Lynton,
I don't think the micro bubbles accumulate like that.
There is a saturation point... just as there is for DO. From what I have
read, there is no evidence to support an endless accumulation of microbubbles
and therefore an overflow situation. Micro bubbles can stay in suspension
in water for a long time, but there is a physical limit that is governed by
water temperature, what is dissolved or suspended in the water, atmospheric
pressure, the size of the bubbles, and how many bubbles are present.
They stay in suspension because there isn't enough force from the water around
the bubbles to cause them to combine or rise out of the solution. Why they
stay in suspension has to do with water tension that allows them to be
suspended. As they reach a saturation point, which is determined by the
water tension needed to retain them, they will come out of suspension because
there isn't enough water tension to allow them to stay in suspension.
There's a very similar thing that limits the amount of DO from the atmosphere
that can physically be present in water. Many of the same kind of
variables apply... water temperature, what is dissolved or suspended in the
water, atmospheric pressure, and the amount already in the water.
--Thomas Giannou
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