Stress overshoot in a simple yield stress fluid: An extensive study combining rheology and velocimetry
By T. Divoux, C. Barentin, S. Manneville. 2011
151 citations recorded by the source corpus.
We report a large amount of experimental data on the stress overshoot phenomenon which takes place during start-up shear flows in a simple yield stress fluid, namely a carbopol microgel. A combination of classical rheological measurements and ultrasonic velocimetry makes it possible to get physical insights on the transient dynamics of both the stress σ(t) and the velocity field across the gap of a rough cylindrical Couette cell during the start-up of shear under an applied shear rate . (i) At small strains (γ w. Finally, by changing the boundary conditions from rough to smooth, we show that there exists a critical shear rate s fixed by the wall surface roughness below which slip at both walls allows for faster stress relaxation and for stress fluctuations strongly reminiscent of stick-slip. Interestingly, the value of s is observed to coincide with the shear rate below which the flow curve displays a kink attributed to wall slip.
Subfields: Fluid Flow and Transfer Processes, Materials Chemistry, Pulmonary and Respiratory Medicine
View Paper: https://www.semanticscholar.org/paper/98dbcacaa77f78c15b0d6e5245e80d6cb1f73808
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In Fluid Flow and Transfer Processes
- G. Ovarlez
- Laboratoire Navier
- P. Coussot
- S. Cohen-Addad
- J. Barrat
- K. Martens
- Ezequiel Ferrero
- Alexandre Nicolas
In Materials Chemistry
- G. Ovarlez
- P. Coussot
- S. Cohen-Addad
- J. Barrat
- K. Martens
- Ezequiel Ferrero
- Alexandre Nicolas
- U. Seifert
In Pulmonary and Respiratory Medicine
Citations in the corpus
- Yield stress fluid flows: A review of experimental data (2014, background): “The impact of some parameters such as wall roughness, gap size, etc was then studied in depth [63-64] but this effect remains unexplained.”
- Deformation and flow of amorphous solids: Insights from elastoplastic models (2017, methodology): “That being said, the elastic moduli are usually only weakly affected by the preparation route, i.e., the cooling rate (Ashwin et al., 2013) and the waiting time (Divoux et al., 2011b), while other key features of the transient response to the applied shear are often found to depend on it.”
- On the existence of a simple yield stress fluid behavior (2012, background): “Structuration at rest can lead to differences between the static and dynamic yield stress [40].”