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Using symmetry to control viscoelastic waves in pillar arrays

Beech, Jason P LU ; Ström, Oskar E LU orcid ; Turato, Enrico LU orcid and Tegenfeldt, Jonas O LU orcid (2023) In RSC Advances 13(45). p.31497-31506
Abstract

Solutions of macromolecules exhibit viscoelastic properties and unlike Newtonian fluids, they may break time-reversal symmetry at low Reynolds numbers resulting in elastic turbulence. Furthermore, under some conditions, instead of the chaotic turbulence, the result is large-scale waves in the form of cyclic spatial and temporal concentration variations, as has been shown for macromolecular DNA flowing in microfluidic pillar arrays. We here demonstrate how altering the symmetry of the individual pillars can be used to influence the symmetry of these waves. We control the extent of instabilities in viscoelastic flow by leveraging the effects of the symmetry of the pillars on the waves, demonstrating suppressed viscoelastic fluctuations... (More)

Solutions of macromolecules exhibit viscoelastic properties and unlike Newtonian fluids, they may break time-reversal symmetry at low Reynolds numbers resulting in elastic turbulence. Furthermore, under some conditions, instead of the chaotic turbulence, the result is large-scale waves in the form of cyclic spatial and temporal concentration variations, as has been shown for macromolecular DNA flowing in microfluidic pillar arrays. We here demonstrate how altering the symmetry of the individual pillars can be used to influence the symmetry of these waves. We control the extent of instabilities in viscoelastic flow by leveraging the effects of the symmetry of the pillars on the waves, demonstrating suppressed viscoelastic fluctuations with relevance for transport and sorting applications, or conversely opening up for enhanced viscoelasticity-mediated mixing. The onset of waves, which changes flow resistance, occurs at different Deborah numbers for flow in different directions through the array of triangular pillars, thus breaking the symmetry of the flow resistance along the device, opening up for using the occurrence of the waves to construct a fluidic diode.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
RSC Advances
volume
13
issue
45
pages
10 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85176235692
  • pmid:37901264
ISSN
2046-2069
DOI
10.1039/d3ra06565k
language
English
LU publication?
yes
additional info
This journal is © The Royal Society of Chemistry.
id
e9e23915-ff33-4d09-b070-fca5fb909326
date added to LUP
2023-11-23 21:33:48
date last changed
2024-04-21 07:15:08
@article{e9e23915-ff33-4d09-b070-fca5fb909326,
  abstract     = {{<p>Solutions of macromolecules exhibit viscoelastic properties and unlike Newtonian fluids, they may break time-reversal symmetry at low Reynolds numbers resulting in elastic turbulence. Furthermore, under some conditions, instead of the chaotic turbulence, the result is large-scale waves in the form of cyclic spatial and temporal concentration variations, as has been shown for macromolecular DNA flowing in microfluidic pillar arrays. We here demonstrate how altering the symmetry of the individual pillars can be used to influence the symmetry of these waves. We control the extent of instabilities in viscoelastic flow by leveraging the effects of the symmetry of the pillars on the waves, demonstrating suppressed viscoelastic fluctuations with relevance for transport and sorting applications, or conversely opening up for enhanced viscoelasticity-mediated mixing. The onset of waves, which changes flow resistance, occurs at different Deborah numbers for flow in different directions through the array of triangular pillars, thus breaking the symmetry of the flow resistance along the device, opening up for using the occurrence of the waves to construct a fluidic diode.</p>}},
  author       = {{Beech, Jason P and Ström, Oskar E and Turato, Enrico and Tegenfeldt, Jonas O}},
  issn         = {{2046-2069}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{45}},
  pages        = {{31497--31506}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{RSC Advances}},
  title        = {{Using symmetry to control viscoelastic waves in pillar arrays}},
  url          = {{http://dx.doi.org/10.1039/d3ra06565k}},
  doi          = {{10.1039/d3ra06565k}},
  volume       = {{13}},
  year         = {{2023}},
}