
46 Foam Fractionation: Principles and Process Design
It should be noted that, when foam fractionators are run as enrichers, it
is usual to run with a very dry foam to promote enrichment, as will be dis-
cussed in Chapters 6 and 7. Certainly, a liquid fraction of 13.7%, as is devel-
oped in Figure3.4, would be considered very wet for an enricher, although
such liquid fractions may be seen in strippers.
0
0 1000800600400
r
b
(µm)
j
f
(mm/s)
200
0.1
0.3
0.2
04
0
0.04
0.08
FIGURE 3.6
The variation of liquid fraction and liquid ux according to the theory of Stevenson (2007b)
with bubble radius r
b
under the conditions of μ = 1.0 mPa.s, ρ
f
= 1,000 kg.m
−3
, and ...