THERMAL SCIENCE

International Scientific Journal

Geniy Vladimirovich Kuznetsov

,

Alexander Eduardovich Nee

MODELLING OF THE CONJUGATE NATURAL CONVECTION IN A CLOSED SYSTEM WITH THE RADIANT HEATING SOURCE RADIANT ENERGY DISTRIBUTION BY LAMBERT’S COSINE LAW

ABSTRACT
Various types of emitters are often used as energy sources in real engineering systems and technological processes. Investigations of heat transfer basic laws in such systems are of interest. We conducted mathematical modelling of conjugate heat transfer in a closed rectangular cavity under conditions of radiant energy source operating. The 2-D problem of conjugate natural convection in vorticity stream function-temperature dimensionless variables has been numerically solved by means of the finite difference method. Radiant energy distribution along the gas-wall interfaces was set by Lamberts’ cosine law. We obtained fields of temperature and stream functions in a wide range of governing parameters (Rayleigh number 104 ≤ Ra ≤ 106, the length of radiant heating source 0.15 ≤ D ≤ 0.6). Then we analyzed how heat retaining properties of finite thickness heat conducting walls made of different materials affect the heat transfer intensity. Differential characteristics distribution showed significant non-uniformity and non-stationarity of the conjugate heat transfer process under study.
KEYWORDS
infrared emitter, natural convection, conjugate heat transfer, mathematical modelling, Lambert’s cosine law
PAPER SUBMITTED: 2016-01-20
PAPER REVISED: 2016-08-04
PAPER ACCEPTED: 2016-10-24
PUBLISHED ONLINE: 2016-11-06
DOI REFERENCE: https://doi.org/10.2298/TSCI160120256K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 1, PAGES [591 - 601]
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Modelling of the conjugate natural convection in a closed system with the radiant heating source radiant energy distribution by Lambert’s cosine law

© 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