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Virtual enclosure model for thermal radiation extinction inside porous materials with closed cell structure

机译:具有封闭单元结构的多孔材料内部热辐射消光的虚拟外壳模型

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摘要

We present a virtual enclosure model for thermal radiation extinction in porous materials. The geometrical structure of the model is based on series of cuboid enclosures. The key conjecture of the model is that the mean free distance of photons emitted from the real cell can be applied for finding a virtual enclosure with opaque, isothermal and diffusive surfaces. This leads into the applicability of the view factor analysis of the virtual structure providing an efficient method for evaluation of the otherwise highly complex radiation interaction between large numbers of consecutive unit cells. The model is applied to analyzing how the cell configuration affects radiative extinction properties of materials with a wide range of complex refractive indices. It is shown, e.g., that an optimum cell configuration (size, wall thickness, aspect ratio) which minimizes radiative power can be detected for materials with sufficiently high ratio between the real and imaginary part of the refractive index. In addition, it is shown that for materials with high radiation extinction properties closed cell structures have superior radiation extinction properties as compared to open cell structures.
机译:我们提出了一种虚拟外壳模型,用于多孔材料中的热辐射消光。模型的几何结构基于一系列长方体外壳。该模型的主要推测是,可以将从真实单元中发出的光子的平均自由距离应用于发现具有不透明,等温和扩散表面的虚拟外壳。这导致虚拟结构的视图因子分析的适用性,为评估大量连续单位晶胞之间原本高度复杂的辐射相互作用提供了一种有效的方法。该模型用于分析单元结构如何影响具有广泛复折射率的材料的辐射消光特性。例如,示出了对于折射率的实部和虚部之间具有足够高的比率的材料,可以检测到使辐射功率最小的最优单元结构(尺寸,壁厚,纵横比)。另外,已经表明,对于具有高辐射消光性能的材料,闭孔结构与开孔结构相比具有优异的辐射消光性能。

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  • 作者单位

    Aalto University, School of Engineering, Department of Energy Technology, Applied Thermodynamics, PO Box 14400, FI-00076 Aalto, Finland;

    Aalto University, School of Engineering, Department of Energy Technology, Applied Thermodynamics, PO Box 14400, FI-00076 Aalto, Finland;

    Aalto University, School of Electrical Engineering, Department of Electrical Engineering and Automation, Finland;

    Aalto University, School of Engineering, Department of Energy Technology, Applied Thermodynamics, PO Box 14400, FI-00076 Aalto, Finland;

    Aalto University, School of Engineering, Department of Energy Technology, Applied Thermodynamics, PO Box 14400, FI-00076 Aalto, Finland;

    Aalto University, School of Science, Department of Applied Physics and COMP CoE, PO Box 11000, Fl-00076 Aalto, Finland,Brown University, Department of Physics, PO Box 1843, Providence, RI 02912, USA;

  • 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

    Thermal radiation; Porous material; Thermal insulation; Radiative properties; Scattering;

    机译:热辐射;多孔材料保温;辐射特性;散射;

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