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Journal of Porous Media
Facteur d'impact: 1.49 Facteur d'impact sur 5 ans: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2018015707
pages 721-737

BUOYANCY EFFECTS ON UNSTEADY REACTIVE VARIABLE PROPERTIES FLUID FLOW IN A CHANNEL FILLED WITH A POROUS MEDIUM

Lazarus Rundora
Department of Mathematics and Applied Mathematics, University of Limpopo, Turfloop Campus, Private Bag X1106 Sovenga 0727, South Africa
Oluwole Daniel Makinde
Faculty of Military Science, Stellenbosch University, Private Bag X2, Saldanha 7395, South Africa

RÉSUMÉ

This paper studies the unsteady reactive flow and heat transfer properties between two uniformly porous plates with suction/injection under the influence of constant pressure gradient, convective cooling, and buoyancy force. The channel is filled with a porous medium, and the fluid is assumed to be incompressible with variable viscosity and variable thermal conductivity. The coupled nonlinear partial differential equations for momentum and energy balance are numerically solved using a semi-discretization finite difference method coupled with a fourth-order Runge-Kutta-Fehlberg integration scheme to obtain the velocity and temperature profiles. The effects of the important thermophysical parameters on the flow velocity, fluid temperature, skin friction, and Nusselt number are simulated and explained. The buoyancy force was observed to increase the flow velocity, skin friction, wall heat transfer rate, and fluid temperature. Injection and suction as well as the increase in the thermal conductivity parameter were found to have a significant cooling effect on the flow system.


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