Abstract
This chapter describes the results of an investigation of the near-field spatio-temporal evolution of a zero-net-mass-flux (ZNMF) jet at Re = 13,329 and a St = 0.03. This ZNMF jet has been found to be a turbulent jet in the far field (da C Andrade in On the circulations caused by the vibration of air in a tube, pp. 445–470, 1931 [6]). The experimental investigation used state-of-the art time resolved high spatial resolution 2-component 2-dimensional (2C-2D) particle image velocimetry (PIV). Advanced multigrid cross-correlation digital PIV (MCCDPIV ) analysis has been employed to yield high spatial resolution with improved velocity uncertainty PIV measurements (Soria in Multigrid approach to cross-correlation digital PIV and HPIV analysis. World Scientific Publication, Hackensack, pp. 309–347, 2006 [25]). The measured time series of the (x, r) in-plane velocity fields and the azimuthal out-of-plane vorticity fields have been used to investigate the temporal spectra in the jet shear layer of this ZNMF jet. Triple decomposition has been employed to investigate the axial and radial distributions of the mean, phase correlated and turbulence intensities and Reynolds stress. The topology of the near field of this ZNMF jet and its phase evolution have been investigated via the streamline pattern of the phase-average velocity fields and the phase correlated azimuthal vorticity.
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Acknowledgments
The support of this research by the Australian Research Council through facilities provided by an ARC LIEF grant are gratefully acknowledged. The MCCDPIV analysis was carried out on the NCI MASSIVE high performance computer, use of the NCI infrastructure for this purpose is gratefully acknowledged. The author is also very grateful to and would also like to acknowledge his colleagues Drs Nicholas Buchmann, Omid Amili and H.M Cui from LTRAC, who undertook the ZNMF jet experiments.
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Soria, J. (2015). Experimental Studies of the Near-Field Spatio-Temporal Evolution of Zero-Net-Mass-Flux (ZNMF) Jets. In: New, D., Yu, S. (eds) Vortex Rings and Jets. Fluid Mechanics and Its Applications, vol 111. Springer, Singapore. https://doi.org/10.1007/978-981-287-396-5_3
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DOI: https://doi.org/10.1007/978-981-287-396-5_3
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