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Investigation of the mobile granular layer in bedload transport by laminar shearing flows

Published online by Cambridge University Press:  13 November 2013

Pascale Aussillous*
Affiliation:
Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13013 Marseille, France
Julien Chauchat
Affiliation:
Grenoble-INP/UJF-Grenoble 1/CNRS, LEGI UMR 5519, Grenoble, F-38041, France
Mickael Pailha
Affiliation:
Université de Savoie, POLYTECH Annecy-Chambéry, LOCIE - UMR5271, 73376 Le Bourget du Lac, France
Marc Médale
Affiliation:
Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13013 Marseille, France
Élisabeth Guazzelli
Affiliation:
Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13013 Marseille, France
*
Email address for correspondence: pascale.aussillous@univ-amu.fr

Abstract

The mobile layer of a granular bed composed of spherical particles is experimentally investigated in a laminar rectangular channel flow. Both particle and fluid velocity profiles are obtained using particle image velocimetry for different index-matched combinations of particles and fluid and for a wide range of fluid flow rates above incipient motion. A full three-dimensional investigation of the flow field inside the mobile layer is also provided. These experimental observations are compared to the predictions of a two-phase continuum model having a frictional rheology to describe particle–particle interactions. Different rheological constitutive laws having increasing degrees of sophistication are tested and discussed.

Type
Papers
Copyright
©2013 Cambridge University Press 

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Aussillous et al. supplementary movie

Typical movie of the bed test section for run 15.

Download Aussillous et al. supplementary movie(Video)
Video 9.2 MB

Aussillous et al. supplementary movie

Particle + fingerprint (◦, red) and solely fingerprint (∗, blue ) velocity profiles and particle volume fraction (+, green) for run 2 after 35.5s (velocity scale = 0.025mm.s−1.pixel−1, length scale = 0.029 mm.pixel−1, particle-volume-fraction scale = 0.001 pixel−1)

Download Aussillous et al. supplementary movie(Video)
Video 4.3 MB

Aussillous et al. supplementary movie

Particle + fingerprint (◦, red) and solely fingerprint (∗, blue) velocity profiles for run 16 after 115.5 s (velocity scale = 0.025 mm.s−1.pixel−1, length scale = 0.046 mm.pixel−1)

Download Aussillous et al. supplementary movie(Video)
Video 7.2 MB
Supplementary material: File

Aussillous et al. supplementary material

Data

Download Aussillous et al. supplementary material(File)
File 1.3 MB