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Abstract / Description of output
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.
Original language | English |
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Article number | 198305 |
Pages (from-to) | - |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 98 |
Issue number | 19 |
DOIs | |
Publication status | Published - 11 May 2007 |
Keywords / Materials (for Non-textual outputs)
- CHUTE FLOWS
- SIMULATIONS
- GLASSES
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Dive into the research topics of 'Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions'. Together they form a unique fingerprint.Projects
- 1 Finished
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Edinburgh Soft Matter and Statistical Physics Group: Programme Grant
Cates, M., Ackland, G., Egelhaaf, S., Evans, M., Poon, W. & Pusey, P.
1/10/03 → 31/03/08
Project: Research