Velocity fluctuations and hydrodynamic diffusion in finite-Reynolds-number sedimenting suspensions
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Plane model of fluid interface rupture in an electric field
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Shear-induced particle migration in binary colloidal suspensions
Phys. Fluids 20, 043306 (2008); doi:10.1063/1.2907378
Published 25 April 2008
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We present experimental investigations of the spatial and temporal evolution of particle migration in pressure driven flows of Brownian particle suspensions. Binary suspensions of 1.4 and 3.0 µm diameter colloidal particles are pumped through a 50×500 µm2 rectangular-cross-section capillary tube. Shear rate gradients caused by the resulting parabolic velocity profile drive the particles away from the walls toward the center of the channel, where the shear rate is lowest. The flows are directly imaged using high-speed laser scanning confocal microscopy. Size segregation of the particles is observed. Depending on the conditions, either the large or the small particles enrich the center. We measure the development of the size segregation by tracking the evolution of the cross-stream concentrations of the particles.
©2008 American Institute of Physics
| History: | Received 27 September 2007; accepted 4 March 2008; published 25 April 2008 |
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http://link.aip.org/link/?PHFLE6/20/043306/1 |
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BibSonomy
KEYWORDS and PACS
- 83.50.Ha
Flow in channels (rheology) - 83.80.Hj
Suspensions, dispersions, pastes, slurries, colloids (rheology) - 83.50.Ax
Steady shear flows, viscometric flow - 83.10.Mj
Molecular dynamics, Brownian dynamics in rheology - 82.70.Kj
Emulsions and suspensions - 82.70.Dd
Colloids - 47.57.J-
Fluid dynamics of colloidal systems - YEAR: 2008
RELATED DATABASES
PUBLICATION DATA
1070-6631 (print)
1089-7666 (online)
AIP
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