Page 289 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

279

Y.c. ~

^*= •
1.0 -

0,8 -

0,8 -
CO
J//
0.4-
J// • £i L= 8.3x1 O^Pa.s
0,2 -

0.0- i i i
0.000 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0,008
L, m/s

Fig. 59. Influence of superficial liquid velocity on the ratio of the effective surface area to the
total surface area of the P27-60 packing at different values of the liquid phase viscosity.

For calculating the ratio (a/a) under the critical point, the following
equations for the two cases are given:

for the plastic packings
-0.2
LfT L (192)
4
a 4xlO~ +0.75Lfil -0.2

for the ceramic packings

.-0.39
(193)
,-0,39
3
a 2.8xl0- +0.9JLfi2

The mean error of the first equation is 6% and the maximum- 19%, The
respective errors of the second equation are 5.3% and 18%.