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Onset of wave drag due to capillary-gravity surface waves

Steinberg, V (Weizmann Institute )
Tuesday 09 August 2005, 09:00-10:00

Seminar Room 1, Newton Institute


Phase diagrams of the flow states in Couette-Taylor flow of dilute polymer solutions as a function of three controlled parameters, namely the Reynolds number, the elasticity parameter, and the reduced polymer contribution to viscosity, that is proportional to the polymer concentration, are studied in detail. Flow visualization reveals that the Couette flow becomes unstable simultaneously either to one, two or three flow patterns depending on the location in the control parameter space. We investigate the character of flow motion in different patterns and the mechanism and type of transitions between different patterns using laser Doppler velocimetry.


[ppt ]


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