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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/
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 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/ | |||||||||||||||||||||
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| Document Type: | Conference or Workshop Item (Speech, Paper) | |||||||||||||||||||||
| Title: | Large-Scale Flow Visualization and Particle Image Velocimetry in Convective Airflow | |||||||||||||||||||||
| Authors: |
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| 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 SCOPUS: | No | |||||||||||||||||||||
| In ISI Web of Science: | No | |||||||||||||||||||||
| Editors: |
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| Status: | Published | |||||||||||||||||||||
| 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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