Radiative Heat Transfer and Selective Emission in Planar Slab Coatings on Hot Emissive Substrates

摘要

The spectral radiance of infrared radiation emitted from a smooth planar coating in thermal contact with a hot substrate is analyzed by radiative transport theory. The solution of the radiative transfer equation, which governs the spectral radiance within the coating, is used to determine whether selective (nonblackbody) emitter coatings in infrared banded regions can be obtained in the limiting cases of optically thin or thick regimes. For the reader not interested in the mathematical details of this report, the key conclusions are given following Eq. (22). The results are presented in a summary that shows how varying the optical thickness of the coating, the coating material, and the substrate parameters affect the emitted radiation.