Experiments in Fluids

, Volume 32, Issue 1, pp 121-135

First online:

Voronoï imaging methods for the measurement of granular flows

  • H. CapartAffiliated withFonds National de la Recherche Scientifique and Department of Civil Engineering, Université catholique de Louvain, 1 place du Levant, 1348 Louvain-la-Neuve, Belgium
  • , D. L. YoungAffiliated withDepartment of Civil Engineering and Hydrotech Research Institute, National Taiwan University, 158 Chow Shan Rd, Taipei 10617, Taiwan
  • , Y. ZechAffiliated withDepartment of Civil Engineering, Université catholique de Louvain, 1 place du Levant, 1348 Louvain-la-Neuve, Belgium

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

A set of digital imaging methods derived from the Voronoï 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.