Experimental studies of the near-field spatio-temporal evolution of Zero-Net-Mass-Flux (ZNMF) jets

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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 phaseaverage velocity fields and the phase correlated azimuthal vorticity.
Original languageEnglish
Title of host publicationVortex Rings and Jets: Recent Developments in Near-Field Dynamics
EditorsDaniel TH New, Simon CM Yu
Place of PublicationSingapore
PublisherSpringer
Pages61 - 92
Number of pages32
ISBN (Print)9789812873958
DOIs
Publication statusPublished - 2015

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