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Summary: October 2007
EPL, 80 (2007) 14001 www.epljournal.org
doi: 10.1209/0295-5075/80/14001
Temperature gradients, and search for non-Boussinesq effects,
in the interior of turbulent Rayleigh-B´enard convection
E. Brown and G. Ahlers
Department of Physics and iQCD, University of California - Santa Barbara, CA 93106, USA
received 6 July 2007; accepted in final form 3 August 2007
published online 28 August 2007
PACS 47.27.-i Turbulent flows
PACS 47.55.P- Buoyancy-driven flows; convection
Abstract We report temperature measurements for a cylindrical sample of turbulent Rayleigh-
B´enard convection (RBC) at points in the interior, well away from the thermal boundary layers
near the top and bottom of the sample. The aspect ratio was equal to 1.00 and the Prandtl
number was equal to 4.4 or 5.5. The data are in the range 5 × 107
< R < 1010
, where R is
the Rayleigh number. Measurements of the temperatures T(r, z, ) at the side wall (r = L/2)
at eight equally spaced azimuthal positions and on three horizontal planes located at vertical
positions z = -L/4, 0, L/4 (the sample height and diameter are equal to L and z = 0 is located at
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