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Nonlocal effects in the shear banding of a thixotropic yield stress fluid
Publikationstyp
Journal Article
Publikationsdatum
2021-04-26
Sprache
English
TORE-URI
Enthalten in
Volume
6
Article Number
113301
Citation
Physical review fluids 6: 113301 (2021-11-22)
Publisher DOI
Publisher Link
ArXiv ID
We observe a novel type of shear banding in the rheology of thixotropic yield-stress fluids that is due to the coupling of both non-locality and thixotropy. The latter is known to lead to shear banding even in homogeneous stress fields, but the bands observed in the presence of non-local effects appear different as the shear rate varies continuously over the shear band. Here, we introduce a simple non-local model for the shear banding (NL-SB), and we implement it for the analysis of micron-scale rheo-MRI velocimetry measurements of a milk microgel suspension in a cone-and-plate geometry. The proposed NL-SB model accurately quantifies the cooperativity length and yields values in the order of the aggregate size in the microgel.
Schlagworte
Physics - Soft Condensed Matter
Physics - Soft Condensed Matter