Anomalous Low Friction Coefficient In Dense Suspensions

Abstract eng:
We 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.

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