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DOI: 10.1615/ICHMT.2008.CHT.1030
14 pages

A. Haddad
IUSTI - CNRS UMR 6595, Polytech'Marseille, Technopôle de Château-Gombert, 5 rue, Enrico Fermi, 13453, Marseille, France

A. Benderradji
Department of Mechanical Engineering, University of Batna, Rue Boukhlouf Mohamed el Hadi, 05000 Batna, ALGERIA

R. Taher
IUSTI - CNRS UMR 6595, Polytech'Marseille, Technopôle de Château-Gombert, 5 rue, Enrico Fermi, 13453, Marseille, France

Marc Medale
Aix Marseille Universite, CNRS, IUSTI, Marseille, France

Cherifa Abid
IUSTI - CNRS UMR 7343, 13453, Marseille, France

F. Papini
Laboratoire Systemes Energetiques et Transferts Thermiques, U.A. 1168 Centre de St. Jerome Avenue Escadrille Normandie Niemen 13397 Marseille, France


Two mechanisms of roll initiation are highlighted in a horizontal channel flow, uniformly heated from below (Γ=10, Pr=7, Re=50, 0≤Ra≤105). The first mechanism is the classical one, it occurs for low Rayleigh numbers and is initiated by the lateral wall effect. The second occurs for higher Rayleigh numbers and combines the previous effect with a supercritical vertical temperature gradient in the lower boundary layer, which simultaneously triggers pairs of rolls in the whole zone in between the two lateral rolls. Consequently, the heat transfer is significantly enhanced compared to the pure forced convection case owing to the flow pattern responsible of the continuously flooding the heated wall with cold fluid.

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