Page 258 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

248

Based on own data obtained in a 100 mm diameter column filled up
with 10 mm glass Raschig rings using glyeerol-water mixtures with viscosity
from 0.9 to 26 cP, and literature data, they obtained the equation:

k La _
= 3.9x10-

(154)
, \U.3J , N 1.67

{MWR)

where

= 0.484(MWR) ,0.108 (155)

and

MWR = 1.12 (156)

00 is the contact angle of wettability, deg.
These equations are valid when the packing is not fully wetted.
For calculation of the volumetric mass transfer coefficient Billet [177]
proposed the equation;

2/3
L (157)

valid for dififerent types of random and arranged packings. The experimental
constant C L for different types and dimensions of random packings is presented
in Table 11.