hot water spray mist
I've also seen that, one of the overspray systems uses the same technique to achive extremely fine spray mist, as the hot water flash boils as the pressure drops as it exits the spray nozzle. As I recall at the point about 20% of the spray mass flow evaporates it completely negates the pre-heating of the liquid, (ie the mist dropplets have cooled to ambient temp).
Larry
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