Search of the 'ultimate state' in the turbulent Rayleight-Bénard convection for Rayleigh numbers up to 4x1013 and Prandtl number near 0.8
| Autor: | Ahlers, G., Funfschilling, D., Bodenschatz, E. |
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| Přispěvatelé: | Department of Physics and iQCD, University of California [Santa Barbara] (UCSB), University of California-University of California, Laboratoire des Sciences du Génie Chimique (LSGC), Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), Max Planck Institute for Dynamics and Self-Organization (MPIDS), Max-Planck-Gesellschaft |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Bulletin of the American Physical Society 2009 APS March Meeting 2009 APS March Meeting, Mar 2009, Pittsburgh, Pennsylvania, United States |
| Popis: | International audience; Measurements of the Nusselt number $Nu$ over the Rayleigh-number range $10^{10} < Ra < 4\times 10^{13}$ for N$_2$ (Prandtl number $Pr = 0.72$) and SF$_6$ ($Pr = 0.78$ to 0.82) are reported. They were made at pressures up to 15 bars and near-ambient temperatures for a cylindrical sample of height $L=2.2$ m and diameter $D = 1.1$ m in a new High-Pressure Convection Facility (HPCF) constructed at the Max Planck Institute for Dynamics and Self-Organization in Göttingen, Germany. The data can be represented well by a power law with an effective exponent of 0.31. They do not show the transition to an ``ultimate regime" reported by Chavanne et al. |
| Databáze: | OpenAIRE |
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