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 investigated 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
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume59
Issue number566
Publication statusPublished - 1993 Oct
Externally publishedYes

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Radiation
fibers
Fibers
radiation
specular reflection
Diffraction
Scattering
fiber orientation
Optical constants
Fiber reinforced materials
scattering
diffraction
extinction
estimating
apertures

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Radiation transfer in fibrous media with large size parameters. / Yamada, Jun; Kurosaki, Yasuo.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 59, No. 566, 10.1993, p. 3187-3194.

Research output: Contribution to journalArticle

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