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Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural >
No.26 (1978/09) >

 
Title :Periodic Wake behind a Circular Cylinder
Authors :Arakaki, Giichi
Igei, Ryokan
Authors alternative :新垣, 義一
伊芸, 諒寛
Issue Date :Sep-1978
Abstract :The features of periodic wakes behind a circular cylinder in the range of 40 < R < 150, R being the Reynolds number based on the speed and diameter of the cylinder, are investigated in a water tank using flow-visualization techniques. The relationship between the Reynolds number (R) and wavelength in the waving-line wake or longitudinal spacing of vortices in the vortex-street (λ^<*>) is obtained as follows: λ^<*> = 3.25 + 220/R, 40 < R < 150. It is found, by examining the wake parameters which are derived from the presented empirical formula for λ^<*> (R) and the Roshko's formula for S (R), that the critical Reynolds number at which the vortex streets begin to form is about 64 and that the vortex streets do not develop in the range of the Reynolds number lower than this critical value.
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/23827
Citation :琉球大学理工学部紀要. 理学編 = Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences no.26 p.1 -8
Appears in Collections:No.26 (1978/09)

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