Foam appears at the top of the reactor when Ugas is larger than a
critical value for a fixed U liquid .
If you increase Ugas for a fixed U
push down the foam.
If you increase U liquid for a fixed U
gas, the foam
There is no foam when U liquid is large enough.
The interface moves down when the gas is increased and
moves up when the liquid is increased.
This is the way reactors foam; the bubbly mixture below
is consumed by foam.
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