Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection

0368244 - ÚPT 2012 RIV US eng J - Journal Article
Urban, Pavel - Musilová, Věra - Skrbek, L.
Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection.
Physical Review Letters. Roč. 107, č. 1 (2011), 014302:1-4. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA AV ČR KJB200650902
Institutional research plan: CEZ:AV0Z20650511
Keywords : natural convection * thermal convection
Subject RIV: BK - Fluid Dynamics
Impact factor: 7.370, year: 2011

We present an experimental study of turbulent Rayleigh-Benard convection (RBC) in a cylindrical cell of height 0.3 m, diameter 0.3 m. It is designed to minimize the influence of its structure on the convective flow of cryogenic (4)He gas of Prandtl number Pr approximate to 1, with the aim of resolving existing contradictions in Nusselt (Nu) versus Rayleigh number (Ra) scaling. For 7.2 X 10(6) <= Ra less than or similar to 10(11) our data agree with suitably corrected data from similar cryogenic experiments and are consistent with Nu proportional to Ra(2/7). On approaching Ra approximate to 10(11) our data display a crossover to Nu proportional to Ra(1/3) that approximately holds up to Ra congruent to 4.6 X 10(13); there is no sign of a transition to the ultimate Kraichnan regime. Differences in Nu(Ra) scaling observed in similar RBC experiments for Ra greater than or similar to 10(11) cannot be explained due to the difference in Pr, but seem to depend also on experimental details.
Permanent Link: http://hdl.handle.net/11104/0202640