Reynolds number scaling in cryogenic turbulent Rayleigh-Benard convection in a cylindrical aspect ratio one cell

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00482462" target="_blank" >RIV/68081731:_____/17:00482462 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/17:10368076

Result on the web

<a href="http://dx.doi.org/10.1017/jfm.2017.638" target="_blank" >http://dx.doi.org/10.1017/jfm.2017.638</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jfm.2017.638" target="_blank" >10.1017/jfm.2017.638</a>

Result language

angličtina

Original language name

Reynolds number scaling in cryogenic turbulent Rayleigh-Benard convection in a cylindrical aspect ratio one cell

Original language description

We perform an experimental study of turbulent Rayleigh-Benard convection up to very high Rayleigh number, 10(8) < Ra < 10(14), in a cylindrical aspect ratio one cell, 30 cm in height, filled with cryogenic helium gas. We monitor temperature fluctuations in the convective flow with four small (0.2 mm) sensors positioned in pairs 1.5 cm from the sidewalls and 2.5 cm vertically apart and symmetrically around the mid-height of the cell. Based on one-point and two-point correlations of the temperature fluctuations, we determine different types of Reynolds numbers, Re, associated with the large-scale circulation (LSC). We observe a transition between two types of Re. Ra/scaling around Ra = 10(10)-10(11), which is accompanied by a scaling change of the skewness of the probability distribution functions (PDFs) of the temperature fluctuations. The Re. Ra/dependencies measured near the sidewall at Prandtl number Pr similar to 1 are consistent with the (RaPr2/3)-Pr-4/9 scaling above the transition, while for Ra < 10(10), the Re. Ra/dependencies are steeper. It seems likely that this change in Re. Ra/scaling is linked to the previously reported change in the Nusselt number Nu. Ra/scaling. This behaviour is in agreement with independent cryogenic laboratory experiments with Pr similar to 1, but markedly different from the Re scaling obtained in water experiments (Pr similar to 3: 3-5: 6). We discuss the results in comparison with different versions of the Grossmann-Lohse theory.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

Journal of Fluid Mechanics

ISSN

0022-1120

e-ISSN

—

Volume of the periodical

832

Issue of the periodical within the volume

OCT 26

Country of publishing house

GB - UNITED KINGDOM

Number of pages

24

Pages from-to

721-744

UT code for WoS article

000413861400001

EID of the result in the Scopus database

2-s2.0-85033372569