By J. G. Yates

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78) Here ελ is the freeboard voidage for elutriation of single-sized particles, and 44 Some fundamental aspects offluidization Usi (assumed equal to U - Ut) is the velocity of solids of size dpi. 3 Rep~ 25 for D for Rep^Re. 38/D Rep = pJU-Ut)d P μ The Wen-Chen correlation compares very well with a great deal of published data and has the advantage over many such predictive rela­ tionships in making specific allowance for the vessel diameter D. 1 Mixing A major feature of gas fluidized beds of particles of uniform density is the high degree of solids mixing that occurs in the freely bubbling regime.

82) where the dimensionless bubble shape factor φΗ is given by: φ„ = {1 - 0 . 83) where σ = 7 . 84) Umi)} 48 Some fundamental aspects offluidization and h is the height above the distributor. 8 m diameter) semicylindrical bed. The motion of solid particles in a fluidized bed can also be influenced by arranging for an uneven distribution of gas flow through the distributor plate. 24). 24 Pair of two-dimensional cells showing mechanism of'Gulf Stream' circulation (From Merry and Davidson121) this way an excess of particles was moved upwards in bubble wakes in the outer regions while in the centre of the bed, due to the relative scarcity of bubbles in that region, particles were moved predominantly downwards.

72) The authors claim good agreement between prediction and experiment although the number and range of systems studied was somewhat limited. :·. lie Upward-moving "dispersed solids Downward-moving : \

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