THERMAL SCIENCE

International Scientific Journal

STUDY OF GEOMETRICAL CHARACTERISTICS EFFECTS ON RADIATION PROPERTIES IN HIGH POROSITY FIBROUS POROUS MEDIA USING THE PORE-SCALE SIMULATION AND TWO-FLUX MODEL

ABSTRACT
In the present study, the radiation properties of a high porosity fibrous medium which is used in catalytic heaters were estimated. The calculation process was based on an inverse method using pore scale simulation and two-flux model. The results showed a good agreement with available experimental results. The effects of geometrical parameters including the solid volume fraction, fibers orientation, and diameter on the radiation properties were investigated. By increasing the solid share in the fibrous porous medium, the extinction coefficient increased, in which the absorption growth rate was higher than the scattering growth rate. The effect of the fibers angle on the scattering was greater than its effect on the absorption. For each porosity, an extinction coefficient could be defined in which, by increasing the fibers diameter, the extinction coefficient would not be reduced any more. The solid volume fraction, fibers diameter, and orientation were found to be the most effective geometric parameters on the radiation properties, respectively.
KEYWORDS
PAPER SUBMITTED: 2018-07-22
PAPER REVISED: 2018-12-09
PAPER ACCEPTED: 2018-12-19
PUBLISHED ONLINE: 2019-01-13
DOI REFERENCE: https://doi.org/10.2298/TSCI180722009H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 2, PAGES [1299 - 1310]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence