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Interfacial Instability of a Confined Suspension Under Oscillating Shear

In: Traffic and Granular Flow ’07

Author

Listed:
  • Maniya Maleki

    (PMMH, UMR 7636 du CNRS, ESPCI
    Institute for Advanced Studies in Basic Sciences (IASBS))

  • Héctor Pacheco

    (Departamento de Fisica, CINVESTAV-IPN)

  • Carlos Ruiz Suárez

    (Departamento de Fisica, CINVESTAV-IPN)

  • Eric Clément

    (PMMH, UMR 7636 du CNRS, ESPCI)

Abstract

Summary We study experimentally the interfacial stability of a polystyrene particle suspension sheared harmonically by an upper flow free of particles. The suspension is confined in a rectangular Hele-Shaw cell and initially sedimented. The suspension can be made almost no buoyant by addition of salt in water. When an oscillating flow is applied to the upper flow, we monitor as a function of the amplitude and frequency, the interfacial dynamics. We observe at increasing shear, the interface going from compaction to expansion, and at higher shear, up to ripple formation. We show that the amplitude threshold for ripple formation decreases with frequency. We also study the effect of the buoyancy when tilting the cell or by adding salt.

Suggested Citation

  • Maniya Maleki & Héctor Pacheco & Carlos Ruiz Suárez & Eric Clément, 2009. "Interfacial Instability of a Confined Suspension Under Oscillating Shear," Springer Books, in: Cécile Appert-Rolland & François Chevoir & Philippe Gondret & Sylvain Lassarre & Jean-Patrick Lebacq (ed.), Traffic and Granular Flow ’07, pages 621-627, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-77074-9_68
    DOI: 10.1007/978-3-540-77074-9_68
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