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Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection
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SYSNO ASEP 0368244 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection Author(s) Urban, Pavel (UPT-D) RID, ORCID, SAI
Musilová, Věra (UPT-D) RID, SAI, ORCID
Skrbek, L. (CZ)Number of authors 3 Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 107, č. 1 (2011), 014302:1-4Number of pages 4 s. Language eng - English Country US - United States Keywords natural convection ; thermal convection Subject RIV BK - Fluid Dynamics R&D Projects KJB200650902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20650511 - UPT-D (2005-2011) UT WOS 000292330900006 EID SCOPUS 79961066947 DOI 10.1103/PhysRevLett.107.014302 Annotation 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. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2012
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