Page 210 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

200

for the turbulent regime

(73)

where Re 4L = ' and/is the friction factor.

The comparison of the experimental data for Raschig rings and Berl
saddles, collected by Leva [28], shows that all of them can be described by Eq.
3
1/3
(73) with (f/2g) =Q34 at liquid flow rates between 1.36xl0" to 1.36xl(T
3 2
m /m s. With this constant the equation becomes
(74)

The comparison of the experimental data and this equation is presented in Fig.
16.

t 5 " • 3«« | 1 1 1 1 J 1 1 1 **| A J 1 1
Rascdig rings
- X W"
A 5/8"
1"
0 1ft» # JP+& —
7 2" Metal
§•
a 10' —
o Plat >^W Z
-
•c im
5 /* *
E - If' Jk'
c Si / Mt' Berl ~
§ / W / saddles
> HI"
A 1"
«f / / i i i 1 i i i i 1 t l l I l l t I
I0 a JO 1 \O 2
Calculated holdup, %
Fig, 16, Comparison of the liquid holdup of Raschig ring and Berl saddle packings with the
values calculated using the equation of Bemer and Kalis [245]

For all types of packings Billet proposed the equation

Fr (75)
4L - L