| Issue |
Europhys. Lett.
Volume 58, Number 5, June 2002
|
|
|---|---|---|
| Page(s) | 693 - 698 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2002-00405-1 | |
| Published online | 01 May 2002 | |
Prandtl and Rayleigh numbers dependences in Rayleigh-Bénard convection
1
Centre de Recherches sur les Très Basses
Températures associé à l'Université Joseph Fourier -
38042 Grenoble Cedex 9, France
2
Laboratoire de Physique de la Matière Condensée, Ecole
Normale Supérieure
24 rue Lhomond, 75231 Paris Cedex 5, France
3
Ecole Normale Supérieure de Lyon -
46 allée d'Italie, 69364
Lyon Cedex 7, France
Received:
27
September
2001
Accepted:
14
March
2002
Using low-temperature gaseous helium close to the critical point, we
investigate the Prandtl-number dependence of the effective heat conductivity
(Nusselt number) for a 1/2 aspect ratio Rayleigh-Bénard cell. Very weak
dependence is observed in the range 0.7< Pr < 21; 
: the absolute value of the average logarithmic slope
is smaller than 0.03. A bimodality
of Nu, with 7% difference between the two sets of data, is observed, which
could explain some discrepancies between precise previous experiments in this
range.
PACS: 47.27.-i – Turbulent flows, convection, and heat transfer / 44.25.+f – Natural convection / 67.90.+z – Other topics in quantum fluids and solids; liquid and solid helium (restricted to new topics in section 67)
© EDP Sciences, 2002
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