Radiation transfer in fibrous media with large size parameters

Jun Yamada, Yasuo Kurosaki

Research output: Contribution to journalArticle

Abstract

Radiation transfer in fibrous media with large size parameters has been numerically investigatad using a pseudo-continuous model. In this study, first, we examine how the scattering from a single fiber can be approximated by the specular reflection on the fiber surface and the Fraunhofer diffraction of a rectangular aperture which is considered to be a single fiber. Considering the Fraunhofer diffraction and specular reflection, we derive approximate solutions for estimating the optical characteristics of fibers, such as extinction and scattering efficiencies, which are required in this model. By comparing the approximate solutions with the conventional exact solutions, it is shown that the approximate solutions are useful at size parameters of more than 50 and at absorption indexes of more than 0.1. Furthermore, with use of the optical characteristics obtained by the approximate solutions in combination with the conventional exact solutions, radiation transfer in two types of planar fibrous media with typical fiber orientations is estimated, and the effects of the optical constant of fibers, fiber diameter and the orientation on the radiation transfer in the media are presented.

Original languageEnglish
Pages (from-to)3187-3194
Number of pages8
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume59
Issue number566
DOIs
Publication statusPublished - 1993 Jan 1
Externally publishedYes

Keywords

  • Diffraction by Fiber
  • Extinction Efficiency
  • Fibrous Medium
  • Large Size Parameter
  • Scattering Efficiency
  • Scattering by Fiber
  • Thermal Radiation
  • Thermophysical Properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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