Page 212 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Table 12. Some model parameters after Billet [177] for random packings
Parameter Pall ring Pall ring Pall ring Norpac
metal ceramic plastic plastic
N, 1/m 3 6100 6660 6400 7530
2.45 2.45 1.95 1.025
# 0.81 0.83 0.92 1
X 0.525 0.57 0.64 0.61
e 0.96 0J2 0.74 0.94
a 105 110 120 100
1 0.75 1.15 0.75
C o
Q 3.6 4.0 4.4 1.45
c 2 2.18 2.2 2.18 2.16

Billet [177] proposed also the equation

2
„ (La,} (L ,a)
(80)

For dumped packing

•I , (81)

3
where N is the number of the packing elements per m of the packed volume
and h their height in m. The values of Q, are presented in Table 10.
For calculation of the dynamic liquid holdup of random and structured
packings below the loading point, Engel et al. [326] present the equation:

(82)