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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2018022498
pages 405-420

EFFECTS OF INSERTED POROUS SQUARE CYLINDER ON HEAT- AND MASS-TRANSFER ENHANCEMENT IN A CHANNEL

Hamza Mahdhaoui
Laboratoire de Mathématiques et Physique LAMPS, Université de Perpignan via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex 9, France; Laboratoire d'Energétique et Transferts Thermique et Massique, Faculté des Sciences de Bizerte, Bizerte, Tunisie
Xavier Chesneau
Laboratoire de Mathématiques et Physique LAMPS, Université de Perpignan via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex 9, France
Ali Hatem Laatar
LETTM, Department of Physics, Faculty of Sciences of Tunis, Tunis El Manar University, 1060 Tunis, Tunisia; Department of Physics, Faculty of Sciences of Bizerte, University of the 7th November at Carthage, 7021 Jarzouna-Bizerte, Tunisia; Department of Physics, Faculty of Sciences of Tabuk, Tabuk University 71491, Saudi Arabia

ABSTRACT

We numerically investigate the effects of an inserted square porous cylinder in a horizontal channel on flow structure and heat and mass transfer. Channel walls have a thin liquid water film and are heated with a constant heat flux density. Several blockage ratio (β ) and gap distances (γ) between cylinder and channel wall are considered for study of geometric effects on heat and mass transfer. We perform a comparison between two configurations (with and without porous square cylinder) to highlight the effect of the addition. To achieve this, we solve the classical equations of forced convection and the Darcy−Brinkman−Forchheimer model. Our investigation finds an improvement in heat and mass transfer with the presence of porous cylinder. This improvement is greater with a decrease in Darcy number (Da) and when the obstacle is placed in the middle of the channel. The Sherwood number, which characterizes mass transport, is correlated by a relationship with Reynolds number and ratio blockage. We provide some design guidelines related to Da, β , and γ that can be used in an engineering environment.


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