- Quasi-periodic and irregular motion of a solid sphere falling through a thixotropic yield-stress fluid
- APPLIED PHYSICS EXPRESS
- Volume | Issue number
- 10 | 11
- Article number
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
We report the observation of the oscillatory and irregular motion of solid spheres settling under the influence of gravity in a thixotropic yield-stress fluid, namely, a suspension of Laponite. The size of the ball and the aging time of the Laponite suspension are found to be two important parameters that determine whether oscillations occur. The irregular motion may be related to the existence of an unstable flow region and shear banding as is concluded from comparisons with rheological measurements, namely, the flow curve and creep tests, using the same Laponite suspensions.
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