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Effects of thermal boundary conditions, surface radiation andaspect ratio on thermal performance in “T” shallow cavity

Published online by Cambridge University Press:  21 November 2014

Adel Sahi ,
Djamel Sadaoui ,
Bachir Meziani  and
Kacem Mansouri
Adel Sahi
Affiliation:
Laboratoire de Mécanique, Matériaux et Energétique (L2ME), Faculté de Technologie, Université A. Mira de Bejaia, 06000 Bejaia, Algérie
Djamel Sadaoui
Affiliation:
Laboratoire de Mécanique, Matériaux et Energétique (L2ME), Faculté de Technologie, Université A. Mira de Bejaia, 06000 Bejaia, Algérie
Bachir Meziani*
Affiliation:
Laboratoire de Physique Théorique (LPT), Faculté des sciences, Université A. Mira de Bejaia, 06000 Bejaia, Algérie
Kacem Mansouri
Affiliation:
Laboratoire Energétique, Mécanique et Ingénieurie (LEMI), Université B. Bouguerra de Boumerdes, 35000 Boumerdes, Algérie
*
a Corresponding author:[email protected]
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Abstract

The main objective of this article is to study the effect of 2D coupled mode freeconvection with surface radiation on the fluid flow behavior in an air filled partitionedand shallow cavity subjected to isothermal or insulated boundary conditions. Thedimensionless governing equations under Boussinesq approximation are coupled with aradiative model through the boundaries conditions and solved by the finite volume method.The numerical results are discussed in terms of streamlines, isotherms, convective andradiative Nusselt numbers along the cover plate for various aspect ratios (a, b and c), emissivities andRayleigh number. These results highlighted the condition of the enclosure performance andrevealed among other that isothermal boundaries induce better convective heat exchangecompared to adiabatic cases. Also, it is noticed that varying aspect ratio(a) causesstrong influence on both Nusselt numbers compared to the aspect ratios (b) and (c). The increase of(ϵo) raisesNuconvand decreases Nuradslightly. Whereas, an increase of (ϵC) leads to minorchanges in Nuradwhen (b) or(c) vary,this effect becomes appreciable with increasing (a).

Keywords

Free convectionsurface radiationisothermal boundaryinsulated boundaryNusselt number
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 6 , 2014 , pp. 557 - 568
Copyright
© AFM, EDP Sciences 2014

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