Fulltext

Buoyancy Sustained by Viscous Dissipation

Magyari, E. ; Keller, B.

In: Transport in Porous Media, 2003, vol. 53, no. 1, p. 105-115

Zum persönliche Liste hinzufügen
    Titel
    • Buoyancy Sustained by Viscous Dissipation
    Autor
    • Magyari, E.. Chair of Physics of Buildings, Institute of Building, Technology, Swiss Federal Institute of Technology (ETH), Zürich, Wolfgand-Pauli-Str. 1, HIL E, CH-8093, Zürich, Switzerland
    • Keller, B.. Chair of Physics of Buildings, Institute of Building, Technology, Swiss Federal Institute of Technology (ETH), Zürich, Wolfgand-Pauli-Str. 1, HIL E, CH-8093, Zürich, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Transport in Porous Media, 2003, vol. 53, no. 1, p. 105-115. Kluwer Academic Publishers
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:315627
    Summary
    The quasi-parallel regime of a Darcy-Boussinesq boundary-layer flow over a permeable vertical flat plate adjacent to a fluid saturated porous medium is considered. ‘Quasi-parallel' means here a plane flow with a constant transversal velocity v=−v 0 directed perpendicularly towards the vertical surface, where a lateral suction with the same velocity −v 0 is applied. The plate is held at a constant temperature T w which coincides with the ambient temperature T ∞ of the fluid. The heat released by viscous dissipation induces a density gradient in the fluid. Thus, although T w=T ∞, a thermal convection occurs. The steady regime of this ‘self-sustaining buoyant flow' has been examined in detail. Wall jet-like profiles with a continuous but finite spectrum of the momentum flow have been found. These self-sustaining buoyant jets show a universal behavior, that is, there exist certain length, velocity and temperature scales such that the flow characteristics become independent of the (constant) material properties of the fluid and the porous medium as well