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Large-Scale Flow Visualization and Particle Image Velocimetry in Convective Airflow

Resagk, Christian and du Puits, Ronald and Thess, André and Raffel, Markus and Bosbach, Johannes and Aroussi, Abdelwahab (2004) Large-Scale Flow Visualization and Particle Image Velocimetry in Convective Airflow. In: 11th International Symposium on Flow Visualization. 11th International Symposium on Flow Visualization, 2004-08-09 - 2004-08-12, University of Notre Dame, Notre Dame, Indiana, USA.

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Official URL: http://www.ode-web.demon.co.uk/11isfv/


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 an aspect ratio (A) of 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 A=2 in a light sheet plain of 4m x 3.5m show in agreement with these predictions various 2d and 3d large-scale velocity field structures. For seeding the convection flow Helium filled soap bubbles from a multi-channel bubble generator are used. These measurements in the large convections cell, based on large-scale PIV investigations of forced convection flows in large laboratories demonstrate the successful application of highly developed PIV techniques in strongly turbulent 3d flows in measurement areas larger than 3.5m x 3.5m.

Item URL in elib:https://elib.dlr.de/21610/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Large-Scale Flow Visualization and Particle Image Velocimetry in Convective Airflow
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Resagk, ChristianIlmenau University of TechnologyUNSPECIFIED
du Puits, RonaldIlmenau University of TechnologyUNSPECIFIED
Thess, AndréIlmenau University of TechnologyUNSPECIFIED
Aroussi, AbdelwahabUniversity of NottinghamUNSPECIFIED
Date:9 August 2004
Journal or Publication Title:11th International Symposium on Flow Visualization
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
Keywords:rayleigh-benard, convection, PIV, flow visualization, helium filled soap bubbles
Event Title:11th International Symposium on Flow Visualization
Event Location:University of Notre Dame, Notre Dame, Indiana, USA
Event Type:international Conference
Event Dates:2004-08-09 - 2004-08-12
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Bosbach, Dr.rer.nat. Johannes
Deposited On:24 Jan 2006
Last Modified:27 Apr 2009 04:55

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