I don't see how vaporizing water is part of anything here but...
There is a small flare specified at the nozzle outlet. It's purpose is to keep the flow as close to straight as possible.
"Spraying" is not desired here: the purpose of a nozzle is for jet inpingement, which directs a high-speed flow towards the baseplate, creating a highly localized turbulent area, which in turn improves the cooling (aka it reduces the thermal resistance from the block to the fluid).
The reason to use a nozzle is to take maximum cooling advantage of the power provided by a pump, rather than using a much larger pump, in (what I'll call) a raw high flow design.
We've come a long way, since the original Maze 1 design. "Spraying" or spreading the flow doesn't really serve any efficient purpose, in many cases.
Now if you were talking about a phase change system, that a whole other ball game.
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