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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

<a href="/cs/project/KJB200650902" target="_blank" >KJB200650902: Objasnění zásadních otázek turbulentní konvekce</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics: Conference Series

ISSN

1742-6588

e-ISSN

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Svazek periodika

318

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

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Kód UT WoS článku

000301224000012

EID výsledku v databázi Scopus

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