This paper deals with a numerical investigation on natural convection heat transfer in a long horizontal annular region formed with a heated inner cylinder and a cooled outer cylinder. Identifying the annular region geometrically by its radius ratio, it is divided into two subregions: a thicker outer subregion is filled with a porous material saturated by air, whereas a thinner inner subregion is clear. Based on the general Darcy–Brinkman–Forchheimer model for flow in porous media, numerical calculations with the control volume method produce the velocity and temperature fields of the air motion in the two subregions. The baseline case corresponds to an annular region of same dimensions, but filled completely with a porous material saturated by air. Upon articulating the physical properties of a porous material with the clear gap size, the analyst will be able to tune those conditions that are conducive to heat transfer reduction across the concentric two-cylinder configuration. The outcome of this paper is equivalent to the determination of superior thermal insulation performance using lesser porous material. In other words, this paper boils down to beneficial energy conservation together with money savings in the purchase of the thermal insulation.
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Natural Convection Reduction in a Composite Air/Porous Annular Region With Horizontal Orientation
M. Ait saada,
M. Ait saada
Faculté de Génie Mécanique et de Génie des Procédés,
Université des Sciences et de la Technologie Houari Boumediene
, B.P. 32, El Alia, Bab Ezzouar 16111, Algeria
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S. Chikh,
S. Chikh
Faculté de Génie Mécanique et de Génie des Procédés,
Université des Sciences et de la Technologie Houari Boumediene
, B.P. 32, El Alia, Bab Ezzouar 16111, Algeria
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A. Campo
A. Campo
Department of Mechanical Engineering,
e-mail: campanto@yahoo.com
The University of Vermont
, Burlington, VT 05405
Search for other works by this author on:
M. Ait saada
Faculté de Génie Mécanique et de Génie des Procédés,
Université des Sciences et de la Technologie Houari Boumediene
, B.P. 32, El Alia, Bab Ezzouar 16111, Algeria
S. Chikh
Faculté de Génie Mécanique et de Génie des Procédés,
Université des Sciences et de la Technologie Houari Boumediene
, B.P. 32, El Alia, Bab Ezzouar 16111, Algeria
A. Campo
Department of Mechanical Engineering,
The University of Vermont
, Burlington, VT 05405e-mail: campanto@yahoo.com
J. Heat Transfer. Feb 2009, 131(2): 022601 (8 pages)
Published Online: December 12, 2008
Article history
Received:
October 31, 2007
Revised:
July 10, 2008
Published:
December 12, 2008
Citation
Ait saada, M., Chikh, S., and Campo, A. (December 12, 2008). "Natural Convection Reduction in a Composite Air/Porous Annular Region With Horizontal Orientation." ASME. J. Heat Transfer. February 2009; 131(2): 022601. https://doi.org/10.1115/1.2993544
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