Velocity oscillations in microfluidic flows of concentrated colloidal suspensions

Velocity oscillations in microfluidic flows of concentrated colloidal suspensions

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/D[over ] less, similar30, the flow rate of the suspended particles shows fluctuations. These turn into regula...

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Veröffentlicht in:Physical review letters 2009-02, Vol.102 (5), p.058302-058302, Article 058302
Hauptverfasser: Isa, Lucio, Besseling, Rut, Morozov, Alexander N, Poon, Wilson C K
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container_title Physical review letters
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creator Isa, Lucio
Besseling, Rut
Morozov, Alexander N
Poon, Wilson C K
description 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/D[over ] less, similar30, the flow rate of the suspended particles shows fluctuations. These turn into regular oscillations for higher confinements (2a/D[over ] approximately 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.
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title Velocity oscillations in microfluidic flows of concentrated colloidal suspensions
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