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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

EXPERIMENTAL EVALUATION OF RADIATION REFLECTION CHARACTERISTICS OF REAL SURFACES FOR HEAT TRANSFER COMPUTATION

Toshiro Makino
Department of Engineering Physics and Mechanics Kyoto University, Japan

Hidenobu Wakabayashi
Department of Engineering Physics and Mechanics Kyoto University, Japan

Shin-ya Okada
Department of Engineering Physics and Mechanics Kyoto University

Abstract

This paper aims to clarify thermal radiation reflection characteristics of rough surfaces and to establish a technique for determining the parameters for heat transfer computation of radiation energy exchange among surfaces. Directional distribution of bidirectional reflectance ρ of metallic surfaces of root-mean-square roughness Σ=0-1~1 to the irradiation of a visible laser of wavelength λ=0.6328 µm and to that of an infrared laser of λ=3.39 µm is investigated experimentally. The optical roughness (Σ/λ) ranges from 0.028 to 1.27. A measure of specular reflection is presented. A model for describing the ρ -distribution is presented, and the experimental results of the ρ -distribution are analyzed to drive the values of input parameters for heat transfer computation quantitatively and systematically.