Authors: Hidenobu Wakabayashi Toshiro Makino
Publish Date: 2011/10/21
Volume: 32, Issue: 10, Pages: 2112-2126
Abstract
For the purpose of thermal engineering applications thermal radiation phenomena of surfaces of chromium and palladium in a hightemperature airoxidation process on the basis of simultaneous measurements of spectra of normal incidence hemispherical reflectance and normal emittance in the nearultraviolet through infrared region are investigated As the results of the spectral measurements clear radiation interference is observed even in the spectra of the hemispherical reflectance of a roughfinished chromium surface in the oxidation process as well as in the spectra of the normal reflectance of a specularfinished surface The relation between the chemical reactions of oxidation and reduction of a palladium surface in the 1000 K to 1100 K range and the radiation characteristics are analyzed based on the temperature hysteresis of radiation spectra and the reaction rates of oxidation and reduction A switching function of radiation characteristics of palladium accompanied by the oxidation and reduction reactions is suggested to be applicable for engineering applications
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