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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   
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