Tomography based pore-level optimization of radiative transfer in porous media

被引：53

作者：

Akolkar, Anupam ^{[1
]}

Petrasch, Joerg ^{[1
]}

机构：

[1] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2011年 / 54卷 / 23-24期

关键词：

Monte Carlo Ray Tracing; Radiative transfer; Tomography; Image processing; Optimization; Two-flux method; HEAT-TRANSFER; SCATTERING COEFFICIENTS; IDENTIFICATION; COMBUSTION; ABSORPTION;

D O I：

10.1016/j.ijheatmasstransfer.2011.06.017

中图分类号：

O414.1 [热力学];

学科分类号：

070201 [理论物理];

摘要：

A non-energy-partitioning Monte Carlo Ray Tracing (MCRT) model is employed to optimize radiative transfer in porous media. The pore level geometry is incrementally modified using 3D equivalents of image manipulation algorithms such as erosion, dilation, opening, and closing. Subsequently, direct, pore-level analysis of radiative transfer is carried out for each modification step to optimize the pore-level geometry for maximum absorptance. Results have been obtained for an opaque, diffusely or specularly reflecting solid phase within a non-participating void phase. Model media studied are: (i) reticulate porous ceramics (RPCs) and (ii) packed beds of CaCO3 particles. The extinction coefficient and the forward scattering fraction have been determined for the media via a two-flux model of radiative transfer. Optimum porosities for maximizing absorptance at given medium thicknesses are then obtained from the analytical model. For the RPC, the forward scattering fraction varies between 0.38 and 0.57, and the extinction correlation coefficient varies between 9.56 and 7.03. For the packed CaCO3 particle bed, the forward scattering fraction varies between 0.6 and 0.72, and the extinction coefficient varies between and 2.84 and 2.14. (C) 2011 Published by Elsevier Ltd.

引用

页码：4775 / 4783

页数：9

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