Measurement of Particle Dynamics in Rapid Granular Shear Flows
Publication: Journal of Engineering Mechanics
Volume 135, Issue 4
Abstract
Micromechanics of rapid granular flows is studied in a two-dimensional planar granular Couette flow apparatus. The device is capable of generating particulate flows at different shearing rates and solid fractions. Monosize plastic disks are sheared across an annular test section for several shear rates. The motion of particles is recorded through a high speed digital camera and analyzed by image processing techniques. The average and fluctuation velocity profiles are obtained and granular temperature relations with shear rate are investigated. Average streaming velocity across the shear cell decays slightly faster than exponential, and is rather Gaussian when not too close to the wall. Fluctuation velocities and granular temperature across the shear cell are related to effective shear rate. Interparticle collisions are estimated from the particle trajectories and probability distribution of collision angles obtained from particle collision data. In dense flows, three peaks of collision angles are observed, which signal the onset of triangular structure formulation and cause crystallization. It is found that the distribution of collision angles is anisotropic.
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Acknowledgments
This study was performed at the Dept. of Civil and Environmental Engineering, Saitama University, Saitama, Japan. The writers appreciate great help from their colleagues in the experimental work. This research was partially supported by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research, Grant No. UNSPECIFIED18560482. Financial support to the first writer provided by the Asian Development Bank (ADB) is also greatly acknowledged. The writers are also grateful to Prof. M. Oda and Prof. K. Tanimoto for their invaluable comments and suggestions on the work.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 135 • Issue 4 • April 2009
Pages: 285 - 294
Copyright
© 2009 ASCE.
History
Received: Aug 15, 2007
Accepted: Sep 26, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
Notes
Note. Associate Editor: Anil Misra
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