Patterns in hydraulic ripples with binary granular mixtures

  • Caps H
  • Vandewalle N
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An experimental study of a binary granular mixture submitted to a transient shear flow in a cylindrical container is reported. The formation of ripples with a spiral shape is observed. The appearance of phase segregation in those spiral patterns is shown. The relative grain sizé between sand species is found to be a relevant parameter leading to phase segregation. However, the relative repose angle is an irrelevant parameter. The formation of sedimentary structures is also presented. They result from a ripple climbing process. The "sub-critical" or "super-critical" character of the lamination patterns is shown to depend on the rotation speed of the container. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Instability
  • Patterns formation
  • Phase segregation

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  • H. Caps

  • N. Vandewalle

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