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Experimental investigation of viscoplastic free-surface flows in a steady uniform regime

Published online by Cambridge University Press:  04 August 2014

Guillaume Chambon ,
A. Ghemmour  and
M. Naaim
Guillaume Chambon*
Affiliation:
IRSTEA, UR ETGR, Snow Avalanche and Torrent Control Research Unit, Domaine Universitaire, BP 76, Grenoble, France Université Grenoble Alpes, Grenoble, France
A. Ghemmour
Affiliation:
IRSTEA, UR ETGR, Snow Avalanche and Torrent Control Research Unit, Domaine Universitaire, BP 76, Grenoble, France Université Grenoble Alpes, Grenoble, France
M. Naaim
Affiliation:
IRSTEA, UR ETGR, Snow Avalanche and Torrent Control Research Unit, Domaine Universitaire, BP 76, Grenoble, France Université Grenoble Alpes, Grenoble, France
*
†Email address for correspondence: guillaume.chambon@irstea.fr
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Abstract

We present experimental results focused on the hydraulic properties of free-surface flows of viscoplastic fluids. The objective is to investigate the possibility of predicting macroscopic flow properties on the base of conventional rheometrical characterization of the fluids. The experiments are performed in an inclined conveyor-belt channel allowing us to generate gravity-driven surges which remain stationary in the laboratory frame. Two different types of materials are studied: Kaolin slurries and Carbopol microgels. Global height–velocity relationships and local velocity profiles are measured in the uniform zone for different experimental conditions (slope angle, rheological parameters). These data are then compared to theoretical predictions based on the Herschel–Bulkley constitutive law and independent measurements of the rheological parameters. Great care has been devoted to the determination of experimental uncertainties, including those associated with the rheometrical characterization. For Kaolin, the experimental results show excellent agreement with theoretical predictions. With Carbopol, on the contrary, a systematic discrepancy between measured and theoretical flow heights is observed. The velocity profiles do nevertheless remain consistent with a Herschel–Bulkley rheology, and we show that all experimental data can be explained by increasing the rheological parameters (yield stress and consistency) by 10–20 % compared to the values measured in the rheometer. Potential interpretations for this discrepancy are discussed.

JFM classification

Waves/Free-surface Flows: Hydraulics Interfacial Flows (free surface): Interfacial Flows (free surface) Non-Newtonian Flows: Non-Newtonian Flows

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 754 , 10 September 2014 , pp. 332 - 364
Copyright
© 2014 Cambridge University Press 

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