期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.198305
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资金
- EPSRC [EP/D071070/1, EP/D067650/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D067650/1, GR/S10377/01, EP/D071070/1] Funding Source: researchfish
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.
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