Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2001, Volume8

Issue 1

100 pages

Issue price - $140.00

V. Latard
Laboratoire de Mecanique de Lille,URA CNRS 1441, 59655 Villeneuve d’Ascq, France

Y. Brunet
Laboratoire de Mecanique de Lille,URA CNRS 1441, 59655 Villeneuve d’Ascq, France

A. Merlen
Laboratoire de Mecanique de Lille,URA CNRS 1441, 59655 Villeneuve d’Ascq, France

Optical methods or visualizations cannot be performed for granular flows because of the opacity of these materials. Hence, the efficient techniques developed for flow analysis cannot be adapted. This reduces possible methods to the use of expensive magnetic or radioactive tracking methods or X-rays visualizations. In this article, optical particle tracking velocimetry (PTV) is presented for a mixture of oil and glass beads by matching the index refraction of both materials.The mixture of glass and oil is nontoxic and is inexpensive enough to allow applications on large-scale devices. This article shows that Lagrangian observations of single-colored particles, as well as Eulerian statistical fluxes, are possible. Here the technique is described for a sedimentation flow of 3-mm beads in a squared-section vertical tunnel. It can also be applied, even more easily, for granular flows in liquid, because the bead agitation is generally less intense in this case.

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