Oscillations of a solid sphere falling through a wormlike micellar fluid

Details Oscillations of a solid sphere falling through a wormlike micellar fluid Oscillations of a solid sphere falling through a wormlike micellar fluid

2002-05-24

arxiv.org/abs/physics/0205067v1

Physics

Fluid Dynamics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevE.67.065301

We present an experimental study of the motion of a solid sphere falling through a wormlike micellar fluid. While smaller or lighter spheres quickly reach a terminal velocity, larger or heavier spheres are found to oscillate in the direction of their falling motion. The onset of this instability correlates with a critical value of the velocity gradient scale $\Gamma_{c}\sim 1$ s$^{-1}$. We relate this condition to the known complex rheology of wormlike micellar fluids, and suggest that the unsteady motion of the sphere is caused by the formation and breaking of flow-induced structures.

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