Sheared active fluids: thickening, thinning and vanishing viscosity

Details Sheared active fluids: thickening, thinning and vanishing viscosity Sheared active fluids: thickening, thinning and vanishing viscosity

2010-02-02

arxiv.org/abs/1002.0517v1

Phys. Rev. E 81, 051908 (2010)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 10 figures

Scientific paper

10.1103/PhysRevE.81.051908

We analyze the behavior of a suspension of active polar particles under shear. In the absence of external forces, orientationally ordered active particles are known to exhibit a transition to a state of non-uniform polarization and spontaneous flow. Such a transition results from the interplay between elastic stresses, due to the liquid crystallinity of the suspension, and internal active stresses. In the presence of an external shear we find an extremely rich variety of phenomena, including an effective reduction (increase) in the apparent viscosity depending on the nature of the active stresses and the flow-alignment property of the particles, as well as more exotic behaviors such as a non-monotonic stress/strain-rate relation and yield stress for large activities.

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