Comments on heat trasfer efficiency in cryogenic helium turbulent Rayleigh-Bénard convection

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F11%3A00391089" target="_blank" >RIV/68081731:_____/11:00391089 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1742-6596/318/8/082012" target="_blank" >http://dx.doi.org/10.1088/1742-6596/318/8/082012</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1742-6596/318/8/082012" target="_blank" >10.1088/1742-6596/318/8/082012</a>

Result language
angličtina
Original language name
Comments on heat trasfer efficiency in cryogenic helium turbulent Rayleigh-Bénard convection
Original language description
An experimental study of turbulent Rayleigh-Benard convection (RBC) and of the influence of various experimental aspects is presented and comparison with similar experiments discussed. We use a cylindrical cell 0.3 m both in diameter and height, designedto minimize the influence of its structure on the convective flow of cryogenic He-4 gas of Prandtl number Pr approximate to 1. We measure the dependence of Nusselt (Nu) versus Rayleigh number (Ra) at high Ra and discuss various corrections that might beapplicable to the raw data. 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). We show that differences in Nu(Ra) scaling observed in similar RBC experiments for Ra greater than or similar to 10(11) c
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BK - Liquid mechanics
OECD FORD branch
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Project
<a href="/en/project/KJB200650902" target="_blank" >KJB200650902: Elucidation of fundamental questions in turbulent convection</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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