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

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15.2.4 Steady-State Binary Fickian Diffusion and Mass Balances with Convection

To simplify the previous analyses, we assumed that there was no convection in the z direction. But in practical separation and other mass-transfer systems, this is obviously a special case. How do we analyze diffusion when there is also convection in the z direction?

A useful analogy is to consider a molecule (for example, sugar) moving in a person’s body at the same time she walks across the room. The overall movement of the sugar will be dominated by her movement in the room (the room serves as a fixed frame of reference, and the flux measured in this frame is N). To study the movement of the sugar, we first look at the flux in her body, using the body as the reference ...

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