TITLE

Vortex shedding control on a bare cylinder using hexagonal perforated outer cylinder

AUTHOR(S)
Akar, Mustafa Atakan; Kucuk, Mehmet
PUB. DATE
January 2017
SOURCE
Canadian Journal of Physics;Jan2017, Vol. 95 Issue 1, p69
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The aim of the study is to observe the effect of outer hexagonal perforated cylinder surrounding an inner cylinder on vortex structure behind bluff body. Vortex shedding characteristics from bluff body are experimentally studied by particle image velocimetry (PIV) in deep water. The inner cylinder had seven different diameters ( Di), varied from 30 to 90 mm with an increment of 10 mm and the hexagonally perforated outer cylinder placed outside of the inner cylinder was used as a control element. Experiments were carried out with six perforated cylinders with a diameters of 100 mm ( Do) and six porosities, β, with hole diameter 10 mm. The porosity, β, and diameter ratio, Di/ Do, had substantial effect on the flow characteristics behind the cylinder. For the range of diameter ratios of 0.3 ≤ Di/ Do ≤ 0.5 the optimum porosity that controls the flow structure is found to be β = 0.6. For 0.6 ≤ Di/ Do ≤ 0.7 it is β = 0.5 and β = 0.4 for 0.8 ≤ Di/ Do ≤ 0.9. With increasing diameter ratio, Di/ Do, peak magnitude locations of Reynolds shear stress, , and turbulence kinetic energy approach the inner outer cylinder system slightly. For all diameter ratios, β = 0.6 is the most effective porosity ratio.
ACCESSION #
120530336

 

Share

Read the Article

Courtesy of MICHIGAN ELIBRARY

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics