Abstract
Granular flows of binary mixtures have been investigated in an inclined channel. The velocity profiles of the granular flows are obtained by employing a high-speed camera. The streamwise velocity profile of granular flows in the upper portion is linear for unmixed particles, and becomes more concave as the content of small particles increases, with the maximum shear rate obtained approximately at a constant depth. The surface velocity is determined by the large particles, while the flowing-layer thickness shows a dependence on the volume fraction. Moreover, we propose a velocity-dependent percolation resistance model for small particles and deduce a linear percolation velocity profile which agrees well with the experimental results. The percolation velocity decreases linearly with the depth and shows a dependence on the voidage.
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