Effect of periodic bottom plate heating on large scale flow in turbulent Rayleigh-Bénard convection
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00455210" target="_blank" >RIV/68378271:_____/15:00455210 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Effect of periodic bottom plate heating on large scale flow in turbulent Rayleigh-Bénard convection
Original language description
We report analysis of temperature fluctuations measured inside a Rayleigh-Bénard convection cell of aspect ratio unity with steady and time-varying heating of the bottom boundary. The working fluid is cryogenic helium gas at Rayleigh number Ra = 1013, for which a large scale coherent flow (mean wind) exists. We observe the wind to occasionally vanish under both steady and time-varying heating conditions. However, with applied periodic modulation of the lower boundary temperature at the frequency of thewind, we can observe destruction of the periodic temperature variation at the cell mid-plane, due to relative changes in phase between the mean wind and the propagating temperature wave. The wind speed is not observed to change with modulation, demonstrating that it is set by mean properties of the system. Finally we propose that the frequency of the mean wind ? and hence the large scale Reynolds number ? could be better resolved by finding resonance with applied forcing.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Applied Fluid Mechanics
ISSN
1735-3572
e-ISSN
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Volume of the periodical
8
Issue of the periodical within the volume
3
Country of publishing house
IR - IRAN, ISLAMIC REPUBLIC OF
Number of pages
7
Pages from-to
483-489
UT code for WoS article
000362242800014
EID of the result in the Scopus database
2-s2.0-84929414967