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Formation of structural steady states in lamellar/sponge phase-separating fluids under shear flow

Author

Listed:
  • Panizza, P.
  • Courbin, L.
  • Cristobal, G.
  • Rouch, J.
  • Narayanan, T.

Abstract

We investigate the effect of shear flow on a lamellar-sponge phase-separating fluid when subjected to shear flow. We show the existence of two different steady states (droplets and ribbons structures) whose nature does not depend on the way to reach the two-phase unstable region of the phase diagram (temperature quench or stirring). The transition between ribbons and droplets is shear thickening and its nature strongly depends on what dynamical variable is imposed. If the stress is fixed, flow visualization shows the existence of shear bands at the transition, characteristic of coexistence in the cell between ribbons and droplets. In this shear-banding region, the viscosity oscillates. When the shear rate is fixed, no shear bands are observed. Instead, the transition exhibits a hysteretic behavior leading to a structural bi-stability of the phase-separating fluid under flow.

Suggested Citation

  • Panizza, P. & Courbin, L. & Cristobal, G. & Rouch, J. & Narayanan, T., 2003. "Formation of structural steady states in lamellar/sponge phase-separating fluids under shear flow," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 322(C), pages 38-54.
    • Handle: RePEc:eee:phsmap:v:322:y:2003:i:c:p:38-54
    DOI: 10.1016/S0378-4371(02)01811-3
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