S-Shaped Flow Curves of Shear Thickening Suspensions: Direct Observation of Frictional Rheology
| Autor: | Pan, Zhongcheng, de Cagny, Henri, Weber, Bart, Bonn, Daniel |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Rev. E 92, 032202 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevE.92.032202 |
| Popis: | We study the rheological behavior of concentrated granular suspensions of simple spherical particles. Under controlled stress, the system exhibits an S-shaped flow curve (stress vs. shear rate) with a negative slope in between the low-viscosity Newtonian regime and the shear thickened regime. Under controlled shear rate, a discontinuous transition between the two states is observed. Stress visualization experiments with a novel fluorescent probe suggest that friction is at the origin of shear thickening. Stress visualization shows that the stress in the system remains homogeneous (no shear banding) if a stress is imposed that is intermediate between the high and low-stress branches. The S-shaped shear thickening is then due to the discontinuous formation of a frictional force network between particles upon increasing the stress. Comment: 5 pages + 6 figures |
| Databáze: | arXiv |
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