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We image the flow of a nearly random close packed, hard-sphere colloidalsuspension (a `paste') in a square capillary using confocal microscopy. Theflow consists of a `plug' in the center while shear occurs localized adjacentto the channel walls, reminiscent of yield-stress fluid behavior. However, theobserved scaling of the velocity profiles with the flow rate strongly contrastsyield-stress fluid predictions. Instead, the velocity profiles can be capturedby a theory of stress fluctuations originally developed for chute flow of drygranular media. We verified this behavior both for smooth and rough boundaryconditions.Comment: 4 pages, 5 figure

Shear Zones and Wall Slip in the Capillary Flow of Concentrated Colloidal Suspensions