Optical Depth Effects on Aluminum Oxide Spectral Emissivity

发射率 高温计 材料科学 瑞利散射 低发射率 散射 光学 吸收(声学) 光学深度 辐射传输 温度测量 热力学 复合材料 物理 气象学 气溶胶
作者
Joseph Kalman,David J. Allen,Nick Glumac,Herman Krier
出处
期刊:Journal of Thermophysics and Heat Transfer [American Institute of Aeronautics and Astronautics]
卷期号:29 (1): 74-82 被引量:18
标识
DOI:10.2514/1.t4260
摘要

Measurements of high-temperature spectral emissivities of aluminum oxide were made within a heterogeneous shock tube over the spectral range of 650–900 nm. The spectral emissivity of optically thin micrometer-scale alumina particles scaled approximately as from 2800 to 3500 K. Results from optically thin clouds of nanoscale alumina showed that a dependence, closer to the predicted by the Rayleigh limit, is appropriate over the same spectral and temperature ranges. For temperatures below the melting point of alumina, the emissivity of nanoalumina shows a significant temperature dependence. The effect multiple scattering has on the apparent emissivity is studied, and it is determined to contribute to the discrepancy between the current and previous works. A Monte Carlo simulation showed qualitative agreement with the experimental work. It was found that, at small to moderate optical depths, scattering is responsible for a small change in the spectral distribution of particle emissivity. At large optical depths, absorption has a much stronger effect on the apparent spectral emissivity. It was determined that choice of optical depth can strongly affect the results of pyrometry measurements.
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