Time-dependent behaviour of industrial granular materials under vibration: Modelling and phenomenology.

Several industrial and fundamental studies focus on the consolidation of granular materials as this covers many technological fields. When a material is shaken, it densifies. The energy needed to compact or decompact powder column great interest in handling, filling transport operations. This work dynamic behaviour four materials–wheat flour, sericite, microcrystalline cellulose glass beads–when submitted vertical vibration using particle damper. effect wave was studied by varying two dimensionless parameters: relative acceleration, Γ frequency, Ω including relaxation time between periods. Our results show that despite cohesiveness samples, their compaction dynamics occurs at least two-compaction steps succession stretched exponentials can model, denoted herein generalised KWW model. Also absence periods leads fluidisation during first vibration. Fluidisation phenomena–the convective movement, jets, bubbling slugging–appear enhance reorganisation giving rise higher packing fractions depending nature grains operational conditions. A classification observed behaviours proposed related kinetics.