
51Hydrodynamics of Pneumatic Foam
Theequilibriumliquidfractionation enhances to 0.246 (i.e., 24.6%) and the
liquid ux removed from the system is 0.233 mm.s
−1
.
If all the foamate liquid were returned to the column (i.e., at a ux of 0.533
mm.s
−1
), then the net ux would be zero and the column would be said to
be operating at total reux, which is equivalent to incipient positive bias in
otation.
3.7 Hydrodynamic Modulation Due to
Bubble Disproportionation
As discussed in Section 3.1, the vertical foam misapprehension has it that the
liquid fraction of a vertical column of pneumatic foam diminishes with
height because foam at a higher lev ...