Phys. Rev. E 67, 065301(R) (2003) [4 pages]Oscillations of a solid sphere falling through a wormlike micellar fluid
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 Γc∼1s-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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.67.065301
DOI:
10.1103/PhysRevE.67.065301
PACS:
47.50.+d, 83.50.Jf, 83.60.Wc
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