ARTICLE:

• TURBULENT RAYLEIGH-BENARD CONVECTION OF A SUPERCRITICAL FLUID IN A CLOSED CAVITY  download article

Gilbert Accary
Holly-Spirit University of Kaslik, Faculty of Science and Computer Engineering, Department of Science and Technology, B.P. 446, Jounieh, Lebanon

Patrick Bontoux
Département de Modélisation Numérique, Institut de Recherche sur les Phénomènes Hors Equilibre, Unité Mixte de Recherche CNRS 6594, 1, rue Honnorat, 13003 Marseille, France

I. Raspo
MSNM-GP, Marseille, France

B. Zappoli
CNES, Toulouse, France

ABSTRACT

This paper reports direct numerical simulations of the Rayleigh-Bйnard convection in a fluid close to its gas-liquid critical point, for a Rayleigh number varying between 10⁶ and 10⁸. We consider a cubic box containing a generic supercritical fluid (SCF) and heated from below. Initially, the fluid is on its critical isochore, slightly above its critical temperature. A spatiotemporal description of the flow is carried out from the convection onset until the settlement of a statistically steady state of heat transfer. This description concerns the structure of the temperature field, the distribution of the Nusselt numbers on the horizontal walls, and the global thermal equilibrium of the cavity.

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