Phys. Rev. Lett. 102, 058302 (2009) [4 pages]Velocity Oscillations in Microfluidic Flows of Concentrated Colloidal SuspensionsReceived 27 June 2008; published 4 February 2009 We study the pressure-driven flow of concentrated colloids confined in glass microchannels at the single-particle level using fast confocal microscopy. For channel to particle size ratios 2a/D̅ ≲30, the flow rate of the suspended particles shows fluctuations. These turn into regular oscillations for higher confinements (2a/D̅ ≃20). We present evidence to link these oscillations with the relative flow of solvent and particles (permeation) and the effect of confinement on shear thickening. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.058302
DOI:
10.1103/PhysRevLett.102.058302
PACS:
83.80.Hj, 83.50.−v, 83.60.Rs, 83.60.Wc
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