Publication: On the minimum fluidization velocity in 2D fluidized beds
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2011-02-15
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Elsevier
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Abstract
In the present study, a new correlation for the determination of the minimum fluidization velocity in 2D fluidized beds was developed. The proposed correlation was based on the experimental results obtained in 2D fluidized beds with different particle sizes, bed thicknesses and bed heights. Thus, the proposed correlation
depends only on the nondimensional variable t/dp, where t is the bed thickness and dp is the particle size. The
proposed correlation was compared with other experimental results that can be found in the literature, and
two different trends were observed. Namely, one set of experimental results was in accordance with the
proposed correlation, while the other set deviated from the theoretical results. In particular, the minimum
fluidization velocities of the experimental results were greater than the predicted values of the proposed
correlation. In view of the differences in the experimental conditions, the observed discrepancies may be
attributed to the effects of electrostatic charge and particle shape. In addition, the experimental fluidization–
defluidization curves were compared to the theoretical results of Jackson's model, and the parameters were
fitted to the experimental data. However, Jackson's model is based on a 1D bed; thus, general parameters
could not be obtained for a bed with a fixed particle size and thickness due to the two dimensional voidage
distribution in the bed and bed cohesion effects, which are a result of electrostatic forces and are not considered in Jackson's model
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Keywords
Minimum fluidization velocity, 2D fluidized bed, 2D fluidized beds, Wall effects
Bibliographic citation
Powder Technology, 2011, vol. 207, n. 1-3, p. 145-153