Voronoï imaging methods for the measurement of granular flows | Zendy

Hervé Capart | Zendy; D.L. Young | Zendy; Yves Zech | Zendy

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Voronoï imaging methods for the measurement of granular flows

Author(s) -

Hervé Capart,

D.L. Young,

Yves Zech

Publication year - 2002

Publication title -

experiments in fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.01

H-Index - 122

eISSN - 1432-1114

pISSN - 0723-4864

DOI - 10.1007/s003480200013

Subject(s) - granular material , fluidization , flow (mathematics) , tracking (education) , debris flow , algorithm , mechanics , particle tracking velocimetry , estimator , computer science , particle (ecology) , debris , statistical physics , particle image velocimetry , fluidized bed , geology , mathematics , physics , geotechnical engineering , turbulence , statistics , meteorology , psychology , pedagogy , oceanography , thermodynamics

A set of digital imaging methods derived from the Voronoi diagram is proposed and tested on various liquid-granular flow applications. The methods include a novel pattern-based particle-tracking algorithm, as well as estimators of the three-dimensional granular concentration from two-dimensional images. The proposed algorithms are able to resolve individual grain motions even for rapid shear flows involving dense, fluctuating granular ensembles. Full automation is achieved, allowing the derivation of accurate statistics from large sets of individual measurements, as well as the construction of complete sets of grain trajectories. Results are presented for different applications: homogeneous fluidization, steady uniform debris flow, and unsteady debris surges

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