Abstract
Three-dimensional (3D) flow structures of a turbulent jet issuing from a sharp-edged circular nozzle having multiple triangular tabs are experimentally studied by employing a stereoscopic-PIV (SPIV) system. Two different sharp-edged jet nozzles having 4 and 8 tabs are investigated at a jet Reynolds number of Re = 10,000. The SPIV measurements are carried out at 5 different cross-sectional planes along the jet direction. Spatial distributions of turbulent statistics including mean velocity, mean vorticity, and turbulent kinetic energy are obtained at each cross-sectional plane. The jet entrainment rate showing the mixing of the jet and ambient fluids is also estimated using the measured 3D velocity field information. As a result, the jet issuing from the nozzle with 4 tabs shows better turbulent mixing effect at further downstream position than the 8 tabs case because of the reduced reciprocal interactions of the streamwise vortices that promote the turbulent dissipation.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
L. Bradury and A. Khadem, The distortion of a jet by tabs, Journal of Fluid Mechanics, 70 (1975) 801–815.
K. Zaman, M. Reeder and M. Samimy, Control of an axisymmetric jet using vortex generators, Physics of Fluids, 6 (1994) 778–793.
M. Reeder and M. Samimy, The evolution of a jet with vortex generating tabs: real-time flow visualizations and quantitative measurements, Journal of Fluid Mechanics, 311 (1996) 73–118.
K. Zaman and J. Foss, The effect of vortex generators on a jet in a cross-flow, Physics of Fluids, 9 (1997) 106–114.
K. Zaman, Reduction of jet penetration in a cross-flow by using tabs, Proc. of 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference (1998) Paper No. 98-3276.
J. Foss and K. Zaman, Large- and small-scale vertical motions in a shear layer perturbed by tabs, Journal of Fluid Mechanics, 382 (1999) 307–329.
D. G. Bohl and J. F. Foss, Near exit plane effects caused by primary and primary-plus-secondary tabs, AIAA Journal, 37(2) (1999) 192–201.
J. Mi and G. J. Nathan, Effect of small vortex-generators on scalar mixing in the developing region of a turbulent jet, International Journal of Heat and Mass Transfer, 42 (1999) 3919–3926.
H. Hui, T. Kobayasi, T. Saga, N. Taniguchi and S. Segawa, Investigation of the tabbed jet mixing flows by using LIF and PIV, Proc. of 8th International Symposium on Flow Visualization (1998) 4.1–4.11.
N. Gao, H. Sun, and D. Ewing, Heat transfer to impinging round jets with triangular tabs, International Journal of Heat and Mass Transfer, 46 (2003) 2557–2569.
J. H. Yoon and S. J. Lee, Direct comparison of 2-D and 3-D stereoscopic PIV measurements, Measurement Science and Technology, 13(10) (2002) 2027–2036.
J. H. Yoon and S. J. Lee, Investigation of near-field structure of an elliptic jet using a stereoscopic PIV, Measurement Science and Technology, 14(12) (2003) 2034–2046.
Author information
Authors and Affiliations
Corresponding author
Additional information
Recommended by Associate Editor Simon Song
Sang-Joon Lee received his Master and Ph.D. degrees in Mechanical Engineering from KAIST in 1982 and 1986. He is a professor in the Department of Mechanical Engineering at POSTECH since 1987. His research interests are quantitative flow visualization (PIV, Holography, X-ray imaging), experimental fluid mechanics, bluff body aerodynamics, microfluidics, and bio-fluid flows.
Young-Gil Jang received his B.Sc. and M.Sc degree in Mechanical Engineering from POSTECH in 2002 and 2004. He was a graduate student of BBRC (Biofluid and Biomimetics Research Center) since 2002. His research fields were drag reduction and Stereoscopic PIV technique. He passed away due to cancer in April 2009.
Yong-Seok Choi received his B.Sc. and Ph.D. degrees in Mechanical Engineering from POTECH in 2005 and 2011. He currently works for BBRC (Biofluid and Biomimetics Research center) at POSTECH as a postdoc. His research interests are 3D flow field measurement using a digital holographic-PTV technique.
Rights and permissions
About this article
Cite this article
Lee, SJ., Jang, YG. & Choi, YS. Stereoscopic-PIV measurement of turbulent jets issuing from a sharp-edged circular nozzle with multiple triangular tabs. J Mech Sci Technol 26, 2765–2771 (2012). https://doi.org/10.1007/s12206-012-0725-8
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12206-012-0725-8