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The CO2 in the liquid (beer) comes out of solution and carries some fluid up the tube with it. Which makes this a simple air lift pump using CO2 however both Victor Schauberger and Tesla proposed such devices which use naturally occurring dissolved gasses in an open cycle. Now if we had a solution which could absorb a gas then release it through a small variation of some property then we might have something.
It is also interesting to note that the low pressure side (foamy) draws liquid in and in the same instant the lower pressure also releases the dissolved CO2 which makes it self-sustaining until all the dissolved CO2 is gone.
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