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By Kishan B. Mathur

Publication by way of Mathur, Kishan B., Epstein, Norman

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Spouted Beds

Booklet through Mathur, Kishan B. , Epstein, Norman

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Thus experimental data for wheat are best correlated when dp is taken as the smaller dimension of the particle, this choice being justified by the observation that wheat particles align themselves vertically in the spout [137]. 3 Minimum Spouting 43 Velocity particles [134]. In practice, the most reliable and convenient method would be to determine an effective value of dp empirically in a laboratory spouting unit. An additional advantage of this procedure is that the surface charac­ teristics of the particles, which can also influence Ums [134] but are not explicitly accounted for in Eq.

1], on the other hand, gives the superficial velocity in the annulus directly. These data, which have the further advantage of covering a variation in column size, therefore provide a better means for testing the validity of Eq. 19). The comparison, shown in Fig. 3, does lend a measure of support to the theoretical equation, but some of the results for the larger columns show considerable deviations. This is perhaps not surprising, considering that bed depths used in the larger columns were generally much smaller than the maximum spoutable depths and that the theoretical analysis of M a m u r o and H a t t o r i leads only to Eq.

61 M g / m ) . T h u s experimental verification on this point is again necessary. An alternative approach to predicting gas distribution is that of Lefroy and Davidson [114]. 20) where the factor Β ( < 1 ) is the ratio ( A P s/ f f ) / [ ( A P s) m /aH xm] and can be estimated from Fig. 7. Substituting Eq. 20) into Eq. 21) Combination of Eq. 21) with Eq. 22) Since the term Β is equivalent to the empirical multiplier of H/Hm on the right-hand side of Eq.

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