LrgpV1, Main, Merge, bibRecord, 000865

Transition to the Ultimate State of Turbulent Rayleigh-Benard Convection

Identifieur interne : 000865 ( Main/Merge ); précédent : 000864; suivant : 000866

Transition to the Ultimate State of Turbulent Rayleigh-Benard Convection

Auteurs : Xiaozhou He [Allemagne] ; Denis Funfschilling [France] ; Holger Nobach [Allemagne] ; Eberhard Bodenschatz [Allemagne] ; Guenter Ahlers [États-Unis]

Source :

Physical Review Letters [ 0031-9007 ] ; 2012-01-09.

RBID : Hal:hal-00778263

English descriptors

mix :
- BOUNDARY-LAYER, HELIUM, NUMBER, PRANDTL, REGIME, TEMPERATURE, THERMAL-CONVECTION.

Abstract

Measurements of the Nusselt number Nu and of a Reynolds number Re(eff) for Rayleigh-Benard convection (RBC) over the Rayleigh-number range 10(12) less than or similar to & Ra less than or similar to 10(15) and for Prandtl numbers Pr near 0.8 are presented. The aspect ratio Gamma equivalent to D/L of a cylindrical sample was 0.50. For Ra less than or similar to 10(13) the data yielded Nu alpha Ra(gamma eff) with gamma(eff) similar or equal to 0.31 and Re(eff) alpha Ra(zeta eff) with zeta(eff) similar or equal to 0.43, consistent with classical turbulent RBC. After a transition region for 10(13) less than or similar to Ra less than or similar to 5x 10(14), where multistability occurred, we found gamma(eff) similar or equal to 0: 38 and zeta(eff) = zeta similar or equal to 0.50, in agreement with the results of Grossmann and Lohse for the large-Ra asymptotic state with turbulent boundary layers which was first predicted by Kraichnan.

Url:

https://hal.archives-ouvertes.fr/hal-00778263

DOI: 10.1103/PhysRevLett.108.024502

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Measurements of the Nusselt number Nu and of a Reynolds number Re(eff) for Rayleigh-Benard convection (RBC) over the Rayleigh-number range 10(12) less than or similar to & Ra less than or similar to 10(15) and for Prandtl numbers Pr near 0.8 are presented. The aspect ratio Gamma equivalent to D/L of a cylindrical sample was 0.50. For Ra less than or similar to 10(13) the data yielded Nu alpha Ra(gamma eff) with gamma(eff) similar or equal to 0.31 and Re(eff) alpha Ra(zeta eff) with zeta(eff) similar or equal to 0.43, consistent with classical turbulent RBC. After a transition region for 10(13) less than or similar to Ra less than or similar to 5x 10(14), where multistability occurred, we found gamma(eff) similar or equal to 0: 38 and zeta(eff) = zeta similar or equal to 0.50, in agreement with the results of Grossmann and Lohse for the large-Ra asymptotic state with turbulent boundary layers which was first predicted by Kraichnan.</div>
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Transition to the Ultimate State of Turbulent Rayleigh-Benard Convection

Transition to the Ultimate State of Turbulent Rayleigh-Benard Convection

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri