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Volume Scattering of Radiation in Packed Beds of Large, Opaque Spheres

机译：大的不透明球体填充床中辐射的体积散射

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摘要

A simple model is proposed for radiative properties of close-packed large, opaque spheres that accounts for nonvanishing volume of the particles, i.e., volume scattering as opposed to point scattering. It is based on the mean-beam-length concept applied to an assembly of particles, as illustrated by Mills. The resulting particle-scattering properties differ from those of classical pseudocontinuum theory based on point scattering by the simple factor of void fraction, and reduce to the point-scattering expressions in the limit of small particle volume fraction. The volume-scattering model matches detailed Monte Carlo results for extinction obtained by Kaviany and Singh and by Coquard and Baillis, which explicitly accounted for particle volume. The present model also confirms the Monte Carlo finding that the effects of nonvanishing particle volume are felt primarily in the extinction coefficient; albedo and phase function are relatively unaffected. These findings pertain only to the geometric optics regime where dependent scattering (wave coherence effects) are negligible.
机译：针对密堆积的大的不透明球体的辐射特性，提出了一个简单的模型，该模型说明了粒子的体积不变，即体积散射而不是点散射。如Mills所示，它基于应用于粒子集合的平均束长概念。所得的粒子散射特性与基于点散射的经典伪连续谱理论的不同之处在于空隙分数的简单因子，并且在小粒子体积分数的极限内将其简化为点散射表达式。体积散射模型与Kaviany和Singh以及Coquard和Baillis获得的详细的绝灭蒙特卡洛结果相符，后者明确说明了颗粒体积。本模型还证实了蒙特卡洛的发现，即消光系数的影响主要体现在消光系数上。反照率和相位函数相对不受影响。这些发现仅与几何光学方面有关，在这种情况下，相关的散射（波相干效应）可以忽略。

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  • 来源
    《Journal of Heat Transfer》 |2004年第6期|p.1048-1050|共3页
  • 作者

    Quinn Brewster;

  • 作者单位

    ASME Fellow, Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL 61801;

  • 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 热力工程、热机;
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