ABSTRACT
In the previous chapter, we presented different approximations for analyzing radiative transfer in optically thin or thick translucent media, and for using mean absorption coefcients to account for spectral variations of radiative properties. For optically thin media, a series of simpler equations are given which are more convenient to use. If a medium is optically thick, it was shown that the diffusion approximation may provide reasonable results, and transfer by radiative transfer can be easily combined with heat conduction and/or convection. For regions with intermediate optical thicknesses the optically thin and thick approximations have limited accuracy, so methods of increased complexity are required. More exible but complex solution techniques are discussed in this chapter along with numerical methods for carrying out solutions.
