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Turbulent Rayleigh–Bénard convection in gaseous and liquid He

Phys. Fluids 13, 1300 (2001); doi:10.1063/1.1355683

Issue Date: May 2001

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X. Chavanne, F. Chillà, B. Chabaud, B. Castaing, and B. Hébral
Centre de Recherches sur les Très Basses Températures, associé àl'Université Joseph Fourier, CNRS, BP 166, 38042 Grenoble cedex 9, France
In this article we deal with the turbulent regimes of Rayleigh–Bénard convection, namely the 2/7 regime and beyond. An experiment with He at low temperature allows us to explore a large Rayleigh number (Ra) range up to 2×1014, under Boussinesq conditions, while the Prandtl number (Pr) is equal to and larger than 0.7. Calorimetric measurements evidence a departure from the 2/7 regime above Ra = 1011 toward a new regime where the heat transfer is enhanced. Local measurements with two nearby thermometers allows us to relate this change to a laminar–turbulent transition of the velocity boundary layer induced by the large-scale flow near the walls of the cell. The features of the observed new regime match those of the ultimate regime predicted by R. Kraichnan [Phys. Fluids 5, 1374 (1962)] at moderate Pr; in particular, our experimental data show that the thermal boundary layer lies inside the viscous sublayer of the turbulent boundary layer. ©2001 American Institute of Physics.
History: Received 7 April 2000; accepted 23 January 2001
Permalink: http://link.aip.org/link/?PHFLE6/13/1300/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.27.Te
    Fluid dynamics Turbulent flows, convection, and heat transfer Convection and heat transfer
  • 47.27.Nz
    Fluid dynamics Turbulent flows, convection, and heat transfer Boundary layer and shear turbulence
  • 47.27.Cn
    Fluid dynamics Turbulent flows, convection, and heat transfer Transition to turbulence
  • 47.15.Fe
    Fluid dynamics Laminar flows Stability of laminar flows
  • 47.60.+i
    Fluid dynamics Flows in ducts, channels, nozzles, and conduits (see also 83.50.Ha—in rheology)
  • 07.20.Dt
    Instruments, apparatus, and components common to several branches of physics and astronomy Thermal instruments and apparatus Thermometers
  • 07.20.Fw
    Instruments, apparatus, and components common to several branches of physics and astronomy Thermal instruments and apparatus Calorimeters
  • YEAR: 2001

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PUBLICATION DATA

ISSN:
1070-6631 (print)   1089-7666 (online)
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REFERENCES (37)
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