Abstract
In this chapter, the mechanisms related to emission and absorption (including molecular spectrum characteristics and absorption and radiation of media) as well as absorbing/scattering media radiativity are introduced first, followed by a discussion on the exchange and conservation of radiant energy. The definitions of the effective thickness of the radiating layer, absorptivity, and emissivity are important characteristics of any medium. To conclude this chapter, flue gas and flame emissivity are introduced. This chapter focuses specifically on components in the medium that are closely related to thermal radiation, how they emit and absorb thermal radiative rays, and how to quantify their characteristics in engineering practice.
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