Granular motion in rotating drums: bed turnover time and slumping-rolling transition

YL Ding, Robin Forster, Jonathan Seville, David Parker

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Theoretical models are presented for calculation of the bed turnover time in both the slumping and rolling modes and the slumping-to-rolling transition in rotating drums with less than 50% volumetric fill of free-flowing granular materials. It is suggested that the transition from slumping to rolling occurs when the two turnover times are equal. The model for the bed turnover time in rolling beds is compared with the data reported in the literature. Very good agreement has been obtained. The bed turnover time is also employed to define a new Froude number for constructing the bed behaviour diagram. It is shown that the bed behaviour diagram based on the new Froude number brings the data points for sand and limestone into single curves. The implications of the bed turnover time for solid mixing and heat transfer within particle beds are also discussed. (C) 2002 Elsevier Science B.V All rights reserved.
Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalPowder Technology
Volume124(1)
Issue number1-2
Publication statusPublished - 8 Apr 2002

Keywords

  • solids motion
  • rotating drums
  • transition
  • bed turnover time
  • slumping mode
  • rolling mode
  • bed behaviour diagram

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