In order to analyse the radiant heat transfer characteristics of a concave source, two vital concepts must be clearly understood. The first is called the apparent emissivity Ea and is a function of both the local total emissivity E and of the geometry of the source. Although the total emissivities of ordinary substances range between zero and one, the two extremeties never occur. Surface emissivities which approach these values in the limit, must be created mechanically from materials in the range 0
College and Department
BYU ScholarsArchive Citation
Duke, Richard K., "Radiant Flux Distribution from Concave Radiation Sources" (1963). Theses and Dissertations. 7117.
Heat — Radiation and absorption