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Effects of viscoelasticity on cavitation in drag reducing fluidsTo study cavitation inception in polymer solutions, a blow-down water tunnel with short running times was used. Tests were made using 1/4 and 1/2 inch diameter models of hemispherical-nose cylinders. To accurately detect the inception of cavitation, a reliable technique was developed using a continuously operating He-Ne gas laser. The laser beam was adjusted to grazing incidence with the model at the minimum pressure point where cavitation inception was to be expected. A sensitive photocell was placed at ninety degrees to detect the beam. As incipient cavitation occurred, the bubbles caused scattering of the laser beam which was picked up by the photocell. Static pressure near the model in the working section of the tunnel was measured using a solid-state pressure pick-up. The signals from the photocell and the pressure pick-up were recorded on an oscillograph. Velocity field visualization was achieved using one microsecond duration light pulses scattered by small polystryrene latex spheres in the flow.
Document ID
19740018698
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Ting, R. Y.
(Naval Research Lab. Washington, DC, United States)
Date Acquired
August 7, 2013
Publication Date
April 1, 1974
Publication Information
Publication: NBS The Role of Cavitation in Mech. Failures
Subject Category
Fluid Mechanics
Accession Number
74N26811
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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