Grain flows in the collisional regime are self-regulated in such a way that dispersive pressure at every level tends to balance static pressure, and so cannot promote the upward segregation of large particles in a steady flow. Le Roux adds new insights to this analysis by pointing out that dispersive and static pressures would not balance in unsteady flows. When shear strain rate increases in a grain flow, dispersive pressure, which is positively correlated to shear strain rate, increases too, and the gradient of dispersive pressure becomes higher than the gradient of static pressure. As a consequence, the grain flow...

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