Abstract
Thermal radiation characteristics of real surfaces of metallic materials are strongly affected by the surface roughness and the existing surface film. In actual industrial environments, the surface state is not stable, and the radiation characteristics change from time to time. In this paper, we present an idea for modelling such dynamic change in the surface state in an air-oxidation process at high temperatures. Transient behavior of reflection characteristics of the surface is described on the basis of an electromagnetic theory of interference and diffraction of radiation. Numerical computation is performed to reproduce the notable phenomenon of spectrum transition which was found in the preceding experimental investigations.
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