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Granular suspensions are generally made by dispersing granular particles in a Newtonian fluid. A complete understanding of its flow behavior is of great importance, since the handling and transport of granular materials consumes about 10% of the world energy. Shear thickening, the increase of shear viscosity with increasing shear rate, is a typical phenomenon observed in concentrated granular suspensions. However, as of yet the behavior is still not completely understood. Using rheological methods, we systematically investigate its shear thickening, normal stress behavior and its elongational rheology (droplet pinch-off).
Goals
- To explore non-monotonic shear thickening behavior under shear stress-controlled rheology.
- By normal stress measurement, we are trying to decouple the respective contribution of hydrodynamic interaction and frictional force to the shear thickening effect
- Studying the influence of shear thickening effect on the elongational rheology of suspensions.