Ripple formation in a librating cylinder filled with fluid

Abstract eng:
The dynamics of granular medium in filled with fluid librating horizontal cylinder is experimentally studied. When the cylinder rotated sufficiently rapidly, the granular medium develops the annular layer near the cylindrical wall. The interface between fluid and sand is smooth and axisymmetric. Librations of the cylinder provoke the appearance of quasi-steady relief on the sand surface in the form of regular dunes with crests oriented parallel to the axis of rotation. It is found, that the threshold of ripple formation is determined by the dimensionless librational amplitude. In the supercritical domain, the existence of azimuthal drift of dunes is revealed. Dependently on experimental conditions, the dune migration can be directed either parallel or anti-parallel with respect to the cylinder rotation.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket