Lane change in flows through pillared microchannels

Lane change in flows through pillared microchannels

It is known that viscoelastic fluids exhibit elastic instabilities in simple shear flow and flow with curved streamlines. During flow through a straight microchannel with pillars, we found strikingly strong hydrodynamic instabilities characterized by very large transversal excursions, even leading t...

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Veröffentlicht in:Physics of fluids (1994) 2017-11, Vol.29 (11), p.113102
Hauptverfasser: De, S., van der Schaaf, J., Deen, N. G., Kuipers, J. A. M., Peters, E. A. J. F., Padding, J. T.
Format: Artikel
Sprache:eng
Schlagworte:
Deborah number
Elastic instability
Fluid dynamics
Fluid flow
Lane changing
Microchannels
Particle image velocimetry
Paths
Reynolds number
Shear flow
Variations
Velocity measurement
Viscoelastic fluids
Viscoelasticity
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Beschreibung
Zusammenfassung:It is known that viscoelastic fluids exhibit elastic instabilities in simple shear flow and flow with curved streamlines. During flow through a straight microchannel with pillars, we found strikingly strong hydrodynamic instabilities characterized by very large transversal excursions, even leading to a complete change in lanes, and the presence of fast and slow moving lanes. Particle image velocimetry measurements through a pillared microchannel provide experimental evidence of these instabilities at a very low Reynolds number (
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4995371