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Shallow granular flows O. Bokhove1

Summary: 1
Shallow granular flows
O. Bokhove1
and A.R. Thornton2
1. Department of Applied Mathematics
2. Department of Applied Mathematics and Department of Mechanical Engineering
University of Twente, Enschede, 7500AE, The Netherlands
Straightforward shallow granular flow consists of the movement of dry particulate material
traveling in relatively thin layers over (inclined) topography. Often the fluidized material
involved is more complex, consisting of a multiphase mixture of predominantly solid matter with
an interstitial fluid filling the pore space. Small-scale laboratory experiments of glass beads or
sand flowing down inclined chutes are an example of the dry case, which are performed to study
idealized granular systems. In nature, the situation is often complicated by the presence of a
fluid; examples include the collapse of water-saturated slopes into debris flows, or the flow of
pyroclastic material into a river forming a lahar.
The fascination of shallow granular flows lies in their multi-facetted behavior. Particles
are strongly forced down-slope by gravity, delivering energy to the system and allowing the
particles to flow. This energy is balanced by losses through inelastic particle-particle collisions
and frictional interaction with the substrate over which the particles are moving. After a short


Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente


Collections: Engineering