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Issue 8, 2018
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Purely-elastic flow instabilities and elastic turbulence in microfluidic cross-slot devices

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Abstract

We experimentally investigate the dynamics of viscoelastic fluid flows in cross-slot microgeometries under creeping flow conditions. We focus on the unsteady flow regime observed at high Weissenberg numbers (Wi) with the purpose of understanding the underlying flow signature of elastic turbulence. The effects of the device aspect ratio and fluid rheology on the unsteady flow state are investigated. Visualization of the flow patterns and time-resolved micro-particle image velocimetry were carried out to study the fluid flow behavior for a wide range of Weissenberg numbers. A periodic flow behavior is observed at low Weissenberg numbers followed by a more complex dynamics as Wi increases, eventually leading to the onset of elastic turbulence for very high Weissenberg numbers.

Graphical abstract: Purely-elastic flow instabilities and elastic turbulence in microfluidic cross-slot devices

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Publication details

The article was received on 03 Jun 2017, accepted on 30 Oct 2017 and first published on 29 Jan 2018


Article type: Paper
DOI: 10.1039/C7SM01106G
Citation: Soft Matter, 2018,14, 1344-1354
  • Open access: Creative Commons BY-NC license
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    Purely-elastic flow instabilities and elastic turbulence in microfluidic cross-slot devices

    P. C. Sousa, F. T. Pinho and M. A. Alves, Soft Matter, 2018, 14, 1344
    DOI: 10.1039/C7SM01106G

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