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Directory:Cavitation

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Supercavitation for blinding underwater speeds (http://www.subsim.com/ssr/page33.html) - It's loud, it's rocket powered and it's fearsomely fast -- Mach plus. Duncan Graham-Rowe discusses the future of underwater travel. This supersonic sub concept arose from the cold war. (Subsim Review, citing New Scientist; July 22, 2000)

Cavitation Heaters - Cavitation heaters are claimed to heat fluids with greater efficiency than other methods. Some claim more energy output than input. The most common method used is to rotate a cylinder inside the fluid to produce bubbles, which generate heat as they collapse.

Ultrasonic Processing for Fast Biodiesel Production (http://www.greencarcongress.com/2007/02/researchers_use.html) - Ultrasonication produces biodiesel yields of 99% in five minutes instead of one hour, and reduces separation time from 5-10 hours to 15 minutes, according to Hielscher (http://www.hielscher.com/ultrasonics/biodiesel_transesterification_01.htm). It decreases the catalyst requirement by 60% due to cavitational bubble collapse, which produces intense local heating and high pressures. (Green Car Congress; Feb. 26, 2007)

DK Group (http://www.dkgroup.dk/) - The Air Cavity System improves the fuel efficiency of ships up to 15% by reducing the frictional resistance (http://www.hydrofoils.org/Acs/acs.html) of the hull surface. This is achieved by replacing the flat-bottom surface of the vessels hull with a specially designed Air Cavity System that minimizes the hull/water contact area.