Phys. Rev. Lett. 79, 3648 - 3651 (1997)Observation of the Ultimate Regime in Rayleigh-Bénard Convection |
X. Chavanne1, F. Chillà2, B. Castaing1, B. Hébral1, B. Chabaud1, and J. Chaussy1
1Centre de Recherches sur les Très Basses Températures, Laboratoire Associé à l'Université Joseph Fourier, C.N.R.S., B.P. 166, 38 042 Grenoble-Cedex 9, France
2Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69 364 Lyon-Cedex 07, France
Received 8 July 1997
In a low temperature He gas Rayleigh-Bénard experiment, Rayleigh numbers from 103 to more than 1014 are explored. Local velocity is estimated through the time lag between two closeby temperature probes. This allows characterizing of the high Rayleigh regime (Ra>1011) as a fully turbulent one, possibly corresponding to the asymptotic regime predicted by R. Kraichnan [Phys. Fluids 5, 1374 (1962)].
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p3648
DOI: 10.1103/PhysRevLett.79.3648
PACS: 47.27.Jv, 67.90.+z
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