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204 3. Heterogeneous Processes and Reactor Analysis

Table 3.12

Equations to calculate n and u ter for different Re ter
Re ter n u ter
Re ter 0.2 4.65 20( d / D ) 4.65 d p 2 ( f g )
p
p
18

0.2 Re ter 1.0 [4.35 1.75 ( d / D )] Re 0.03 4.35 ⋅ Re 0.03 d 2 p ( f g )
p
p
18
d 2 ( g )
1.0 Re ter 2.0 [4.45 18( d / D )] Re 0.1 4.45 Re 0.1 p p f
p
18
d 1.14 p [( ) ]g f 0.71
p
2.0 Re ter 200 [4.45 18( d / D )] Re 0.1 4.45 Re 0.1 0.153
0.43 0.29 f
p

d 1.14 p [( ) ]g f 0.71
p
0.153
200 Re ter 500 4.4 Re –0.1
0.43 0.29
f
d  p ( f ) g  0.5
p
Re ter 500 2.39 1.74  
  f  

In Figure 3.56, eq. (3.484) is plotted for se v eral v alues of A found in the original paper
of Foscolo and Gilibaro (1984) (0.1–0.4) and for n = 3 representing an intermediate v alue
of Re (0.2 < Re < 500).
ter ter
The roots of the equation represent the v alues of . So,
t
(a) If 1 > > > , the fluidization is of Type A and more specifically,
t1
t2
fm
• particulate, in the re gions < < and > t2
f
t1
f
fm
• type A bubbling, in the re gion < < t2
t1
f
This is the case of A = 0.4 and A = 0.3
(b) If <0.4 (or generally lo , wer than ),the fluidization is of A and more specif- ype T
t1
fm
ically,
• particulate, in the re gion < < t2
fm
f
• Type A bubbling, in the re gion > t2
f
This is the case of A = 0.1.