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The dynamics of a fully fluidized bed of group A and group C powders subject to vertical vibration was studied in an 85mm ID transparent perspex column. Acceleration level was set to a/g=1 and 2 respectively for the two powders. Frequency was varied in the range between 5 and 60Hz. Different bed mass values corresponding to different bed heights were tested. Time series of the position of the oscillating...
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