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Elias Harika, Sebastien Jarny, Philippe Monnet, Jean Bouyer, Michel Fillon
Effect of water pollution on rheological properties of lubricating oil
Appl. Rheol. 21:1 (2011) 12613 (9 pages)
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This paper presents an experimental study of the rheological behaviour of water-in-oil mixtures without any additive, up to
10 % of mass water concentration, where the mixture is considered to be a Newtonian fluid. The selected oil is a classical turbine
mineral oil. Viscosity was measured for five temperatures, ranging from 10 to 80 C, for droplet size below 30 $\mu$m. A light
decrease of viscosity was detected for water concentrations below 0.1 %. For concentrations greater than 0.2 %, viscosity
increases with water concentration. Moreover, the variation of viscosity with temperature shows good correlation with both
Walther model and Mac Coull & Walther model. Finally, a new model of water-in-oil mixtures viscosity as a function of temperature
and concentration was defined.
► Cite this publication as follows:
Harika E, Jarny S, Monnet P, Bouyer J, Fillon M: Effect of water pollution on rheological properties of lubricating oil, Appl. Rheol. 21 (2011) 12613.
Sandrine Paumier, Anne Pantet, Philippe Monnet, Nathalie Touze-Foltz
Evaluation of the viscoelastic properties of a clay material using a flow curve
Appl. Rheol. 19:2 (2009) 23824 (11 pages)
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The specific properties of bentonite such as hydration, swelling,water absorption, viscosity, yield stress and thixotropy make
it a valuable material in the form of mineral powder for a wide range of uses in agronomy, cosmetics and civil engineering.
A flow curve is a quick test used to evaluate the rheological basic properties of a viscous fluid. However, many bentonite dispersions
exhibit a complex flow curve, with yield stress and thixotropy area, especially at high concentration. In this study,
flow curves from raw and activated bentonites dispersed in water were acquired at 6, 8 and 10% mass concentrations. Five
stages along the flow curve were identified.To explain each stage, rheograms obtained from a dispersion made with a model
material were studied in depth. The model material was a smectite extracted from a raw bentonite then saturated with calcium
or sodium. Many homoionic and bi-ionic dispersions were prepared at various concentrations. The analysis and the
modelling of some creep-recovery tests by a Zener model showed the relationship between the initial stage in the flow curve,
named AB stage, and the viscoelastic properties of the fluid. The AB stage corresponds to the deformation of the material in
the solid state. The τB
point corresponds to an intermediate yield stress between the solid state and the start of the heterogeneous
fracturation. The study of many bi-ionic dispersions allowed drawing the evolution of the yield stress as a function of
concentration and saturation. The composition of the raw bentonites was expressed as an equivalent bi-ionic dispersion by
calculating an active smectite percentage. A good correlation was obtained at the highest concentrations between
τB from
the bi-ionic model dispersions and the raw bentonites dispersions
► Cite this publication as follows:
Paumier S, Pantet A, Monnet P, Touze-Foltz N: Evaluation of the viscoelastic properties of a clay material using a flow curve, Appl. Rheol. 19 (2009) 23824.
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