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Spectral emissivity of oxidized and roughened metal surfaces

机译:氧化和粗糙化金属表面的光谱发射率

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The effects of materials' surface oxidation and roughness on spectral emissivity have been investigated for design improvement and effective thermal management of energy systems. Experiments confirm that both surface oxidation and surface roughness affect spectral emissivity with surface oxidation having a more dominant effect. The surface oxidation layer effect is substantial at low wavelengths, and the affected wavelength range widens as oxidation temperature and time are increased. Increasing surface roughness increases spectral emissivity independent of wavelength. To describe the experimental results, a computational model based on Kirchhoff s Law is used. The dependence of optical constants on oxidation conditions were measured, and included in the computational model. Surface morphological characteristics for the roughened surfaces are described by multiple superimposed cosine function Fourier series. There is good agreement between computational predictions and experimental results.
机译:已经研究了材料表面的氧化和粗糙度对光谱发射率的影响,以改进设计和对能源系统进行有效的热管理。实验证实,表面氧化和表面粗糙度都会影响光谱的发射率,而表面氧化的作用更为明显。在低波长下,表面氧化层的作用非常明显,并且随着氧化温度和时间的增加,受影响的波长范围也会扩大。表面粗糙度的增加会增加光谱发射率,而与波长无关。为了描述实验结果,使用了基于基尔霍夫定律的计算模型。测量了光学常数对氧化条件的依赖性,并将其包括在计算模型中。粗糙表面的表面形貌特征通过多重叠加的余弦函数傅里叶级数来描述。计算预测与实验结果之间有很好的一致性。

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