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Abdelhakim Benslimane, Karim Bekkour, Pierre Francois
Effect of addition of Carboxymethylcellulose (CMC) on the rheology and flow properties of bentonite suspensions
Appl. Rheol. 23:1 (2013) 13475 (10 pages)
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In this work, bentonite suspension and mixtures containing 5 wt% of bentonite and 0.1 and 0.5 wt% of carboxymethyl cellulose
(CMC) were investigated in terms of their rheology and hydrodynamic behaviour in pipe flow. All fluids exhibited non-
Newtonian rheological behaviour that can be well described by the three parameters Herschel-Bulkley model. The axial
velocity distribution was determined using ultrasonic pulsed Doppler velocimetry technique. In the laminar regime the flow
parameters were predicted by integration of the constitutive rheological model used. In the turbulent flow, the Dodge and
Metzner model was applied to fit the experimental data. The measurements of the friction factor showed a small amount of
drag reduction for the pure bentonite suspension, whereas for the polymer.clay blend the drag reduction was more important.
► Cite this publication as follows:
Benslimane A, Bekkour K, Francois P: Effect of addition of Carboxymethylcellulose (CMC) on the rheology and flow properties of bentonite suspensions, Appl. Rheol. 23 (2013) 13475.
Frederic Blanc, Francois.Peters, Elisabeth Lemaire
Particle Image Velocimetry in concentrated suspensions : Application to local rheometry
Appl. Rheol. 21:2 (2011) 23735 (10 pages)
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This paper presents an experimental facility that allows simultaneous viscosimetric and Particle Image Velocimetry measurements
on concentrated suspensions in a wide-gap Couette rheometer. The experimental procedure is detailed: the optical
characteristics of the index-matched suspension are carefully studied, the bottom end effect on both the viscosimetric measurements
and the recorded velocity profiles are analysed. First the experimental procedure is tested on a Newtonian fluid
whose viscosity is known. The spatial and time resolutions of our device are shown to be 200 μm and 100 ms. The precision
of the local viscosity measurement is evaluated to better than 4 %. Then we show that the device can be used to characterize
the rheological behaviour of a 47 %-concentrated suspension of 30 μm spheres. According to the particles large size, the
Brownian motion can be neglected. However, colloidal interaction are still noticeable.
► Cite this publication as follows:
Blanc F, Peters F, Lemaire E: Particle Image Velocimetry in concentrated suspensions : Application to local rheometry, Appl. Rheol. 21 (2011) 23735.
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