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Long relaxation times and tilt sensitivity in Rayleigh Bénard turbulence

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Abstract.

We study the influence of a small tilt angle (\(0 < \theta < 3 \times 10^{-2}\)rd) on the Nusselt number in a 1/2 aspect ratio Rayleigh-Bénard cell, at high Rayleigh number (5 x 1011 < Ra < 4 x 1012). The small decrease observed is interpreted as revealing a two rolls structure of the flow. Transitions between different global flows are also observed, on very long times, comparable to the diffusion time on the whole cell. The consequence is that the Nusselt number observed in most high Ra experiments should significantly depend on initial conditions.

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Authors and Affiliations

  1. Laboratoire de Physique de l’École Normale Supérieure de Lyon, UMR5672, 46 allée d’Italie, 69364, Lyon Cedex 7, France

    F. Chillá, M. Rastello, S. Chaumat & B. Castaing

Authors
  1. F. Chillá
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  2. M. Rastello
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  3. S. Chaumat
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  4. B. Castaing
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Corresponding author

Correspondence to F. Chillá.

Additional information

Received: 19 May 2004, Published online: 12 August 2004

PACS:

92.60.Ek Convection, turbulence, and diffusion - 47.27.Te Convection and heat transfer - 44.25. + f Natural convection

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Chillá, F., Rastello, M., Chaumat, S. et al. Long relaxation times and tilt sensitivity in Rayleigh Bénard turbulence. Eur. Phys. J. B 40, 223–227 (2004). https://doi.org/10.1140/epjb/e2004-00261-3

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  • DOI: https://doi.org/10.1140/epjb/e2004-00261-3

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