Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16251
Title: Effect of phase difference on the interaction of hairpin vortices induced by in-line twin synthetic jets
Authors: Wen, X
Tang, H 
Keywords: Dye visualization
Hairpin vortices
In-line twin synthetic jets
Particle image velocimetry
Phase difference
Issue Date: 2015
Publisher: Springer Verlag
Source: Journal of visualization, 2015 How to cite?
Journal: Journal of Visualization 
Abstract: Abstract: An experimental study is carried out to investigate the effect of operational phase difference of in-line twin synthetic jet actuators (SJAs) on the interaction of synthetic jet-induced hairpin vortices. The resulting vortex structures at four phase differences, i.e., Δϕ = 0°, 90°, 180°, and 270°, are presented and compared using both stereo dye visualization and particle image velocimetry (PIV) measurements. Three types of vortex structures are observed: one combined vortex at Δϕ = 90°, two completely separated hairpin vortices at Δϕ = 270°, and partially interacting vortex structures at Δϕ = 0° and 180°. The combined vortex is the strongest and most penetrates into the boundary layer. The completely separated hairpin vortices are the closest to the wall and hence are able to exert the most influence in the near-wall region. As for the partially interacting vortex structures, the head of one hairpin vortex interacts with legs of the other, producing complex vortex structures. Through this study it is also found that hairpin vortices issued from the upstream SJA are able to maintain their coherence more easily than their counterparts issued from the downstream SJA, regardless the phase difference. The secondary vortices captured by the PIV measurements are also compared.
URI: http://hdl.handle.net/10397/16251
ISSN: 1343-8875
DOI: 10.1007/s12650-015-0291-0
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

2
Last Week
0
Last month
0
Citations as of Oct 10, 2017

WEB OF SCIENCETM
Citations

1
Last Week
0
Last month
0
Citations as of Oct 16, 2017

Page view(s)

32
Last Week
1
Last month
Checked on Oct 16, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.