Tuff,
Let me get this straight. You think you're vaporizing a portion of the water with your nozzle? Are you serious? How is this possible? You are somehow maintaining an air pocket in the block?
You can't convert water from liquid to gas when you have a closed pocket completely filled with liquid water.
Even if you could, the only way you'd see a benefit is to allow the water to leave the block in a vaporized state. Otherwise the heat of vaporization is completely contained within the block and of no net benefit. (Liquid in, liquid out = no good, liquid in, gas out = heat carried away in form of heat of vaporization)
Only a few things really matter here. One is the pressure available as a nozzle converts pressure into velocity. Two is the nozzle shape as rapid diameter changes convert pressure to velocity inefficiently. Three is the pattern formed on the baseplate by the nozzle.
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