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Gravity-driven shear flow of a sediment-water mixture: Comparison of theory and experiment

Wang, Yongqi and Hutter, Kolumban and Gray, J. M. N. T. and Tai, Yih-Chin
Wieczorek, Gerald F. and Naeser, Nancy D. (eds.) :

Gravity-driven shear flow of a sediment-water mixture: Comparison of theory and experiment.
In: Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment : Proceedings of the Second International Conference on Debris-Flow Hazards Mitigation, Taipei, Taiwan, 16-18 August 2000. Balkema, Rotterdam , pp. 381-386. ISBN 905809149X
[Book Section] , (2000)

Abstract

A constitutive theory, which is based on the second law of thermodynamics and describes the flow of water-saturated granular materials, is briefly summarized. Experiments determining the grain flow velocity of a water-granular mixture down an inclined chute were performed using a CCD (charge-coupled device) camera to identify the particle velocities. Comparison of numerical results of the theory on gravity-driven shear flow of this binary mixture with the experimential data demonstrates qualitative agreement. The theory and the experiment prove that for a granular-fluid flow down a rough inclined chute, a layer of high shear rate occurs in the vicinity of the bottom, whose thickness is of the order of 10 - 15 grain diameters. Above this layer a plug-like region develops in which the velocity is almost constant.

Item Type: Book Section
Erschienen: 2000
Editors: Wieczorek, Gerald F. and Naeser, Nancy D.
Creators: Wang, Yongqi and Hutter, Kolumban and Gray, J. M. N. T. and Tai, Yih-Chin
Title: Gravity-driven shear flow of a sediment-water mixture: Comparison of theory and experiment
Language: English
Abstract:

A constitutive theory, which is based on the second law of thermodynamics and describes the flow of water-saturated granular materials, is briefly summarized. Experiments determining the grain flow velocity of a water-granular mixture down an inclined chute were performed using a CCD (charge-coupled device) camera to identify the particle velocities. Comparison of numerical results of the theory on gravity-driven shear flow of this binary mixture with the experimential data demonstrates qualitative agreement. The theory and the experiment prove that for a granular-fluid flow down a rough inclined chute, a layer of high shear rate occurs in the vicinity of the bottom, whose thickness is of the order of 10 - 15 grain diameters. Above this layer a plug-like region develops in which the velocity is almost constant.

Title of Book: Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment : Proceedings of the Second International Conference on Debris-Flow Hazards Mitigation, Taipei, Taiwan, 16-18 August 2000
Place of Publication: Rotterdam
Publisher: Balkema
Divisions: Study Areas
16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Study Areas > Study Area Mechanic
Date Deposited: 24 Aug 2011 18:22
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