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Uploaded on Jan 12, 2010
The movie shows the new scientific setup of the Physics of Fluids group from the University of Twente, to research high turbulent two-phase flows (i.e. water with bubbles injected to flow) in light of skin drag reduction studies. More information about the setup can be found at: http://pof.tnw.utwente.nl/3_research/... In this movie the outer cylinder was kept stationary and the inner cylinder is sped up to its maximum angular rotation rate of 1200 RPM. For demonstration purposes the tank is not completely filled to the top, enabling the free water surface to draw in bubbles into the flow.