Towards the development of simple methods for determining normal absorptances of open-cell foams based on opaque materials

Eurotherm Conference 105: Computational Thermal Radiation in Participating Media V

物理学;计算机科学

Guévelou, Simon^1 ; Rousseau, Benoit^1 ; Domingues, Gilberto^1 ; Vicente, Jérôme^2

CNRS, LTN UMR 6607, Ecole Polytechnique, Université de Nantes, Rue Christian Pauc, Nantes Cedex 3

44306, France^1

Aix-Marseille Université, CNRS, IUSTI UMR 7343, Marseille Cedex 13

13453, France^2

关键词: Intrinsic optical properties;    Linear relationships;    Opaque materials;    Open-cell foams;    Ray-tracing codes;    SIMPLE method;    Thermal efficiency;    Volumetric solar receivers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/676/1/012009/pdf
DOI  :  10.1088/1742-6596/676/1/012009

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The knowledge of the normal spectral absorptances of open-cell foams used as volumetric solar receivers is required to finely compute their thermal efficiencies. For this purpose, absorptances of a set of virtual open-cell foams of varying porosities, beforehand generated by using a numerical generator, are computed thanks to a ray tracing code. This work details the contribution of the intrinsic optical properties of the solid phase to the normal spectral absorptance of open-cell foams, through the statistical analysis of both the path and the events undergone by a ray, which is permitted by the ray tracing code. This study allows us to propose a robust and linear relationship that links the normal spectral absorptance to the porosity and the intrinsic optical properties of the solid phase, which is considered as optically thick.