The oscillatory forces on a semi-submerged circular cylinder in water and in dilute aqueous solution of poly (ethylene oxide).
Authors
Genstil, Stephen Michael
Subjects
circular cylinder
Strouhal number
polyox
surface-piercing struts
drag reduction
Strouhal number
polyox
surface-piercing struts
drag reduction
Advisors
Sanders, James V.
Date of Issue
1969-06
Date
June 1969
Publisher
Language
en_US
Abstract
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 a small circular towing-tank and the
hydrodynamic forces sensed by a strain gauge and analyzed for the
time-dependent frequency spectra. The towing speeds ranged from
59 cm/sec to 253 cm/sec corresponding to Reynolds Numbers from
4 5
2x10 to 1x10 . The Strouhal Numbers based on the dominant
frequency of the oscillatory lift were between 0.17 and 0.21 and
are in agreement with the existing data for a completely submerged
circular cylinder. These frequencies were not influenced by either
the air-water interface or the addition of drag reducing polymers.
Also independent of the polymer concentration was the amplitude
of the life force. Attempts to interpret the oscillatory drag
component proved inconclusive.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
62 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This 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.