Thinking about thinking here, just how would the vacuum be introduced?
Somewhere above the water, in which case the vacuum pump would suck out all the gases, or should the water itself be subject to some cylinder where you pull out the piston to create vacuum in the whole WFC.......? If so, in what way could the produced gases be released in order to maintain the vacuum?
Perhaps best to use a vacuum pump for the gases and let the output from the vacuum pump feed some bubbler prior to having it enter say a carburator, if you felt like experimenting with the explosiveness of the gases at the same time that is.
Discuss.

Last I heard of this guy, he was belting across Australia in a 4WD powered by a mixture of waste oil and water. Pity he chickened out on the bike project.

ps we don't really water water flow on a myers cell , but on other ones yes,
so if cavitation  it is on a still wfc not moving water etc  or  we risk mess up capacitiance wfc etc