THERMAL SCIENCE

International Scientific Journal

Tien-Chun Cheng

,

Chung-Jen Tseng

,

Ling-Chia Weng

,

Shih-Kuo Wu

COMBINED NATURAL CONVECTION AND RADIATION WITH TEMPERATURE-DEPENDENT PROPERTIES

ABSTRACT
This paper investigates the effects of temperature dependence of radiative properties of a medium on radiation and natural convection interaction in a rectangular enclosure. The radiative transfer equation is solved using the discrete ordinates method, and the momentum, continuity, and energy equations are solved by the finite volume method. Effects of the conduction-to-radiation parameter (Nr), Rayleigh number (Ra), and optical thickness are discussed. Results show that temperature dependence of radiative properties affects the temperature gradient, and hence the energy transport even in relatively weak radiation condition. On the other hand, temperature dependence of radiative properties has relatively insignificant effects on convection characteristics; even though it does affect the way that energy transfers into the system. As Nr is decreased or Ra is increased, the effects of temperature dependence of radiative properties become more significant.
KEYWORDS
radiative transfer, natural convection, temperature-dependent properties
PAPER SUBMITTED: 2016-02-25
PAPER REVISED: 2016-07-17
PAPER ACCEPTED: 2016-07-21
PUBLISHED ONLINE: 2016-08-07
DOI REFERENCE: https://doi.org/10.2298/TSCI160225171C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 2, PAGES [921 - 930]
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Combined natural convection and radiation with temperature-dependent properties

© 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