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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v13.i10.70
pages 945-949

DISCUSSION ON THE PAPER: VORTEX INSTABILITY OF MIXED CONVECTION BOUNDARY LAYER FLOW ADJACENT TO A NON-ISOTHERMAL HORIZONTAL SURFACE IN A POROUS MEDIUM WITH VARIABLE PERMEABILITY

D. Andrew S. Rees
Department of Mechanical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
Ioan Pop
Department of Applied Mathematics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania

RESUMO

In this Discussion we shall reflect on various aspects of the recently published paper by Elaiw and Ibrahim (2008). Their paper considers the onset of convective instabilities of a mixed convection boundary layer induced by the combined presence of a hot horizontal surface in an unbounded porous medium and an externally imposed uniform horizontal forced convective flow. These authors also adopt a power law variation in the surface temperature and allow for the effects of nonuniform porosity caused by inefficient packing of the porous medium near the horizontal surface. The primary aim of the present Discussion is to discuss the theoretical foundations of the analysis of Elaiw and Ibrahim (2008) in order to clarify them unambiguously.


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