Page 213 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

203

The mean relative deviation of the equation is about 15%. About 91%
of the used experimental data are within a 30% band. It is to be expected that
the great difference between the experimental and predicted data is connected
with the great variety of packmgs for which the constants in the equation are
determined.
For calculation of H, under the loading point, Billet and Schultes [316]
proposed the equation:

3/3
(83)

Here the hydraulic surface area Of, under the loading point is calculated by the
equations:

for Re L<5

ls
J
— = Cf,Rel Frl ; (84)
a

forRep-5

3S
J
^- = 0,85C hRe° L Frl . (85)
a
The experimental constant Q, for different types and dimensions of packings is
given in Table 10.

3.2.1.2.1.3.2. Liquid holdup over the loading point
With increasing of the friction forces between the gas and the liquid
phases in the area of the loading point, their influence on the liquid holdup can
be neglect no more. Typical curves for the influence of the gas phase on the
liquid holdup, in case of metal Bialecki ring, taken from Billet [177], are
presented in Fig. 17.
For determination of the liquid holdup over the loading point Otake and
Kimura [81] presented a graphical method in coordinates:

for 5<^<
L