Patterns in hydraulic ripples with binary granular mixtures

H. Caps; N. Vandewalle

doi:10.1016/s0378-4371(02)00856-7

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Patterns in hydraulic ripples with binary granular mixtures

H. Caps·N. Vandewalle

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Abstract

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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H. Caps, N. Vandewalle. 2002-02-22. Patterns in hydraulic ripples with binary granular mixtures. https://doi.org/10.1016/s0378-4371(02)00856-7

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