000014905 001__ 14905 000014905 005__ 20161115100205.0 000014905 04107 $$aeng 000014905 046__ $$k2016-08-21 000014905 100__ $$aClavaud, Cécile 000014905 24500 $$aAnomalous Low Friction Coefficient In Dense Suspensions 000014905 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers 000014905 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016 000014905 506__ $$arestricted 000014905 520__ $$2eng$$aWe study the friction coefficient of glass powders in water at low confining pressure, by measuring the pile slope angle in rotating drum flow experiments. We show that, at low rotation rates, the pile angle is about 10◦ , which is much lower than pile angles observed with larger glass beads in the same conditions (∼ 25◦ ). Changing the pH or salinity of the suspension restores the classical high slope angle, suggesting that physical and chemical interactions between particles are responsible for this observation. This result supports a recent scenario for the shear-thickening transition in such non-Brownian systems, where interparticle repulsive forces suppress friction at low confining pressure. 000014905 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000014905 653__ $$a 000014905 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016 000014905 720__ $$aClavaud, Cécile 000014905 8560_ $$ffischerc@itam.cas.cz 000014905 8564_ $$s104255$$uhttps://invenio.itam.cas.cz/record/14905/files/TS.FS08-2.03.pdf$$yOriginal version of the author's contribution as presented on CD, page 3357, code TS.FS08-2.03 . 000014905 962__ $$r13812 000014905 980__ $$aPAPER