Flow resistance in the transition from dense to dilute granular-fluid flows

Substantial research work has been focusing on the flow resistance of dense granular-fluid geophysical flows, e.g., debris flows. However, the mechanism of flow resistance as the dense debris flows transition to the dilute debris flow range (volumetric solid concentration 60% to 40%) remains an unso...

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Bibliographic Details
Published in:Granular matter 2021-08, Vol.23 (3), Article 73
Main Authors: Song, D., Zhou, G. G. D., Chen, Q.
Format: Article
Language:English
Subjects:
Complex Fluids and Microfluidics
Computational fluid dynamics
Debris flow
Dilution
Engineering Fluid Dynamics
Engineering Thermodynamics
Flow resistance
Fluid flow
Fluid pressure
Foundations
Geoengineering
Heat and Mass Transfer
Hydraulics
Industrial Chemistry/Chemical Engineering
Materials Science
Model testing
Original Paper
Physics
Physics and Astronomy
Shear stress
Soft and Granular Matter
Thermal energy
Unsteady flow
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Summary:Substantial research work has been focusing on the flow resistance of dense granular-fluid geophysical flows, e.g., debris flows. However, the mechanism of flow resistance as the dense debris flows transition to the dilute debris flow range (volumetric solid concentration 60% to 40%) remains an unsolved problem. Based on the accurate measurements of normal/shear stresses and pore fluid pressure at the flume base, we analyze the flow resistance of a series of controlled debris flow model tests, covering the flow regime from friction dominated to viscous/collisional dominated. We find that the flow resistance, excluding the Coulomb frictional component, can be well described by a visco-collisional scaling relationship. The solid–fluid interaction in the dilute range would facilitate a quick rebalance against the gravity driven force in the transient flow condition. Finally, a heuristic model is proposed to unify the flow resistance for dense and dilute debris flows.
ISSN:1434-5021
1434-7636
DOI:10.1007/s10035-021-01134-1