Search for the "ultimate state" in turbulent Rayleigh-Bénard convection

2009/04/16 by Denis Funfschilling, Eberhard Bodenschatz, Funfschilling, Denis +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #physics.flu-dyn

paper · pdf · doi:10.48550/arxiv.0904.2526

4 pages, 4 figures

arxiv created 2009/04/16 · arxiv updated 2009/12/01

Abstract

Measurements of the Nusselt number Nu and of temperature variations ΔT_b in the bulk fluid are reported for turbulent Rayleigh-Bénard convection of a cylindrical sample. They cover the Rayleigh-number range 10⁹ \alt Ra \alt 3× 10¹⁴ using He (Prandtl number Pr = 0.67), N₂ (Pr = 0.72) and SF₆ (Pr = 0.79 to 0.84) at pressures up to 15 bars and near-ambient temperatures. The sample had a height L=2.24m and diameter D = 1.12m and was located in a new High-Pressure Convection Facility (HPCF) at the Max Planck Institute for Dynamics and Self-Organization in Göttingen, Germany. The data do not show the transition to an "ultimate regime" reported by Chavanne et al. and are consistent with the measurements of Niemela et al.

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