Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition

4.10. INTRODUCTION TO RADIATION HEAT TRANSFER

4.10A. Introduction and Basic Equation for Radiation

1. Nature of radiant heat transfer

In the preceding sections of this chapter we have studied conduction and convection heat transfer. In conduction, heat is transferred from one part of a body to another, and the intervening material is heated. In convection, heat is transferred by the actual mixing of materials and by conduction. In radiant heat transfer, the medium through which the heat is transferred usually is not heated. Radiation heat transfer is the transfer of heat by electromagnetic radiation.

Thermal radiation is a form of electromagnetic radiation similar to X rays, light waves, gamma rays, and so on, differing only in wavelength. It ...