Volume 107, Number 6, September 2014
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||22 September 2014|
Shear thickening in highly viscous granular suspensions
1 Department of Physics, University of Chicago - Chicago, IL 60637, USA
2 James Franck Institute, University of Chicago - Chicago, IL 60637, USA
3 Department of Mechanical Engineering and Materials Science, Yale University - New Haven, CT 06520, USA
Received: 18 June 2014
Accepted: 1 September 2014
We experimentally investigate shear thickening in dense granular suspensions under oscillatory shear. Directly imaging the suspension-air interface, we observe dilation beyond a critical strain and the end of shear thickening as the maximum confining stress is reached and the contact line moves. Analyzing the shear profile, we extract the viscosity contributions due to hydrodynamics , dilation and sedimentation . While governs the shear thinning regime, and together determine the shear thickening behavior. As the suspending liquid's viscosity varies from 10 to 1000 cSt, is found to compete with and soften the discontinuous nature of shear thickening.
PACS: 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening) / 47.57.E- – Suspensions / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EPLA, 2014
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