01362nas a2200157   4500008004100000245011500041210006900156260000800225300001100233490000700244520076300251100002201014700002101036700002201057856012501079       2006                        eng d00aFriction of a slider on a granular layer: non-monotonic thickness dependence and effect of boundary conditions0 aFriction of a slider on a granular layer nonmonotonic thickness   cJAN  a0103010 v733 a<p>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 that 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 a 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.</p>1 aSiavoshi, Saloome1 aOrpe, Ashish, V.1 aKudrollim, Arshad  uhttps://library.ncl.res.in/content/friction-slider-granular-layer-non-monotonic-thickness-dependence-and-effect-boundary