ABSTRACT
We study the effect of the presence of moderate amounts of fluid on the angle of repose and the segregation properties of bidisperse spherical glass particles. The mixture is poured into a quasi-two dimensional silo, and the resulting pile is imaged through the transparent glass wall. The angle of repose and the distribution of the two kinds of particles are measured as a function of the fraction of the fluid. We find that the angle of repose increases and the segregation decreases sharply when a small amount of fluid is added and then saturates. The fluid is observed to cause the smaller particles to clump more than the larger particles. Layering of small and large beads is observed when the size of the clumps of small particles exceeds the size of the larger beads. The extent of segregation and the angle of repose are observed to depend on the viscosity of the fluid.
