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Originally Posted by Groth
Well, if you get swirling really fast, centrifugal force opens up a partial vacuum in the center, which means more of your water molecules are closer to the metal, plus a small amount phase change fun. Of course you still have the overall goodness of higher pressure and higher velocity at your boundary layer.
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No vacuums - we don't want the water to cavitate leaving dry spots on the metal - besides - the pumping power required to effectuate a phase-change on water in these conditions is significantly greater than what hobbyist pumps can achieve.