Aggregation behavior of two spheres falling through an aging fluid.

  title={Aggregation behavior of two spheres falling through an aging fluid.},
  author={Blandine Gueslin and Laurence Talini and Benjamin Herzhaft and Y. Peysson and Catherine Allain},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={74 4 Pt 1},
We study the behavior of two spheres that settle along their line of center in a yield stress fluid that "ages:" a Laponite suspension. In such a fluid, the fluid flow behind a falling single particle can either exhibit a negative wake, i.e., an upward motion, or not, according to the stress exerted by the particle on the fluid. We show that, if their initial separation distance is smaller than 15 radii, two identical particles cluster whatever the wake's structure. In addition, in the… CONTINUE READING

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