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Link between permanent shear-banding and local concentration fluctuations in suspensions of compressible microgels

Bassu, Gavino ; Houston, Judith E. ; Lara-Peña, Mayra A. ; Kriegs, Hartmut ; Lettinga, Minne Paul ; Porcar, Lionel ; Scotti, Andrea LU orcid and Laurati, Marco (2024) In Physics of Fluids 36(11).
Abstract

We uncover the occurrence of shear banding in dense suspensions of compressible microgels. Velocimetry measurements evidence the presence of permanent but unsteady shear-banding for sufficiently small Peclet numbers, with the formation of a central plug-like flow. Small-angle neutron scattering experiments under shear link the observed banding phenomenon to structural variations along the velocity gradient, providing a connection between the arrested band and the increase in structural correlations associated with changes in the local packing fraction. This provides unique evidence of a shear-concentration coupling mechanism in jammed suspensions of compressible particles.

Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics of Fluids
volume
36
issue
11
article number
113116
publisher
American Institute of Physics (AIP)
external identifiers
  • scopus:85209767933
ISSN
1070-6631
DOI
10.1063/5.0237526
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 Author(s).
id
28f26060-cdd4-444a-8f77-21aacf3ae0fb
date added to LUP
2025-01-15 10:28:36
date last changed
2025-04-04 15:27:41
@article{28f26060-cdd4-444a-8f77-21aacf3ae0fb,
  abstract     = {{<p>We uncover the occurrence of shear banding in dense suspensions of compressible microgels. Velocimetry measurements evidence the presence of permanent but unsteady shear-banding for sufficiently small Peclet numbers, with the formation of a central plug-like flow. Small-angle neutron scattering experiments under shear link the observed banding phenomenon to structural variations along the velocity gradient, providing a connection between the arrested band and the increase in structural correlations associated with changes in the local packing fraction. This provides unique evidence of a shear-concentration coupling mechanism in jammed suspensions of compressible particles.</p>}},
  author       = {{Bassu, Gavino and Houston, Judith E. and Lara-Peña, Mayra A. and Kriegs, Hartmut and Lettinga, Minne Paul and Porcar, Lionel and Scotti, Andrea and Laurati, Marco}},
  issn         = {{1070-6631}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{11}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Physics of Fluids}},
  title        = {{Link between permanent shear-banding and local concentration fluctuations in suspensions of compressible microgels}},
  url          = {{http://dx.doi.org/10.1063/5.0237526}},
  doi          = {{10.1063/5.0237526}},
  volume       = {{36}},
  year         = {{2024}},
}