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Article Dans Une Revue EPL - Europhysics Letters Année : 2002

Prandtl and Rayleigh numbers dependences in Rayleigh Bénard convection

Résumé

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; 2 × 10^8 < Ra < 2 × 10^10: the absolute value of the average logarithmic slope δ = (∂ln Nu/∂ln Pr)Ra 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.
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Dates et versions

hal-00521142 , version 1 (02-06-2017)

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Philippe-Emmanuel Roche, Bernard Castaing, Benoît Chabaud, Bernard Hébral. Prandtl and Rayleigh numbers dependences in Rayleigh Bénard convection. EPL - Europhysics Letters, 2002, 58 (5), pp.693-698. ⟨10.1209/epl/i2002-00405-1⟩. ⟨hal-00521142⟩
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