Flow instabilities in complex fluids: Nonlinear rheology and slow relaxations
arXiv:cond-mat/0310660 · doi:10.1063/1.1764067
Abstract
We here present two simplified models aimed at describing the long-term, irregular behaviours observed in the rheological response of certain complex fluids, such as periodic oscillations or chaotic-like variations. Both models exploit the idea of having a (non-linear) rheological equation, controlling the temporal evolution of the stress, where one of the participating variables (a "structural" variable) is subject to a distinct dynamics with a different relaxation time. The coupling between the two dynamics is a source of instability.
Proceedings of "Slow Dynamics in Complex Systems 2003" (Sendai, Japan, Nov. 2003)