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Boundary layer structure in turbulent Rayleigh-Bénard convection in air

du Puits, Ronald and Willert, Christian (2015) Boundary layer structure in turbulent Rayleigh-Bénard convection in air. Ninth International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9), 30. Jun. - 03. Jul. 2015, Melbourne, Australia.

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Official URL: http://tsfp9.org/

Abstract

We present Particle Image Velocimetry measurements in the boundary layer in turbulent Rayleigh-Bénard (RB) convection for the Rayleigh number Ra=1.4×10E10 and the Prandtl number Pr=0.7. The measurements have been undertaken in a large-scale RB experiment 7.15 m in diameter and 6.30 m in height which is called the “Barrel of Ilmenau”. They give detailed insight into the near-wall flow field in turbulent RB convection and provide experimental data to evaluate various competing theories on the heat transport which essentially based on the boundary layer. We found that the convective boundary layer becomes turbulent locally and temporarily although its shear Reynolds number Re_s=(U_\infty \delta)⁄\nu ≈ 265 (U_\infty - outer velocity, \delta - boundary layer thickness, \nu - kinematic viscosity) is considerably smaller than the value 420 underlying existing phenomenological theories.

Item URL in elib:https://elib.dlr.de/98606/
Document Type:Conference or Workshop Item (Speech)
Title:Boundary layer structure in turbulent Rayleigh-Bénard convection in air
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
du Puits, RonaldTechnische Universität IlmenauUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:June 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:laminar-turbulent transition, intermittency, heat transfer, Rayleigh-Bénard convection, boundary layer, particle image velocimetry, PIV
Event Title:Ninth International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9)
Event Location:Melbourne, Australia
Event Type:international Conference
Event Dates:30. Jun. - 03. Jul. 2015
Organizer:University of Melbourne
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:09 Nov 2015 13:21
Last Modified:31 Jul 2019 19:55

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