Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Flow Behavior of Clay‐Silt to Sand‐Silt Water‐Rich Suspensions at Low to High Shear Rates: Implications for Slurries, Transitional Flows, and Submarine Debris‐Flows

Flow Behavior of Clay‐Silt to Sand‐Silt Water‐Rich Suspensions at Low to High Shear Rates:... Water‐rich clay to sand suspensions show a shear rate dependent flow behavior and knowledge of the appropriate rheological model is relevant for sedimentological, industrial and hydraulic studies. We present experimental rheological measurements of water‐rich (40 to 60 wt%) clay to silt (population A) and silt to sand (population B) suspensions mixed in different proportions. The data evidence a shear rate dependent shear thinning‐shear thickening transition. At lower shear rates, the suspensions organize in chains of particles, whereas at higher shear rates, these chains disrupt so increasing the viscosity. The viscosity, consistency and yield stress decrease as the A+B fraction decreases as the content of B particles increases. This behavior reflects the competing effects of the lubrication and frictional processes as a function of particle size and water content. Transitional flows form by the incorporation of small amounts of the finer fraction while ‘oceanic floods’ form at the estuary of rivers and the submarine debris‐flows increase their velocity by incorporating water. The critical Reynolds number of the studied suspensions is ∼2000±100 suggesting that the grainsize plays a major role in the laminar to turbulent transition. Our results have implications for the modeling of sediment flows and the hazard related to floods. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

Flow Behavior of Clay‐Silt to Sand‐Silt Water‐Rich Suspensions at Low to High Shear Rates: Implications for Slurries, Transitional Flows, and Submarine Debris‐Flows

Loading next page...
 
/lp/wiley/flow-behavior-of-clay-silt-to-sand-silt-water-rich-suspensions-at-low-lxvjQuJTo6

References (55)

Publisher
Wiley
Copyright
Copyright © 2018 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/1755-6724.13735
Publisher site
See Article on Publisher Site

Abstract

Water‐rich clay to sand suspensions show a shear rate dependent flow behavior and knowledge of the appropriate rheological model is relevant for sedimentological, industrial and hydraulic studies. We present experimental rheological measurements of water‐rich (40 to 60 wt%) clay to silt (population A) and silt to sand (population B) suspensions mixed in different proportions. The data evidence a shear rate dependent shear thinning‐shear thickening transition. At lower shear rates, the suspensions organize in chains of particles, whereas at higher shear rates, these chains disrupt so increasing the viscosity. The viscosity, consistency and yield stress decrease as the A+B fraction decreases as the content of B particles increases. This behavior reflects the competing effects of the lubrication and frictional processes as a function of particle size and water content. Transitional flows form by the incorporation of small amounts of the finer fraction while ‘oceanic floods’ form at the estuary of rivers and the submarine debris‐flows increase their velocity by incorporating water. The critical Reynolds number of the studied suspensions is ∼2000±100 suggesting that the grainsize plays a major role in the laminar to turbulent transition. Our results have implications for the modeling of sediment flows and the hazard related to floods.

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Jan 1, 2018

Keywords: ; ; ; ; ; ;

There are no references for this article.