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Large-Scale Particle Image Velocimetry in Convective Airflow

Resagk, Christian and du Puits, Ronald and Maystrenko, Anna and Thess, André and Bosbach, Johannes and Wagner, Claus (2005) Large-Scale Particle Image Velocimetry in Convective Airflow. In: 6th International Symposium on Particle Image Velocimetry PIV'05. 6th International Symposium on Particle Image Velocimetry PIV'05, 2005-09-21 - 2005-09-23, Pasadena, California, USA.

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Abstract

We report about the characterization of the flow structure in a large-scale Rayleigh-Bénard (RB) experiment in which a fluid is heated from below and cooled from above. The cylindrical convection cell filled with air has a diameter of 7.1m and a variable height between 0 and 6.30m. At aspect ratio 2 theoretical simulations of the mean velocity field (wind) and the velocity profile measurements predict a transition of a single 2d roll structure into a 3d multi-roll structure. Our stereo PIV measurements at aspect ratio 2 in a light sheet plane of 4m x 3.5m show in agreement with these predictions various 2d and 3d large-scale velocity field structures. Additional PIV measurements in a smaller rectangular convection box show similar coherent flow structures. For seeding the convection flow Helium filled soap bubbles from a multi-channel bubble generator are used. These measurements in the large convection cell, based on large-scale PIV investigations of forced convection flows in large laboratory rooms demonstrate the successful application of highly developed PIV techniques in strongly turbulent 3d flows in measurement areas larger than 3.5m x 3.5m.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Large-Scale Particle Image Velocimetry in Convective Airflow
Authors:
AuthorsInstitution or Email of Authors
Resagk, ChristianTechnische Universität Ilmenau
du Puits, RonaldTechnische Universität Ilmenau
Maystrenko, AnnaTechnische Universität Ilmenau
Thess, AndréTechnische Universität Ilmenau
Bosbach, JohannesUNSPECIFIED
Wagner, ClausUNSPECIFIED
Date:21 September 2005
Journal or Publication Title:6th International Symposium on Particle Image Velocimetry PIV'05
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Rayleigh-Bénard, turbulent convection, PIV
Event Title:6th International Symposium on Particle Image Velocimetry PIV'05
Event Location:Pasadena, California, USA
Event Type:international Conference
Event Dates:2005-09-21 - 2005-09-23
Organizer:California Institute of Technology
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Dr.rer.nat. Johannes Bosbach
Deposited On:14 Feb 2006
Last Modified:27 Apr 2009 04:56

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