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Boundary layers in turbulent Rayleigh-Bénard convection

du Puits, Ronald and 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, 06.-11. Mar. 2016, Regensburg.

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Official URL: http://www.dpg-verhandlungen.de/year/2016/conference/regensburg/part/dy/session/57/contribution/3

Abstract

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.

Item URL in elib:https://elib.dlr.de/109915/
Document Type:Conference or Workshop Item (Speech)
Title:Boundary layers in turbulent Rayleigh-Bénard convection
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
du Puits, Ronaldtechnische universität ilmenauUNSPECIFIED
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Date:10 March 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:turbulent boundary layer, transition to turbulence, convection flow, particle image velocimetry, PIV
Event Title:Verhandlungen der Deutschen Physikalischen Gesellschaft, DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder
Event Location:Regensburg
Event Type:international Conference
Event Dates:06.-11. Mar. 2016
Organizer:Deutsche Physikalische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:04 Jan 2017 11:46
Last Modified:31 Jul 2019 20:07

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