Link between permanent shear-banding and local concentration fluctuations in suspensions of compressible microgels
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.
Authors
- Mayra A. Lara-Peña (ORCID: https://orcid.org/0000-0001-6714-3653)
- Andrea Scotti (ORCID: https://orcid.org/0000-0002-8988-330X)
- Hartmut Kriegs (ORCID: https://orcid.org/0000-0001-5856-1618)
- Marco Laurati (ORCID: https://orcid.org/0000-0003-1334-5940)
- Gavino Bassu (ORCID: https://orcid.org/0000-0001-8520-9919)
- Lionel Porcar (ORCID: https://orcid.org/0000-0003-4674-7591)
- Judith E. Houston (ORCID: https://orcid.org/0000-0001-5205-3620)
- M. P. Lettinga (ORCID: https://orcid.org/0000-0002-1894-2691)
Institutions
- Universidad de Guanajuato (MX)
- Forschungszentrum Jülich (DE)
- Lund University (SE)
- European Spallation Source (SE)
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (IT)
- Institut Laue-Langevin (FR)
- University of Florence (IT)
- KU Leuven (BE)
Publication Details
- Journal
- Physics of Fluids
- Published
- 2024-11-01
- DOI
- https://doi.org/10.1063/5.0237526
- Citations
- 4
- Primary Topic
- Rheology and Fluid Dynamics Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.87
Funders
- Knowledge Foundation
- European Soft Matter Infrastructure
- Deutsche Forschungsgemeinschaft
- VINNOVA
- Knut och Alice Wallenbergs Stiftelse
- Vetenskapsrådet