Phys. Rev. Lett. 98, 198305 (2007) [4 pages]Shear Zones and Wall Slip in the Capillary Flow of Concentrated Colloidal SuspensionsSee Also: Erratum Received 28 February 2007; published 10 May 2007 We image the flow of a nearly random close packed, hard-sphere colloidal suspension (a “paste”) in a square capillary using confocal microscopy. The flow consists of a “plug” in the center while shear occurs localized adjacent to the channel walls, reminiscent of yield-stress fluid behavior. However, the observed scaling of the velocity profiles with the flow rate strongly contrasts yield-stress fluid predictions. Instead, the velocity profiles can be captured by a theory of stress fluctuations originally developed for chute flow of dry granular media. We verified this both for smooth and rough walls. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.198305
DOI:
10.1103/PhysRevLett.98.198305
PACS:
83.80.Hj, 83.50.Ha, 83.60.La
See AlsoErratum: Lucio Isa, Rut Besseling, and Wilson C. Poon, Erratum: Shear Zones and Wall Slip in the Capillary Flow of Concentrated Colloidal Suspensions [Phys. Rev. Lett. 98, 198305 (2007)], Phys. Rev. Lett. 99, 119901 (2007). |
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