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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i5.60
pages 573-597

Augmentation or Suppression of Natural Convective Heat Transfer in Horizontal Annuli Filled with Air and Partially Filled with a Porous Matrix Layer

M. Ait Saada
Faculté de Génie Mécanique et de Génie des Procédés, USTHB, B.P.32, El Alia, Bab Ezzouar 16111
Salah Chikh
USTHB, Faculty of Mechanical and Process Engineering, LTPMP, Alger 16111, Algeria
Antonio Campo
Department of Mechanical Engineering, The University of Vermont, Burlington, VT 05405, USA

RÉSUMÉ

A numerical investigation on natural convection heat transfer is devoted to a horizontal annular region configuration partially filled with a porous material. Insertion of an air gap conducive to heat transfer reduction or insertion of a porous substrate conducive to heat transfer enhancement are considered in the present work. Firstly, a parametric study focuses on the derived economic aspects related to an insulating situation in order to find the optimal conditions in terms of thermal performances. Numerical predictions demonstrate that an air gap separating a concentric porous layer from the annular space may lead to better thermal insulation characteristics when compared to the baseline case of a fully porous annulus. Secondly, when the porous substrate is used as an alternative to surface extension, numerical results demonstrate that substantial heat transfer augmentation can be achieved particularly with the insertion of moderate-to-thick porous materials. As far as economy is concerned, a thin porous layer can yield a better heat transfer improvement under high Rayleigh number conditions.


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