A hybrid random walk method for the simulation of coupled conduction and linearized radiation transfer at local scale in porous media with opaque solid phases

被引:32
作者
Vignoles, Gerard L. [1 ]
机构
[1] Univ Bordeaux, Lab Composites ThermoStruct LCTS, UMR 5801, CNRS Herakles Safran CEA UBx, F-33600 Pessac, France
关键词
Radiative heat transfer; Conductive heat transfer; Numerical method; Virtual material; EFFECTIVE THERMAL-CONDUCTIVITY; METALLIC FOAMS; HEAT-TRANSFER; PREDICTION; TRANSPORT; SEMITRANSPARENT; COEFFICIENTS; DIFFUSION; SPHERES;
D O I
10.1016/j.ijheatmasstransfer.2015.10.056
中图分类号
O414.1 [热力学];
学科分类号
摘要
Heat transfer properties from ambient up to extremely high temperatures are a key feature of advanced thermal protection and thermal exchange materials - like ceramic foams or fiber assemblies. Because of their porous nature, heat transfer rests not only on conduction in opaque solids and on convection in pores, but also on radiation trough pores. The precise knowledge of the thermal behavior of these materials in these conditions is an issue. In a "virtual material" framework, we present a computational simulation tool for heat transfer in such materials, combining solid-phase conduction and linearized radiative transfer in open or closed radiating cavities with opaque interfaces. The software is suited to working in large 3D blocks as produced e.g. by X-ray CMT or by image synthesis. An original MonteCarlo mixed random walks scheme accounting for both diffusion and radiation is presented and validated. The application to a real image of a fibrous medium is described and discussed, principally in terms of the influence of the diffusion/radiation ratio on the effective (large-scale) diffusivity tensor. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:707 / 719
页数:13
相关论文
共 48 条
  • [1] Evaluation of porous silicon carbide monolithic honeycombs as volumetric receivers/collectors of concentrated solar radiation
    Agrafiotis, Christos C.
    Mavroidis, Ilias
    Konstandopoulos, Athanasios G.
    Hoffschmidt, Bernard
    Stobbe, Pet
    Romero, Manuel
    Fernandez-Quero, Valerio
    [J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2007, 91 (06) : 474 - 488
  • [2] Almanza OA, 2000, J POLYM SCI POL PHYS, V38, P993, DOI 10.1002/(SICI)1099-0488(20000401)38:7<993::AID-POLB10>3.3.CO
  • [3] 2-A
  • [4] Innovation in concentrated solar power
    Barlev, David
    Vidu, Ruxandra
    Stroeve, Pieter
    [J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2011, 95 (10) : 2703 - 2725
  • [5] RDFI determination of anisotropic and scattering dependent radiative conductivity tensors in porous media: Application to rod bundles
    Bellet, Fabien
    Chalopin, Elie
    Fichot, Florian
    Iacona, Estelle
    Taine, Jean
    [J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2009, 52 (5-6) : 1544 - 1551
  • [6] An asymptotic preserving relaxation scheme for a moment model of radiative transfer
    Berthon, Christophe
    Charrier, Pierre
    Dubroca, Bruno
    [J]. COMPTES RENDUS MATHEMATIQUE, 2007, 344 (07) : 467 - 472
  • [7] The effective thermal conductivity of high porosity fibrous metal foams
    Calmidi, VV
    Mahajan, RL
    [J]. JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1999, 121 (02): : 466 - 471
  • [8] Radiative transfer within non Beerian porous media with semitransparent and opaque phases in non equilibrium: Application to reflooding of a nuclear reactor
    Chahlafi, Miloud
    Bellet, Fabien
    Fichot, Florian
    Taine, Jean
    [J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2012, 55 (13-14) : 3666 - 3676
  • [9] Stochastic problems in physics and astronomy
    Chandrasekhar, S
    [J]. REVIEWS OF MODERN PHYSICS, 1943, 15 (01) : 0001 - 0089
  • [10] Assessment of geometrical and transport properties of a fibrous C/C composite preform using x-ray computerized micro-tomography: Part I. Image acquisition and geometrical properties
    Coindreau, O
    Vignoles, GL
    [J]. JOURNAL OF MATERIALS RESEARCH, 2005, 20 (09) : 2328 - 2339