Lane change in flows through pillared microchannels

Journal article (2017)

Authors

S. De Eindhoven University of Technology
J. van der Schaaf Eindhoven University of Technology
Niels G. Deen Eindhoven University of Technology
J. A.M. Hans Kuipers Eindhoven University of Technology
E.A.J.F. Peters Eindhoven University of Technology
J.T. Padding Intensified Reaction and Separation Systems - Mechanical, Maritime and Materials Engineering
Research Group
Intensified Reaction and Separation Systems (Mechanical, Maritime and Materials Engineering) (TU Delft)
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Published Date

2017

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Intensified Reaction and Separation Systems

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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