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首页> 外文期刊>International Journal of Thermophysics >Use of a Radiation Diffusion Model for Determination of Optical and Thermal Radiative Properties of Anisotropic Silica Fiber Thermal Insulation
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Use of a Radiation Diffusion Model for Determination of Optical and Thermal Radiative Properties of Anisotropic Silica Fiber Thermal Insulation

机译：使用辐射扩散模型确定各向异性石英纤维隔热材料的光学和热辐射特性

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摘要

A radiation diffusion model is used to describe radiation transfer in highly scattering anisotropic semitransparent materials. The transmissivities of the sample disks of silica glass fiber thermal insulation of different thicknesses and orientations were measured. The samples were cut from the same insulation slab. The axis of material structure symmetry was parallel to the axis of samples in one case and perpendicular to it in the other case. The effective absorption coefficient and radiation diffusion coefficient were obtained for three wavelengths of a probing He-Ne laser, namely, 0.63, 1.15, and 3.39 μm. The spectral hemispherical absorptivity and bihemisperical reflectivity as a function of the thickness of the plane layer are calculated and presented.
机译：辐射扩散模型用于描述高散射各向异性半透明材料中的辐射传输。测量了不同厚度和方向的石英玻璃纤维热绝缘样品盘的透射率。从相同的绝缘板上切下样品。材料结构对称轴在一种情况下平行于样品的轴，而在另一种情况下垂直于样品的轴。对于探测He-Ne激光器的三个波长，即0.63、1.15和3.39μm，获得了有效吸收系数和辐射扩散系数。计算并给出了光谱半球吸收率和双半反射率与平面层厚度的关系。

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