Abstract
The viscoelastic properties of yield stress fluids are difficult to measure outside the linear viscoelastic regime, in particular above their yield stress. These properties are investigated for several common yield stress fluids using inertio-elastic oscillations. From this coupling between the instrument’s inertia and the viscoelasticity of the materials, the complete simple shear rheology can be determined, including viscoelasticity under flow. Findings show that the tested materials have an almost constant elasticity below and above the yield stress, even for applied stresses several times larger than the yield stress. Moreover, the temporal behavior of the materials is unambiguously determined. Concentrated Xanthan is shown to be thixotropic, while Ketchup mainly shows retarded viscoelasticity. Carbopol does not show long-term temporal dependance but apparently exhibits fracturation.
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Notes
The measurement of viscosity using the average factors defines an apparent viscosity of the material. It has been checked that the correction made in Nguyen and Boger (1987) for yield stress fluids does not change the behavior of the viscoelastic parameters.
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Benmouffok-Benbelkacem, G., Caton, F., Baravian, C. et al. Non-linear viscoelasticity and temporal behavior of typical yield stress fluids: Carbopol, Xanthan and Ketchup. Rheol Acta 49, 305–314 (2010). https://doi.org/10.1007/s00397-010-0430-4
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DOI: https://doi.org/10.1007/s00397-010-0430-4