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Stereoscopic-PIV measurement of turbulent jets issuing from a sharp-edged circular nozzle with multiple triangular tabs

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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.

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Authors and Affiliations

  1. Center for Biofluid and Biomimic Research, Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Sang-Joon Lee, Young-Gil Jang & Yong-Seok Choi

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  1. Sang-Joon Lee
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  2. Young-Gil Jang
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  3. Yong-Seok Choi
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Correspondence to Sang-Joon Lee.

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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.

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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

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  • DOI: https://doi.org/10.1007/s12206-012-0725-8

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