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3.8 T Fluid–Solid Fluidized Bed Reactors w o-Phase, 211
Figure 3.59 Flow pattern in a fluidized bed based on the three-phase model of Le unii. enspiel–K v
The following equation correlates the initial bubble size with the type of distributor plate.
For porous plates (Mori and en, 1975), W
d 0.00376( u) u 2 (3.502)
bub,o s fm
whereas for perforated plates,
Du ( u ) 0.4
2
d 0.347 s fm (3.503)
bub,o
n 4
where n is the number of perforations (orifices on the plate). For typical distrib utors, n is
in the range 4–3100. In these equations, CGS units should be used.
The maximum bubble size can be e v aluated as follo ws:
0.4
2
d 0.652 D u ( u ) (3.504)
bub,ma x 4 s fm