Page 207 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

197

Based on the investigations of Gelbe [325] and of Blass and Kurtz
[341], Engel et al. [326, 327] presented the following equation for calculation
of the static holdup of different random and structured packings.

H, = 0.033exp\- 0.22^) (63)
\ OH J

For determination of the dynamic holdup under the loading point, Otake
and Okada [44] proposed the expression:

(64)

where Re d = —— and Ga M = ° rL p
2 are Reynolds and Galilei numbers
ML M
calculated with the nominal diameter of the packing elements d p.
The experimental constants in this equation are presented in Table 12.
Later on Kunugita, Otake and Yoshii [65] propose the equations both
for static and dynamic holdups:

Table 11. Experimental constants in Eq. (64) for different packings
.4 m
Re d
Random ceramic Raschig rings <S 8.10 0.51
Random ceramic Raschig rings >5 6.28 0.676
Arrange ceramic Raschig rings <10 7.43 0.51
Arrange ceramic Raschig rings >10 4.69 0.676
Ceramic Berl saddles >10 12.7 0.575
Spheres >10 4.51 0.676
Piece pacMng < jo 10.1 0.49
Ceramic Raschig rings < 10 13.32 0.565