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Fragile dense suspensions under shear rotation

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While quasi-Newtonian complex fluids under steady-state flow, dense non-Brownian suspensions exhibit complex "macro-fragile" behaviors under varying flow conditions, as revealed by abrupt shear inversions (reversals). Here, we introduce an experimental setup to systematically explore their macro-fragile response to shear rotations, where one suddenly rotates the principal axes of shear by an angle θ. This reveals a transient decrease of the shear stress under shear rotation. Moreover, the orthogonal shear stress, which vanishes in steady state, takes non-negligible values with a rich θ-dependence, changing qualitatively with ϕ, and resulting in a force that tends to reduce or enhance the direction of flow for small or large ϕ. These findings are confirmed and rationalized by particle-based numerical simulations and a recently proposed constitutive model. We show that the angular dependence of the orthogonal stress results from an interplay between hydrodynamic and contact stresses, which balance changes with ϕ.
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hal-03837785 , version 1 (03-11-2022)


  • HAL Id : hal-03837785 , version 1


Frédéric Blanc, François Peters, Jurriaan J J Gillissen, Michael E Cates, Sandra Bosio, et al.. Fragile dense suspensions under shear rotation. 2022. ⟨hal-03837785⟩
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