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Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection
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SYSNO ASEP 0368244 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Efficiency of Heat Transfer in Turbulent Rayleigh-Benard Convection Tvůrce(i) Urban, Pavel (UPT-D) RID, ORCID, SAI
Musilová, Věra (UPT-D) RID, SAI, ORCID
Skrbek, L. (CZ)Celkový počet autorů 3 Zdroj.dok. Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 107, č. 1 (2011), 014302:1-4Poč.str. 4 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova natural convection ; thermal convection Vědní obor RIV BK - Mechanika tekutin CEP KJB200650902 GA AV ČR - Akademie věd CEZ AV0Z20650511 - UPT-D (2005-2011) UT WOS 000292330900006 EID SCOPUS 79961066947 DOI 10.1103/PhysRevLett.107.014302 Anotace 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. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2012
Počet záznamů: 1