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„Supercavitation“ A new Aeration Technology Prof. Dr.-Ing. Schmid A. 8 th International Symposium on Cavitation - CAV2012 Singapore.

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Präsentation zum Thema: "„Supercavitation“ A new Aeration Technology Prof. Dr.-Ing. Schmid A. 8 th International Symposium on Cavitation - CAV2012 Singapore."—  Präsentation transkript:

1 „Supercavitation“ A new Aeration Technology Prof. Dr.-Ing. Schmid A. 8 th International Symposium on Cavitation - CAV2012 Singapore

2 Cavitation induced by hydrodynamic processes Flow direction Pressure distribution inside a cavitation-nozzle

3 Cavitation induction inside a nozzle Low energy inputHigh energy input

4 Characteristics of cavitation nozzle

5 Demonstration of „Supercavitation“

6 „Supercavitation“-bubble development Source: University of Minnesota – Twin Cities - US St. Anthony Falls Laboratory -

7 „Supercavitation“ - sheath

8 Aerator principle

9 Mechanical Aerator – Cav-Jet

10 Experimental setup at WWTP Regnitzlosau

11 Operational data from WWTP Regnitzlosau Pure oxygen consumption [m^3/d] Electricity consumption [kWh/d] Continuous Testing Test start

12 Oxygen consumption [m^3/d] Test phase of Cav-Jet Icing problems Operational data from WWTP Regnitzlosau

13

14 Two-film theory of oxygen transfer – diffusion controlled

15 Water associates at low temperature

16 Supercavitation by tangential flow

17 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.

18 Flow characteristics


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