and separation processes.

The classic steady-state diffusion problem ...

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