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Search for the ``Ultimate State'' in Turbulent Rayleigh-Benard Convection Denis Funfschilling,1

Summary: Search for the ``Ultimate State'' in Turbulent Rayleigh-Be´nard Convection
Denis Funfschilling,1
Eberhard Bodenschatz,2
and Guenter Ahlers3
LSGC CNRS - GROUPE ENSIC, BP 451, 54001 Nancy Cedex, France
Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, D-37077 Goettingen, Germany
Department of Physics, University of California, Santa Barbara, California 93106, USA
(Received 16 April 2009; published 1 July 2009)
Measurements of the Nusselt number Nu and of temperature variations ÁTb in the bulk fluid are
reported for turbulent Rayleigh-Be´nard convection of a cylindrical sample. They cover the Rayleigh-
number range 109
& Ra & 3 Â 1014
using He (Prandtl number Pr ¼ 0:67), N2 ( Pr ¼ 0:72) and SF6
( Pr ¼ 0:79 to 0.84) at pressures up to 15 bars and near-ambient temperatures. The sample had a height
L ¼ 2:24 m and diameter D ¼ 1:12 m and was located in a new High-Pressure Convection Facility
(HPCF) at the Max Planck Institute for Dynamics and Self-Organization in Go¨ttingen, Germany. The data
do not show the transition to an ``ultimate regime'' reported by Chavanne et al. and are consistent with the


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara


Collections: Physics