Numerical Simulation on Transient Behavior of Reflection Characteristics of Real Surfaces of Metallic Materials

Abstract

Thermal radiation characteristics of real surfaces of metallic materials are strongly affected by surface roughness and existing surface film. In actual industrial and natural environments, the surface state is not stable, and the radiation characteristics change with 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 real surfaces is described on the basis of an electromagnetic theory of interference and diffraction of radiation. Numerical simulation is performed to reproduce the notable phenomenon of spectrum transition which was found in a previous experimental investigation.