Transport Processes and Separation Process Principles, 5th Edition

Chapter 14. Principles of Unsteady-State Heat Transfer

14.0 Chapter Objectives

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

• Derive the equation for unsteady-state conduction with and without internal heat-generation

• Calculate the Biot number (N_Bi), which compares the relative values of internal conduction resistance and surface convective resistance to heat transfer

• Use the Biot number as a guide when choosing the appropriate solution method to solve unsteady state problems

• Use the lumped capacity method to solve unsteady state problems where N_Bi < 0.1

• Use equations to solve unsteady state problems with larger Biot numbers for a flat plat of thickness 2H or for a semi-infinite solid

• Use convenient charts to help solve unsteady ...