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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.2015007477
pages 765-783

NATURAL CONVECTION HEAT TRANSFER IN A DIFFERENTIALLY HEATED ENCLOSURE WITH ADIABATIC PARTITIONS AND FILLED WITH A BINGHAM FLUID

Karim Ragui
Laboratoire des Phenomenes de Transfert, Faculte de Genie Mecanique et de Genie des Procedes, Universite des Sciences et de la Technologie Houari Boumediene BP, 32 El Alia, 16111 Bab Ezzouar, Algiers, Algeria
Youb Khaled Benkahla
Faculté de Génie Mécanique et de Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene USTHB, B.P. 32, El-Alia Bab-Ezzouar, 16111 Algiers, Algeria
Nabila Labsi
Laboratoire des Phenomenes de Transfert, Faculte de Genie Mecanique et de Genie des Procedes, Universite des Sciences et de la Technologie Houari Boumediene BP, 32 El Alia, 16111 Bab Ezzouar, Algiers, Algeria
Abdelkader Boutra
Laboratoire des Phenomenes de Transfert, Faculte de Genie Mecanique et de Genie des Procedes, Universite des Sciences et de la Technologie Houari Boumediene BP, 32 El Alia, 16111 Bab Ezzouar, Algiers, Algeria

RÉSUMÉ

The present numerical study deals with two-dimensional natural convection in a differentially heated square enclosure, with centrally located partitions and offset partitions. The cavity is considered to be completely filled with a yield fluid obeying the rheological model of Bingham. The governing equations were solved using a code based on the finite volume method. The code has been validated for both cases of a Newtonian and non-Newtonian fluid, after comparison between the present results and those given in the literature.
In order to investigate the effect of a set of parameters, i.e., the partitions height and thickness, on heat and flow behaviors, the Prandtl number is taken equal to 20, the Rayleigh number is fixed at 106, and the Bingham number covers the range from 0 to 20. The results show, on the one hand, that the average Nusselt number is a decreasing function of the Bingham number and that all parameters related to geometrical dimensions of partitions exert a crucial effect on the flow field and heat transfer, on the other hand. Moreover, it has been pointed out that the position of such partitions has an important effect on both fluid flow and heat transfer and that the partitions thickness enhanced heat transfer.