Effect of boundary conditions in turbulent thermal convection
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F21%3A00544677" target="_blank" >RIV/68081731:_____/21:00544677 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/21:10442709
Result on the web
<a href="https://iopscience.iop.org/article/10.1209/0295-5075/ac0c89" target="_blank" >https://iopscience.iop.org/article/10.1209/0295-5075/ac0c89</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1209/0295-5075/ac0c89" target="_blank" >10.1209/0295-5075/ac0c89</a>
Alternative languages
Result language
angličtina
Original language name
Effect of boundary conditions in turbulent thermal convection
Original language description
We report an experimental study aiming to clarify the role of boundary conditions (BC) in high Rayleigh number 108 < Ra < 3 × 1012 turbulent thermal convection of cryogenic helium gas. We switch between BC closer to constant heat flux (CF) and constant temperature (CT) applied to the highly conducting bottom plate of the aspect-ratio-one cylindrical cell 30 cm in size, leading to dramatic changes in the temperature probability density function and in power spectral density of the temperature fluctuations measured at the bottom plate, while the dynamic thermal behaviour of the top plate and bulk convective flow remain unaffected. Within our experimental accuracy, we find no appreciable changes in Reynolds number Re(Ra) scaling, in the dimensionless heat transfer efficiency expressed via Nusselt number Nu(Ra) scaling, nor in the rate of direction reversals of large scale circulation.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
EPL
ISSN
0295-5075
e-ISSN
1286-4854
Volume of the periodical
134
Issue of the periodical within the volume
3
Country of publishing house
FR - FRANCE
Number of pages
7
Pages from-to
34003
UT code for WoS article
000731474100009
EID of the result in the Scopus database
2-s2.0-85111275466