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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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