Articles | Volume 23, issue 2
Nonlin. Processes Geophys., 23, 83–89, 2016

Special issue: Complex environmental and geophysical turbulence

Nonlin. Processes Geophys., 23, 83–89, 2016

Research article 04 Apr 2016

Research article | 04 Apr 2016

Dual-plane PIV investigation of acoustically excited jets in a swirl nozzle

Gavita S. Regunath et al.

Related subject area

Subject: Nonlinear Waves, Pattern Formation, Turbulence | Topic: Climate, atmosphere, ocean, hydrology, cryosphere, biosphere
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Cited articles

André, J. C. and Lesieur, M.: Influence of helicity on the evolution of isotropic turbulence at high Reynolds number, J. Fluid Mech., 81, 187–207, 1977.
Crow, S. C. and Champagne, F. H.: Orderly structure in jet turbulence, J. Fluid Mech., 48, 547–591, 1971.
Drobniak, S. and Klajny, R.: Coherent structures of free acoustically stimulated jet, J. Turbulence, 3, 1, 2002.
Hassell, D. G. and Zimmerman, W. B.: Investigation of the convective motion through a staggered herringbone micromixer at low Reynolds number flow, Chem. Eng. Sci., 61, 2977–2985, 2006.
Khomenko, G. A. and Zimmerman, W. B.: Large scale structure evolution and mixing due to small scale helical forcing in a compressible viscous fluid, in: Mixing in Geophysical Flows, edited by: Redondo, J. and Metais, O., UPC Barcelona Press, Barcelona, 233–248, 1994.
Short summary
Helical structures are commonplace in geophysical flows, but their effect on turbulence is still enigmatic. A novel PIV laser technique has been used to analyze helical structures in a turbulent swirling jet where the underlying shear flow is subjected to external acoustic forcing. Although the acoustic excitation had an effect on the flow field, no evidence for the existence of large-scale helical structures with maximal helicity was found.