du Puits, Ronald und Willert, Christian (2016) Boundary layers in turbulent Rayleigh-Bénard convection. Verhandlungen der Deutschen Physikalischen Gesellschaft, DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder, 2016-03-06 - 2016-03-11, Regensburg.
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Offizielle URL: http://www.dpg-verhandlungen.de/year/2016/conference/regensburg/part/dy/session/57/contribution/3
Kurzfassung
The heat transport throughout a fluid layer heated from below and cooled from above is mainly determined by two very thin flow regions adjacent to the hot bottom and the cold top wall. They are referred to as boundary layers. Following a hypothesis of Kraichnan [R. H. Kraichnan. Turbulent Thermal Convection at Arbitrary Prandtl Number. Phys. Fluids 5, 1374-1389 (1962)] it is widely believed nowadays that these boundary layers are of laminar type below a critical threshold in Rayleigh number and that they become turbulent above this limit. We show the results of highly resolved PIV measurements of the near-wall flow field in the large-scale convection facility Barrel of Ilmenau, an experiment which is seven meters in diameter and eight meters in height. Our measurements show that the dynamics of those boundary layers and the formation of coherent structures inside go far beyond a laminar shear layer of Prandtl-Blasius type although the Rayleigh number is considerably below the threshold predicted by Kraichnan.
elib-URL des Eintrags: | https://elib.dlr.de/109915/ | ||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||
Titel: | Boundary layers in turbulent Rayleigh-Bénard convection | ||||||||||||
Autoren: |
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Datum: | 10 März 2016 | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Ja | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Nein | ||||||||||||
In ISI Web of Science: | Nein | ||||||||||||
Status: | veröffentlicht | ||||||||||||
Stichwörter: | turbulent boundary layer, transition to turbulence, convection flow, particle image velocimetry, PIV | ||||||||||||
Veranstaltungstitel: | Verhandlungen der Deutschen Physikalischen Gesellschaft, DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder | ||||||||||||
Veranstaltungsort: | Regensburg | ||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||
Veranstaltungsbeginn: | 6 März 2016 | ||||||||||||
Veranstaltungsende: | 11 März 2016 | ||||||||||||
Veranstalter : | Deutsche Physikalische Gesellschaft | ||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||
HGF - Programmthema: | Antriebssysteme | ||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||
DLR - Forschungsgebiet: | L ER - Engine Research | ||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtuelles Triebwerk und Validierungsmethoden (alt) | ||||||||||||
Standort: | Köln-Porz | ||||||||||||
Institute & Einrichtungen: | Institut für Antriebstechnik > Triebwerksmesstechnik | ||||||||||||
Hinterlegt von: | Willert, Dr.phil. Christian | ||||||||||||
Hinterlegt am: | 04 Jan 2017 11:46 | ||||||||||||
Letzte Änderung: | 24 Apr 2024 20:15 |
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