Phenomenology and physical origin of shear localization and shear banding in complex fluids

By G. Ovarlez, S. Rodts, X. Chateau, P. Coussot. 2009

268 citations recorded by the source corpus.

We review and compare the phenomenological aspects and physical origin of shear localization and shear banding in various material types, namely emulsions, suspensions, colloids, granular materials, and micellar systems. It appears that shear banding, which must be distinguished from the simple effect of coexisting static-flowing regions in yield stress fluids, occurs in the form of a progressive evolution of the local viscosity toward two significantly different values in two adjoining regions of the fluids in which the stress takes slightly different values. This suggests that from a global point of view, shear banding in these systems has a common physical origin: Two physical phenomena (for example, in colloids, destructuration due to flow and restructuration due to aging) are in competition, and depending on the flow conditions, one of them becomes dominant and makes the system evolve in a specific direction.

Subfields: Biomedical Engineering, Fluid Flow and Transfer Processes, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/2b484e63f89dbfec693e11cc210f3474b70dae6b

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In Biomedical Engineering

In Fluid Flow and Transfer Processes

In Materials Chemistry

Citations in the corpus

Yielding to Stress: Recent Developments in Viscoplastic Fluid Mechanics (2014, background): “Importantly, these bifurcations imply that there is a range of shear rates 0 < γ̇ < γ̇c for which steady flows are unattainable; if a rheological test sets a shear rate within this range, 0 < γ̇ < γ̇c, the spatially homogeneous flow unstably breaks up into shear bands (Ovarlez et al. 2009) (cf.”
Modeling the mechanics of amorphous solids at different length scale and time scale (2011, background): “The most striking rate effect is that shear bands occur in complex yield-stress fluids only at low strain rates while at higher strain rates, homogeneous flow is recovered [48, 49, 141, 187].”
On the existence of a simple yield stress fluid behavior (2012, background): “From this plot, it clearly appears that (i) the thixotropic system (bentonite suspension) exhibits an abrupt transition from flow to rest, as expected from the shear-banding behavior of these materials observed in cone-and-plate geometry [12, 7], whereas (ii) concentrated emulsion, foam and Carbopol”
Yield stress fluid flows: A review of experimental data (2014, background): “Other observations of the flow of yield stress fluids in cone and plate geometry concern thixotropic materials (Bentonite suspension [10] and Ludox [9]).”