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Generalized radiative transfer equation for porous medium upscaling: Application to the radiative Fourier law

机译:多孔介质放大的广义辐射传递方程:在辐射傅里叶定律中的应用

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摘要

Many porous media cannot be homogenized as Beerian semi-transparent media. Effective extinction, absorption and scattering coefficients can indeed have no physical meaning for small or intermediate optical thicknesses. A generalized radiative transfer equation (GRTE), directly based on the extinction cumulative distribution function, the absorption and scattering cumulative probabilities and the scattering phase function is established for this optical thickness range. It can be solved by a statistical Monte Carlo approach. For a phase of a porous medium that is optically thick at local scale, the GRTE degenerates into a classical Beerian RTE. In these conditions, a radiative conductivity tensor is directly obtained, by a perturbation method, and expressed with the radiative coefficients of this RTE and temperature. As illustrations, exhaustive radiative conductivity results are given for a set of overlapping transparent spheres within an opaque phase and for opaque rod bundles.
机译:许多多孔介质不能像Beerian半透明介质一样均质。对于小的或中等的光学厚度,有效的消光系数,吸收系数和散射系数确实没有物理意义。直接针对该光学厚度范围,建立了基于消光累积分布函数,吸收和散射累积概率以及散射相位函数的广义辐射传递方程(GRTE)。可以通过统计蒙特卡洛方法解决。对于局部厚度在光学上较厚的多孔介质相,GRTE退化为经典比尔安RTE。在这些条件下,通过扰动法直接获得辐射导率张量,并用该RTE和温度的辐射系数表示。作为说明,给出了不透明相内的一组重叠透明球体和不透明棒束的详尽的辐射传导率结果。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第20期|P.4071-4081|共11页
  • 作者单位

    Laboratoire EM2C, Ecole Centrale Paris - UPR 288 CNRS, Batiment Peclet, 92295 Chatenay-Malabry Cedex, France;

    rnLaboratoire EM2C, Ecole Centrale Paris - UPR 288 CNRS, Batiment Peclet, 92295 Chatenay-Malabry Cedex, France;

    rnLaboratoire EM2C, Ecole Centrale Paris - UPR 288 CNRS, Batiment Peclet, 92295 Chatenay-Malabry Cedex, France;

    rnLaboratoire EM2C, Ecole Centrale Paris - UPR 288 CNRS, Batiment Peclet, 92295 Chatenay-Malabry Cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    radiation; radiative conductivity; porous media; upscaling; statistical physics;

    机译:辐射;辐射传导率多孔介质升级统计物理学;

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