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The effects of drag reduction by ribbons attached to cylindrical pipes

✍ Scribed by S.H Kwon; J.W Cho; J.S Park; H.S Choi

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
562 KB
Volume
29
Category
Article
ISSN
0029-8018

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✦ Synopsis

This study proposes a drag reduction device that uses three ribbons attached 120 degree apart to vertical pipes. Experiments were conducted in a circulating water channel to investigate the effects of the ribbon length and the direction of the flow on various current velocities. Drag on a vertical cylinder was measured by a resistance dynamometer. Flow visualizations were conducted using laser sheet beams. Laser Doppler Velocimetry (LDV) was used to measure the velocity field in the wake. This experiment demonstrates that attached ribbons can be used to reduce the drag force on vertical pipes for various directions of incoming flows. The ribbontype device is very simple and easy to fabricate for field applications. The results are promising for the application to offshore structures.

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