Fig. 8shows the validity of equation proposed and
predicted from the correlations of the heat transfer coefficients in the annulus for the classical spouted bed and
in the fixed bed. The Nusselt numbers prediction by the
equations from published data are prominently above the experimental values in this work, as indicated by the
slopes of straight line equal to 9.05 forMacchi, Bi, Legros, and Chaouki (1999) and 2.4 for Balakrishnan
and Pei (1974). However, the predictable capability by
the proposed equation shows a relatively good tendency,
with the slope being 0.91. This difference indicates that
the use of correlations from other equipment types
may not reasonably be applied to predict the heat transfer coefficient in the two-dimensional spouted bed with
draft plates.