Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-06-19
Physical Review E 66, 031505 (2002)
Physics
Condensed Matter
Soft Condensed Matter
submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.66.031505
We report here an extensive study of sustained oscillations of the viscosity of a complex fluid near an out-of-equilibrium transition. Using well defined protocols, we perform rheological measurements of the onion texture near a layering transition in a Couette flow. This complex fluid exhibits sustained oscillations of the viscosity, on a large time scale (500s) at controlled stress. These oscillations are directly correlated to an oscillating microstrutural change of the texture of the fluid. We observe a great diversity of dynamical behavior and we show that there is a coupling with spatial effects in the gradient v direction. This is in agreement with a carefull analysis of the temporal series of the viscosity with the dynamical system theory. This analysis indicates that the observed dynamical responses do not strictly correspond to 3-dimensional chaotic states, probably because some spatio-temporal effects are present and are likely to play an important role.
Colin Angel
Roux D.
Salmon Joseph
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