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Thermoacoustic and buoyancy-driven transport in a square side-heated cavity filled with a near-critical fluid

Published online by Cambridge University Press:  26 April 2006

Bernard Zappoli ,
Sakir Amiroudine ,
Pierre Carles  and
Jalil Ouazzani
Bernard Zappoli
Affiliation:
CNES, 18 Av. Edouard Belin, 31055 Toulouse Cedex, France
Sakir Amiroudine
Affiliation:
Institut de Mécanique des Fluides, 1 rue Honnorat 13003 Marseille, France
Pierre Carles
Affiliation:
Institut National Polytechnique de Toulouse, Place des Hauts Murats, 31006 Toulouse, France
Jalil Ouazzani
Affiliation:
Arco Fluid, IMT, Technopôle de Château Gombert, 13451 Marseille, France
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Abstract

The mechanisms of heat and mass transport in a side-heated square cavity filled with a near-critical fluid are explored, with special emphasis on the interplay between buoyancy-driven convection and the Piston Effect. The Navier–Stokes equations for a near-critical van der Waals gas are solved numerically by means of an acoustically filtered, finite-volume method. The results have revealed some striking behaviour compared with that obtained for normally compressible gases: (i) heat equilibration is still achieved rapidly, as under zero-g conditions, by the Piston Effect before convection has time to enhance heat transport; (ii) mass equilibration is achieved on a much longer time scale by quasi-isothermal buoyant convection; (iii) due to the very high compressibility, a stagnation-point effect similar to that encountered in high-speed flows provokes an overheating of the upper wall; and (iv) a significant difference to the convective single-roll pattern generated under the same conditions in normal CO2 is found, in the form of a double-roll convective structure.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 316 , 10 June 1996 , pp. 53 - 72
Copyright
© 1996 Cambridge University Press

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