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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.

Full text not available from this repository.

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Large-Scale Flow Visualization and Particle Image Velocimetry in Convective Airflow
Authors:
AuthorsInstitution or Email of Authors
Resagk, ChristianIlmenau University of Technology
du Puits, RonaldIlmenau University of Technology
Thess, AndréIlmenau University of Technology
Raffel, MarkusUNSPECIFIED
Bosbach, JohannesUNSPECIFIED
Aroussi, AbdelwahabUniversity of Nottingham
Date:9 August 2004
Journal or Publication Title:11th International Symposium on Flow Visualization
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Grant, I.UNSPECIFIED
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 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:24 Jan 2006
Last Modified:27 Apr 2009 04:55

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