Undulations of a thin granular layer induced by vertical vibration

An experimental study is performed on quasi-two dimensional waves in a thin granular layer of thickness h induced by vertical vibration with frequency f and amplitude a under atmospheric pressure. We used sesame of oval shape as well as different sizes of spherical glass and aluminum beads. Irrespec...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Physical Society of Japan 2003-06, Vol.72 (6), p.1390-1395
Main Authors: UGAWA, Akiko, SANO, Osamu
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Granular solids
Material form
Physics
Rheology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An experimental study is performed on quasi-two dimensional waves in a thin granular layer of thickness h induced by vertical vibration with frequency f and amplitude a under atmospheric pressure. We used sesame of oval shape as well as different sizes of spherical glass and aluminum beads. Irrespective of the container size L, "ripples" are observed in a thin layer which consists of spherical beads (aluminum and glass beads) for relatively small acceleration of external forcing. On the other hand "undulations" are observed in a thicker layer, which consists of sesame as well as spherical beads, for larger accelerations. In the latter, several eigen modes are observed, which is reminiscent of the buckling and bending waves in an elastic rod. Continuum model is shown to explain the observed modes. In addition to acceleration amplitude (2πf)2a/g (g: acceleration of gravity) and normalized frequency f\\sqrth/g, layer height h/d (d: particle size) and aspect ratio L/h play important roles.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.72.1390