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Tomographic Particle Image Velocimetry of Turbulent Rayleigh-Benard Convection in a Cubic Sample

Schiepel, Daniel and Bosbach, Johannes and Wagner, Claus (2014) Tomographic Particle Image Velocimetry of Turbulent Rayleigh-Benard Convection in a Cubic Sample. Journal of Flow Visualization and Image Processing, 20 (1-2), pp. 3-23. Begell House. DOI: 10.1615/JFlowVisImageProc.2014010441 ISSN 1065-3090

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Official URL: http://www.dl.begellhouse.com/journals/52b74bd3689ab10b,50dc1df704f3fd0e,32b5b6687a853ce3.html

Abstract

We present an experimental study of turbulent Rayleigh-Bénard convection (RBC) in a cubic cell filled with water using tomographic particle image velocimetry. We developed and installed an RBC apparatus with high optical accessibility and a high power LED array for illumination. At the Prandtl number Pr = 6.9 and the Rayleigh number Ra = 1.0 x 10^10, we studied three dimensional large-scale flow structures (LSC) of RBC. Within the plane of the LSC, nonvanishing out-of-plane components were obtained even in the mean velocity field, indicating the necessity of measuring all three velocity components in volumes. Using the maximum velocity of the LSC, we determined the Reynolds number Re = 6275 which agrees within 5% with the values reported in other studies. Further, based on measured mean velocity profiles, we determined the viscous boundary layer thickness δu = 5.2 mm. Plotting the angular distribution of the maximal velocity measured in the LSC shows a four-leaf clover structure in agreement with the results obtained in Direct Numerical Simulations (DNS). Finally, a procedure to separate the turbulent velocity fluctuations from the measurement noise is discussed and applied to our data. It is shown that the measurement errors increase at the walls, especially in the back of the cell.

Item URL in elib:https://elib.dlr.de/90738/
Document Type:Article
Additional Information:ISSN Online: 1940-4336
Title:Tomographic Particle Image Velocimetry of Turbulent Rayleigh-Benard Convection in a Cubic Sample
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiepel, Danieldaniel.schiepel (at) dlr.deUNSPECIFIED
Bosbach, Johannesjohannes.bosbach (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Journal of Flow Visualization and Image Processing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:20
DOI :10.1615/JFlowVisImageProc.2014010441
Page Range:pp. 3-23
Publisher:Begell House
ISSN:1065-3090
Status:Published
Keywords:PIV, Tomo-PIV, Rayleigh-Bénard convection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:23 Oct 2014 15:59
Last Modified:08 Mar 2018 18:36

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