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Transport Processes and Separation Process Principles, Fifth Edition by Daniel H. Lepek, A. Allen Hersel, Christie John Geankoplis

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Chapter 20. Unsteady-State Mass Transfer

20.0 Chapter Objectives

On completion of this chapter a student should be able to:

Derive the equation for unsteady-state mass transfer with and without chemical reaction.

Use the Fourier series solution for unsteady-state diffusion in a flat plate with negligible surface resistance.

Use convenient charts to help solve unsteady state problems, where both internal and external resisi-tances apply.

Apply numerical, finite-difference methods for unsteady-state conduction problems.

Derive the differential equation of enery change

20.1 Unsteady-State Diffusion

20.1A Derivation of Basic Equation

In Chapters 18 and 19 we considered various mass-transfer systems where the concentration or partial pressure at any ...

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