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Non-locality and viscous drag effects on the shear localisation in soft-glassy materials

Abstract : We study the Couette flow of a quasi-2d soft-glassy material in a Hele–Shaw geometry. The material is chosen to be above the jamming point, where a yield stress σY emerges, below which the material deforms elastically and above which it flows like a complex fluid according to a Herschel–Bulkley (HB) rheology. Simultaneously, the effect of the confining plates is modelled as an effective linear friction law, while the walls aside the Hele–Shaw cell are sufficiently close to each other to allow visible cooperativity effects in the velocity profiles (Goyon et al., 2008). The effects of cooperativity are parametrized with a steady-state diffusion–relaxation equation for the fluidity field f = γ ˙ / σ , defined as the ratio between shear rate γ ˙ and shear stress σ. For particular rheological flow-curves (Bingham fluids), the problem is tackled analytically: we explore the two regimes σ ≫ σY and σ ≈ σY and quantify the effect of the extra localisation induced by the wall friction. Other rheo-thinning fluids are explored with the help of numerical simulations based on lattice Boltzmann models, revealing a robustness of the analytical findings. Synergies and comparisons with other existing works in the literature (Barry et al., 2011) are also discussed
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Submitted on : Thursday, November 19, 2015 - 11:18:46 AM
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A. Scagliarini, Benjamin Dollet, M Sbragaglia. Non-locality and viscous drag effects on the shear localisation in soft-glassy materials. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2015, A Collection of Papers Presented at the 10th Eufoam Conference, Thessaloniki, Greece,7-10 July, 2014, 473, pp.133--140. ⟨10.1016/j.colsurfa.2015.01.090⟩. ⟨hal-01225624⟩



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