Page 195 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

185

2
L a
Fr L = is the Froude number, and Ha is the total holdup under the loading
g
point. H t is the total holdup for the corresponding regime. The value of Cpg is
given in Table 6.

3.2.1.2.1.2. Loading, flooding and maximum efficient capacity
In the area of the critical points in loading and flooding, a great number
"W
of investigations are carried out [22, 36-39]. Usually, they use the ratio —-, or
0
in the critical points as a function of the ratio of the friction to the
L.p L
gravity forces, A dimensionless number equal to the ratio of the packing
2
pressure drop to the weight of the liquid per m of the packing cross-section is
offered by Zhavoronkov [22]. The following equation is proposed:

_ AP W jp PG
G
gp LH 2 p L

w 2 aw
where Fr r =
G
gd k 4ge>'
In his method for determination of the loading and flooding,
Zhavoronkov used the value of y/ for dry packings (Eq. (15)) and the equation:

(40)

In [22] Zhavoronkov presented the equation (40) in graphical form.
Later [4] he proposed the equation:

T = B,(1-B 2A? , (41)