Experimental study on the radiative properties of open-cell porous ceramics
Experimental study on the radiative properties of open-cell porous ceramics
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开孔多孔陶瓷辐射性能的实验研究
DOI：
10.1016/j.solener.2017.04.002
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发表时间：
2017
期刊：
影响因子：
6.7
通讯作者：
Du Xiaoze
中科院分区：
文献类型：
--
作者：
Wei Gaosheng;Huang Pingrui;Xu Chao;Chen Lin;Ju Xing;Du Xiaoze
开孔多孔陶瓷是一种理想的容积式吸热材料，详细了解其热性能，特别是辐射性能，对于容积式太阳能接收器的设计和改进具有重要意义。本文通过实验研究了开孔多孔陶瓷的辐射特性。采用傅里叶变换红外光谱仪（FTIR）测量了不同孔隙率和孔密度的开孔多孔陶瓷样品在2.5 ~ 25 μm红外波段的光谱透过率。通过对测试结果的分析，确定了光谱消光系数和Rosseland消光系数，结果表明多孔陶瓷的辐射性能与其微观结构参数密切相关，而材料类型对其影响不大。光谱消光系数和Rosseland消光系数都随着细胞密度的增加和孔隙度的减小而增加。根据实验结果，提出了两个与窗口直径和孔隙率相关的经验关系式，用于预测开孔多孔陶瓷的Rosseland消光系数。最后，研究了不同多孔陶瓷的辐射导热系数。
Open-cell porous ceramic is an ideal volumetric heat absorbing material, and understanding in detail the thermal properties of the material, particularly its radiative properties, is of primary importance for the design and improvement of volumetric solar receivers. This work investigates the radiative properties of open-cell porous ceramic through experiment. Fourier transform infrared spectroscopy (FTIR) was applied to measure the spectral transmittance of open-cell porous ceramic samples with different porosities and cell densities in infrared wavelengths between 2.5 and 25 μm. The results were analyzed to determine the spectral extinction coefficient and Rosseland extinction coefficient, which showed that the radiative properties of porous ceramic are strongly dependent on its microstructure parameters, while the type of material has little influence. The spectral extinction coefficient and Rosseland extinction coefficient both increased with increasing cell density and decreasing porosity. Based on the experimental results, two empirical correlations related to the window diameter and porosity were proposed to predict the Rosseland extinction coefficient of open-cell porous ceramics. Finally, the radiative thermal conductivities of different porous ceramics were studied.