The effect of dilute polymer solution on the Strouhal frequency of circular cylinders.
Kell, Richard Edward
MetadataShow full item record
Flow of aqueous solutions of Polyox WSR-301, at a concentration of 25 wppm, was investigated in the cylinder drag transition region of Reynolds numbers. Frequency spectrum and drag force were measured on a circular cylinder (diameter 1 inch). Frequency spectrum, Strouhal frequency and drag force also were measured on circular cylinders in water (diameter 1 and 1-1/2 inch). The polymer additive did not alter the vortex shedding frequency from that of water at the same Reynolds numbers. As the polymer degrades, a state is reached where concentration, Reynolds number and body size combination become such that the transition occurs in the boundary layer. Transition in the polymer solution occurred earlier than that in the pure solvent. At one Reynolds number, several regimes of flow may be observed as the polymer solution degrades.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
The oscillatory forces on a semi-submerged circular cylinder in water and in dilute aqueous solution of poly (ethylene oxide). Genstil, Stephen Michael (1969-06);The oscillatory forces on towed semi -submerged rigid circular cylinders were measured in water and in 100 and 200 ppm aqueous solutions of Polyox WSR301 . Cylinders of half-, one-, and two-inch diameters were towed in ...
Fitts, Joel Rea (Monterey, California; Naval Postgraduate School, 1972-06);This study was a continuation of previous investigations of the flow of dilute (25 WPPM) polymer (Polyox WSR-301) solutions about bluff bodies in the drag transition flow regime. Detailed measurements of turbulence ...
Naval Postgraduate School Physics (2015);How Do Speakers Work? Hello. I’m Dr. Bruce Denardo here in the Physics Department of the Naval Postgraduate School in Monterey, California. The purpose of a loudspeaker is to convert electrical energy into acoustic energy. ...