Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-12-22
Phys. Rev. E, 73, 010301 (2006)
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 6 figures
Scientific paper
10.1103/PhysRevE.73.010301
We investigate the effective friction encountered by a mass sliding on a granular layer as a function of bed thickness and boundary roughness conditions. The observed friction has minima for a small number of layers before it increases and saturates to a value which depends on the roughness of the sliding surface. We use an index-matched interstitial liquid to probe the internal motion of the grains with fluorescence imaging in a regime where the liquid has no significant effect on the measured friction. The shear profiles obtained as a function of depth show decrease in slip near the sliding surface as the layer thickness is increased. We propose that the friction depends on the degree of grain confinement relative to the sliding surfaces.
Kudrolli Arshad
Orpe Ashish V.
Siavoshi Saloome
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