Abstract
Fluidized beds of widely sized particles can be subject to segregation which when severe can result in bed defluidization. Mixing and segregation was studied in fluidized beds of circular (0.21 m diam) and square (0.61 × 0.61 m and 1.22 × 1.22m) cross-section. Experimental mixing data were obtained for binary mixtures composed of sands ranging from 160 to 2850 μm size. Several empirical relationships for mixing index were found to give inadequate predictions. A new relationship: ▪ is proposed for the estimation of the take-over velocity of a binary mixture which enables a good prediction of mixing behaviour. In this relationship, U F and U J are the minimum fluidizing velocities of the flotsam and jetsam components respectively, d R is the particle diameter ratio of the jetsam relative to the flotsam and D b is the bubble diameter at the take-over velocity.
Published Version
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