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Boundary Layer Heat Transport in turbulent Rayleigh-Bénard Convection in Air

du Puits, Ronald and Resagk, Christian and Willert, Christian (2014) Boundary Layer Heat Transport in turbulent Rayleigh-Bénard Convection in Air. Proceedings in Applied Mathematics and Mechanics, 14 (1), pp. 657-658. Wiley. doi: 10.1002/pamm.201410312. ISSN 1617-7061.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pamm.201410312/abstract


We study the convective heat transfer in a large-scale Rayleigh-Bénard (RB) experiment which is called the “Barrel of Ilmenau”. We present the results of flow visualization and Particle Image Velocimetry (PIV) measurements of the near wall flow field in a plane perpendicular to the surface of the heated bottom plate. The experiment was run in a smaller rectangular inset that was placed inside the larger barrel. The Rayleigh number amounts to Ra=1.4 × 1010. The aspect ratios were Γx=1 in flow direction and Γy=0.26 perpendicular to the vertical flow plane. The measurements have been undertaken using a 2 W continuous wave Laser in combination with a light sheet optics and various cameras. Due to the slender geometry of the cell, the mean wind is confined in one direction where the Laser light sheet is aligned parallel. The flow was seeded with droplets of 1...2 µm size generated using an ordinary fog machine. Flow visualization as well as the PIV data clearly show the intermittent character of the boundary layer flow field that permanently switches between “laminar” and “turbulent” phases.

Item URL in elib:https://elib.dlr.de/94590/
Document Type:Article
Title:Boundary Layer Heat Transport in turbulent Rayleigh-Bénard Convection in Air
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
du Puits, RonaldTechnische Universität IlmenauUNSPECIFIED
Resagk, ChristianTechnische Universität IlmenauUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:December 2014
Journal or Publication Title:Proceedings in Applied Mathematics and Mechanics
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1002/pamm.201410312
Page Range:pp. 657-658
Series Name:Special Issue: 85th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Erlangen 2014; Editors: P. Steinmann and G. Leugering
Keywords:Rayleigh Benard convection, flow visualization, particle image velocimetry, transition to turbulence, boundary layer
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:15 Jan 2015 15:45
Last Modified:31 Jul 2019 19:51

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