From what I can tell, its a cavitating bubble in a very fast flowing tube. Then water vapor is extracted from inside the bubble (not sure how). Given the energy

From what I can tell, its a cavitating bubble in a very fast flowing tube. Then water vapor is extracted from inside the bubble (not sure how). Given the energy required to keep the flow going, and the drip of clean water that would result it should be easily calculable what the energy input/volume of water is.