The wind in confined thermal convection

J. J. Niemela, L. Skrbek, K. R. Sreenivasan, R. J. Donnelly

Research output: Contribution to journalArticle

Abstract

A large-scale circulation velocity, often called the 'wind', has been observed in turbulent convection in the Rayleigh-Bénard apparatus, which is a closed box with a heated bottom wall. The wind survives even when the dynamical parameter, namely the Rayleigh number, is very large. Over a wide range of time scales greater than its characteristic turnover time, the wind velocity exhibits occasional and irregular reversals without a change in magnitude. We study this feature experimentally in an apparatus of aspect ratio unity, in which the highest attainable Rayleigh number is about 1016. A possible physical explanation is attempted.

Original languageEnglish (US)
Pages (from-to)169-178
Number of pages10
JournalJournal of Fluid Mechanics
Volume449
StatePublished - Dec 25 2001

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Rayleigh number
free convection
wind velocity
boxes
aspect ratio
unity
convection
Aspect ratio
Hot Temperature
Convection

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

Niemela, J. J., Skrbek, L., Sreenivasan, K. R., & Donnelly, R. J. (2001). The wind in confined thermal convection. Journal of Fluid Mechanics, 449, 169-178.

The wind in confined thermal convection. / Niemela, J. J.; Skrbek, L.; Sreenivasan, K. R.; Donnelly, R. J.

In: Journal of Fluid Mechanics, Vol. 449, 25.12.2001, p. 169-178.

Research output: Contribution to journalArticle

Niemela, JJ, Skrbek, L, Sreenivasan, KR & Donnelly, RJ 2001, 'The wind in confined thermal convection', Journal of Fluid Mechanics, vol. 449, pp. 169-178.
Niemela JJ, Skrbek L, Sreenivasan KR, Donnelly RJ. The wind in confined thermal convection. Journal of Fluid Mechanics. 2001 Dec 25;449:169-178.
Niemela, J. J. ; Skrbek, L. ; Sreenivasan, K. R. ; Donnelly, R. J. / The wind in confined thermal convection. In: Journal of Fluid Mechanics. 2001 ; Vol. 449. pp. 169-178.
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