Borges Dos Santos Marcelo, Moura Luís Mauro, Baillis Dominique
Thermal System Laboratory (LST), Graduation Program in Mechanical Engineering, Pontificia Universidade Católica do Paraná, Curitiba 80910-215, Brazil.
Sesi Institute of Innovation, Federation of Industries of the State of Parana ISI-FIEP, Curitiba 80215-090, Brazil.
Materials (Basel). 2023 Feb 24;16(5):1891. doi: 10.3390/ma16051891.
The present work aims to characterize the radiative thermal properties albedo and optical thickness of fibers using a FTIR spectrometer. Measurements of normal/directional transmittance and normal and hemispherical reflectance are performed. The numerical determination of the radiative properties is conducted through the computational treatment of the Radiative Transfer Equation (RTE) using the Discrete Ordinate Method (DOM), together with the inverse method, which is done through Gauss linearization. As it is a non-linear system, iterative calculations are necessary, which demand a significant computational cost, and, to optimize this problem, the Neumann method is used for the numerical determination of the parameters. These radiative properties are useful to quantify the radiative effective conductivity.
本工作旨在利用傅里叶变换红外光谱仪表征纤维的辐射热特性反照率和光学厚度。进行了法向/定向透过率以及法向和半球反射率的测量。通过使用离散坐标法（DOM）对辐射传输方程（RTE）进行计算处理，并结合通过高斯线性化实现的反演方法，对辐射特性进行数值确定。由于这是一个非线性系统，需要进行迭代计算，这会带来巨大的计算成本，为优化此问题，采用诺伊曼方法对参数进行数值确定。这些辐射特性对于量化辐射有效热导率很有用。
