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3D scanning particle tracking velocimetry

Hoyer, Klaus ; Holzner, Markus ; Lüthi, Beat ; Guala, Michele ; Liberzon, Alexander ; Kinzelbach, Wolfgang

In: Experiments in Fluids, 2005, vol. 39, no. 5, p. 923-934

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    Titre
    • 3D scanning particle tracking velocimetry
    Auteur
    • Hoyer, Klaus. Institut für Hydromechanik und Wasserwirtschaft, Swiss Federal Institut of Technology Zurich, 8093, ETH Hönggerberg, Zürich, Switzerland
    • Holzner, Markus. Institut für Hydromechanik und Wasserwirtschaft, Swiss Federal Institut of Technology Zurich, 8093, ETH Hönggerberg, Zürich, Switzerland
    • Lüthi, Beat. Risø National Laboratory, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark
    • Guala, Michele. Institut für Hydromechanik und Wasserwirtschaft, Swiss Federal Institut of Technology Zurich, 8093, ETH Hönggerberg, Zürich, Switzerland
    • Liberzon, Alexander. Institut für Hydromechanik und Wasserwirtschaft, Swiss Federal Institut of Technology Zurich, 8093, ETH Hönggerberg, Zürich, Switzerland
    • Kinzelbach, Wolfgang. Institut für Hydromechanik und Wasserwirtschaft, Swiss Federal Institut of Technology Zurich, 8093, ETH Hönggerberg, Zürich, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:313415
    Summary
    In this article, we present an experimental setup and data processing schemes for 3D scanning particle tracking velocimetry (SPTV), which expands on the classical 3D particle tracking velocimetry (PTV) through changes in the illumination, image acquisition and analysis. 3D PTV is a flexible flow measurement technique based on the processing of stereoscopic images of flow tracer particles. The technique allows obtaining Lagrangian flow information directly from measured 3D trajectories of individual particles. While for a classical PTV the entire region of interest is simultaneously illuminated and recorded, in SPTV the flow field is recorded by sequential tomographic high-speed imaging of the region of interest. The advantage of the presented method is a considerable increase in maximum feasible seeding density. Results are shown for an experiment in homogenous turbulence and compared with PTV. SPTV yielded an average 3,500 tracked particles per time step, which implies a significant enhancement of the spatial resolution for Lagrangian flow measurements