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Radiation Characteristics of Glass Foams
Author(s) -
Fedorov Andrei G.,
Viskanta Raymond
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01629.x
Subject(s) - materials science , transmittance , radiative transfer , thermal radiation , composite material , heat transfer , radiation , flat glass , absorptance , low emissivity , porosity , combustion , opacity , coating , optics , mechanics , reflectivity , thermodynamics , chemistry , physics , optoelectronics , organic chemistry
This paper is concerned with the analysis of the radiative heat transfer in glass foams. The closed‐form analytical model for the reflectance, transmittance, and absorptance of radiation by a foam layer has been utilized to assess the resistance of radiation heat transfer from the hot combustion gases and refractories to the molten glass in the glassmelting furnace due to glass foaming. The size (radius) and shape (void fraction) of foam bubbles, their size distribution function, the scattering anisotropy, and the reflectance of the foam/glass interface have been identified as major physical parameters governing the problem. Detailed parametric calculations have been performed, and the results are reported and critically discussed with the aim of quantifying the radiation characteristics of glass foams. The findings lead to a fundamental understanding of the radiative transport in the foams, and can be used to improve the design and operation of modern glassmelting furnaces.