Patterns in hydraulic ripples with binary granular mixtures

Details Patterns in hydraulic ripples with binary granular mixtures Patterns in hydraulic ripples with binary granular mixtures

2001-12-06

arxiv.org/abs/cond-mat/0112089v2

Physica A 313 (3-4): 357-364 Oct. 15 2002

Physics

Condensed Matter

Statistical Mechanics

9 pages, 9 figures, LateX (using elsart package), submitted to Phys. A

Scientific paper

10.1016/S0378-4371(02)00856-7

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 size bewteen 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.

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