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We report a transition from a disordered state to an ordered state in theflow of nearly mono-disperse granular matter flowing in an inclined channelwith a bumpy base, in discrete element method simulations. For lowparticle-sidewall friction coefficients, the particles are disordered and theBagnold velocity profile is obtained. However, for high sidewall friction, anordered state is obtained, characterized by a layering of the particles andhexagonal packing of the particles in each layer. The extent of ordering,quantified by the local bond-orientational order parameter, varies in thecross- section of the channel, with the highest ordering near the side walls.The flow transition significantly affects the local rheology: the effectivefriction coefficient is lower, and the packing fraction is higher, in theordered state compared to the disordered state. A simple model, incorporatingthe extent of local ordering, is shown to describe the rheology of the system.

A sidewall friction driven ordering transition in granular channel flows: Implications for granular rheology