Three-dimensional Voronoï imaging methods for the measurement of near-wall particulate flows

A set of stereoscopic imaging techniques is proposed for the measurement of rapidly flowing dispersions of opaque particles observed near a transparent wall. The methods exploit projective geometry and the Voronoï diagram. They rely on purely geometrical principles to reconstruct 3D particle positio...

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Bibliographic Details
Published in:Experiments in fluids 2003-02, Vol.34 (2), p.227-241
Main Authors: SPINEWINE, B, CAPART, H, LARCHER, M, ZECH, Y
Format: Article
Language:English
Subjects:
Algorithms
Dispersions
Exact sciences and technology
Fluid dynamics
Fluidizing
Fundamental areas of phenomenology (including applications)
Imaging techniques
Instrumentation for fluid dynamics
Multiphase and particle-laden flows
Nonhomogeneous flows
Occlusion
Physics
Projective geometry
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Summary:A set of stereoscopic imaging techniques is proposed for the measurement of rapidly flowing dispersions of opaque particles observed near a transparent wall. The methods exploit projective geometry and the Voronoï diagram. They rely on purely geometrical principles to reconstruct 3D particle positions, concentrations, and velocities. The methods are able to handle position and motion ambiguities, as well as particle-occlusion effects, difficulties that are common in the case of dense dispersions of many identical particles. Fluidization cell experiments allow validation of the concentration estimates. A mature debris-flow experimental run is then chosen to test the particle-tracking algorithm. The Voronoï stereo methods are found to perform well in both cases, and to present significant advantages over monocular imaging measurements.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-002-0550-4