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2007 EPL 78 44004 (4pp) doi: 10.1209/0295-5075/78/44004
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Abstract.
We find that a column of glass beads exhibits a well-defined transition between two phases that differ in their resistance to shear. Pulses of fluidization are used to prepare static sedimented states with well-defined particle volume fractions 
in the range 0.57–0.63. The resistance to shear is determined by slowly inserting a rod into the column of beads. Force measurements and bed height measurements both indicate that the transition occurs at = 0.60 for a range of speeds of the rod.
PACS numbers: 45.70.Cc, 81.05.Rm, 45.70.-n
Print publication: Issue 4 (May 2007) |
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