THERMAL SCIENCE

International Scientific Journal

Mourad Moderres

,

Toufik Benmalek

,

Aberkan Sofiane

,

Abderrahmene Ghezal

,

Said Abboudi

,

Abderrahmene Benbrik

DOUBLE-DIFFUSIVE NATURAL CONVECTION IN A CAVITY WITH AN INNER CYLINDER WRAPPED BY A POROUS LAYER

ABSTRACT
This paper reports a numerical study of double-diffusive natural convection through an annular space delimited by a square cylinder on the outside and a cylindrical cylinder on the inside covered by a porous layer. The Darcy-Brinkmann-Forchheimer is used for modeling flow in both fluid and porous areas. The annular space is partially or completely filled with an isotropic porous medium. A finite volume method, using the Patankar-Spalding technique is used for solving the discretization of the dimensionless equations governing the problem. The effects of simultaneously applied thermal and solutal buoyancy forces on heat and mass transfer are shown in the results for a large range of buoyancy ratios, Rayleigh number, and thermal conductivity. Streamlines, isotherms, and iso-concentrations are presented to analyze the flow structure transition from mass species dominated to thermal dominated flow. Results show that the buoyancy ratio can change the flow pattern and the increased thermal conductivity ratio can improve heat and mass transfer. A good agreement was obtained between the present results and those published were found.
KEYWORDS
natural convection, Porous layer, Buoyancy ratio, Double-diffusive convection, heat and mass transfer
PAPER SUBMITTED: 2021-02-15
PAPER REVISED: 2021-04-19
PAPER ACCEPTED: 2021-04-21
PUBLISHED ONLINE: 2021-06-05
DOI REFERENCE: https://doi.org/10.2298/TSCI201112202M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [1841 - 1853]
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Double-diffusive natural convection in a cavity with an inner cylinder wrapped by a porous layer

© 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