„Supercavitation“ A new Aeration Technology Prof. Dr.-Ing. Schmid A. 8 th International Symposium on Cavitation - CAV2012 Singapore
Cavitation induced by hydrodynamic processes Flow direction Pressure distribution inside a cavitation-nozzle
Cavitation induction inside a nozzle Low energy inputHigh energy input
Characteristics of cavitation nozzle
Demonstration of „Supercavitation“
„Supercavitation“-bubble development Source: University of Minnesota – Twin Cities - US St. Anthony Falls Laboratory -
„Supercavitation“ - sheath
Aerator principle
Mechanical Aerator – Cav-Jet
Experimental setup at WWTP Regnitzlosau
Operational data from WWTP Regnitzlosau Pure oxygen consumption [m^3/d] Electricity consumption [kWh/d] Continuous Testing Test start
Oxygen consumption [m^3/d] Test phase of Cav-Jet Icing problems Operational data from WWTP Regnitzlosau
Two-film theory of oxygen transfer – diffusion controlled
Water associates at low temperature
Supercavitation by tangential flow
Thank you very much for your attention Literature Schmid A.: New Jet-Aeration System using "Supercavitation" Environmental Science & Pollution Research, 17, 3, , Schmid A., Geier W.: Vorrichtung und Verfahren zum Einbringen von gasförmigem und/oder flüssigem Medium in Flüssigmedium. Deutsche Patentschrift DE , Schmid A.: Vorrichtung und Verfahren zum Einbringen von gasförmigem und/oder flüssigem Medium in Flüssigmedium. Deutsche Patentschrift DE , 2004.
Flow characteristics