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 resistances apply

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

  • Derive the differential equation of energy change

20.1 Unsteady-State Diffusion

20.1A Derivation of a Basic Equation

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

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