Wavelength selection of ripples in a vertically vibrating dynamically thick granular layer due to density-wave refraction - 22/01/14
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Abstract |
A numerical study was made on the wavelength selection mechanism of the ripples observed on the surface of a granular layer that is oscillated vertically. Multiple collisions of the one-dimensional array of beads show a time-dependent particle distribution, which induces a density wave. The magnitude of the wave velocity is estimated by the theory of elasticity, which reveals the refraction of the density wave in a quasi-two-dimensional granular layer. Our theory explains how the vertical excitation of particles determines the horizontal characteristic scale on the surface, or the wavelength of the ripples, which is applicable even to the saturation regime of a dynamically thick granular layer, e.g., the one that is thick enough to allow an immobilized region in the lower part.
Le texte complet de cet article est disponible en PDF.Keywords : Granular material, Dynamically thick layer, Density wave, Refraction, Wavelength, Solid–fluid transition
Plan
☆ | The paper was presented in the mini-symposium about “Recent Advances in the Mechanics of Granular and Porous Media” at the European Solid Mechanics Conference 2012 in Graz, Austria. The guest editors of this Mini-Symposium are Erich Bauer, Robert P. Behringer, Félix Darve and Lou Kondic. |
Vol 342 - N° 1
P. 52-62 - janvier 2014 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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