期刊
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
卷 20, 期 1, 页码 35-46出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/ijcre-2020-0146
关键词
anisotropic extinction coefficients; porous media; radiation transport
资金
- Fondo Sectorial CONACYT-SENER-Sustentabilidad Energetica [207450, 120]
This study presents a simplified analysis method for estimating anisotropic, non-homogeneous extinction coefficients in porous solids based on pore morphology and size distribution. The model is fast and accurate, with a local geometric criterion to determine its applicability range.
This manuscript presents a simplified analysis for estimating anisotropic, non-homogeneous extinction coefficients in porous solids as a function of the pore morphology and size distribution. The model contains two main simplifications: (1) the pore network consists of hollow interspersed spheres and cylinders, and (2) each surface exchanges radiation (through diffuse emission) only with itself and adjacent surfaces. The model yields photon flight length (PFL) probability distribution functions (PDFs), describing Beerian and non-Beerian anisotropic extinction processes. The method is three orders of magnitude faster than the Monte Carlo Ray Tracing Method (MCRT), yielding Root Mean Square Errors between 0 and 35% for the PFL-PDFs and 0-25% for the anisotropic extinction coefficients. Finally, this work presents a local geometric criterium determining whether the model applies to some given area of the porous solid, so it remains useful even when not applicable to the whole domain.
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