Page 165 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

160

Table 1. Geometrical characteristics of some random packings after Billet [177]
Packing Material Size d p N a e c p
mm 1/m 3 rtfW nrVm 3
Intalox saddle Plastic 50 9422 133.0 0.900 0.758
35 25867 169.0 0.910
Intalox saddle Ceramic 50 114.6 0.761 0.747
Malax saddle; grid Plastic 50 12429 108.0 0.950
Telerete Plastic 25 37037 190.0 0.930 0.538
Hackete Plastic 45 12000 139.5 0.928 0.399
Sphere Glass 25 66664 134.5 0.430
13 561877 282.2 0.400
Berl saddle Ceramic 38 24928 164.0 0.700
25 80080 260.0 0.680
13 691505 546.0 0.650
Top-pak Alum. 50 106.6 0.956 0.604

Abbrev.: hydr.=hydrofllized

3
dp is the nominal size of the packing, N- number of packing elements in 1 m 5 a-
3
2
3
3
specifie surface area in m /m , and e -void fraction in m /m .
The data in Table 1 are taken from 4 tables given by Billet [177]. Small
differences in some of the values are observed in them, but since they are in the
range of the differences from experiment repetition, including re-dumping of
the packing, they are not discussed later.
By simple stereometrieal examination of geometrically similar
packings, it is easy to obtain the following expressions, independent of their
type:

e -const., (3)

d nM = const., (4)

3
N.d p - const., (5)