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N. Ouari, A. Kaci, A. Tahakourt, M. Chaouche
Rheological behaviour of fibre suspensions in non-Newtonian fluids
Appl. Rheol. 21:5 (2011) 54801 (10 pages)
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The influence of short fibre addition on the rheological behaviour of different non-Newtonian fluids is investigated
experimentally. Two types of suspending fluids are considered: power-law shear thinning fluids and yieldstress
shear-thinning fluids. The power-law suspending fluids consist of aqueous xanthan solutions at different
concentrations. The yield stress fluids are mortar tile adhesives characterised by different rheological
parameters. The flow curves of the suspensions at different fibre contents are determined at controlled stresses.
Three rheological parameters are inferred from the flow curves: the yield stress, the consistency and the fluidity
index. The influence of the fibres on the rheological behaviour of purely shear-thinning fluids is found to
be quite similar to what can be expected for Newtonian suspending fluids. On the other hand, addition of fibres
to yield stress granular fluids leads to a qualitatively different change of their rheological properties compared
to the case of Newtonian suspending fluids. In particular, it is found that the fibres can lead to the decrease of
the apparent viscosity and the yield stress for low fibre concentrations in the case of granular suspending fluids.
Our experimental findings indicate that the models for fibre suspensions in Newtonian solvents cannot be
used straightforwardly in the case of fibre suspensions in granular materials such as building materials, ceramic
materials, etc.
► Cite this publication as follows:
Ouari N, Kaci A, Tahakourt A, Chaouche M: Rheological behaviour of fibre suspensions in non-Newtonian fluids, Appl. Rheol. 21 (2011) 54801.
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