As the gas is sucked into the vacuum of pressure differential, it is torn into smaller gas "apherons", their size are determined namely by the volume of gas being fed into the venturi through a small orifice and then the flow rips it further and prevents coalescing.
Think about tube of toothpaste and you cutting off pieces of the paste at a fast or slow rate.
The faster the rate it comes out, the larger the pieces.
The faster you cut, the smaller the pieces.
The slower the rate the gas comes out, the better the chopping the venturi effect will have.
Unlike the disc and other means to diffuse gas, this has positive pressure.
Addign gas to the suction side of a pump will also chop the larger bubbles veryb effectively, see the needle wheel skimmer from RedSea, they sell the pump and impeller as well, 15$ for the impeller, 70$ or something to powerhead.impeller together.
I'd like to see if I cannot use the impeller in other brands of power head.
That would chop the gas up well, then, recirculate it through a venturi.
An in line design can be done effectively.
I think I already have a veryu effective sump and in line Reactor design, but I'd like to focus on a venturi design that does not use a reactor tube at all.