Lane change in flows through pillared microchannels
S. De (Eindhoven University of Technology)
J van der Schaaf (Eindhoven University of Technology)
Niels G. Deen (Eindhoven University of Technology)
J.A.M. Kuipers (Eindhoven University of Technology)
E.A.J.F. Peters (Eindhoven University of Technology)
Johan T. Padding (TU Delft - Intensified Reaction and Separation Systems)
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Abstract
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 slowmoving lanes. Particle image velocimetry measurements through a pillared microchannel provide experimental evidence of these instabilities at a very low Reynolds number (< 0.01). The instability is characterized by a rapid increase in spatial and temporal fluctuations of velocity components and pressure at a critical Deborah number. We characterize under which conditions these strong instabilities arise.
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