期刊
JOURNAL OF FLUID MECHANICS
卷 736, 期 -, 页码 594-615出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2013.546
关键词
granular media; particle/fluid flow; sediment transport
资金
- Agence Nationale de la Recherche [Dunes ANR-07-3 18-3892]
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.
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