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Shear thinning in non-Brownian suspensions.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chatté, Guillaume Comtet, Jean Niguès, Antoine Bocquet, Lydéric Siria, Alessandro Ducouret, Guylaine Lequeux, François Lenoir, Nicolas Ovarlez, Guillaume Colin, Annie |
| Copyright Year | 2018 |
| Abstract | We study the flow of suspensions of non-Brownian particles dispersed into a Newtonian solvent. Combining capillary rheometry and conventional rheometry, we evidence a succession of two shear thinning regimes separated by a shear thickening one. Through X-ray radiography measurements, we show that during each of those regimes, the flow remains homogeneous and does not involve particle migration. Using a quartz-tuning fork based atomic force microscope, we measure the repulsive force profile and the microscopic friction coefficient μ between two particles immersed into the solvent, as a function of normal load. Coupling measurements from those three techniques, we propose that (1) the first shear-thinning regime at low shear rates occurs for a lubricated rheology and can be interpreted as a decrease of the effective volume fraction under increasing particle pressures, due to short-ranged repulsive forces and (2) the second shear thinning regime after the shear-thickening transition occurs for a frictional rheology and can be interpreted as stemming from a decrease of the microscopic friction coefficient at large normal load. |
| Starting Page | 879 |
| Ending Page | 893 |
| Page Count | 15 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c7sm01963g |
| PubMed reference number | 29215124 |
| Journal | Medline |
| Volume Number | 14 |
| Issue Number | 6 |
| Alternate Webpage(s) | http://www.phys.ens.fr/~lbocquet/publi/160article.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/c7sm01963g |
| Journal | Soft matter |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
