Abstract
Two dimensional imaging by a Mie scattering technique is used to examine a complex three dimensional mixture field. The flow is generated by a mechanically rotated inclined jet, which is a well defined member of the family of precessing jet flows. This preliminary study of the effects of velocity (Reynolds number) and precession frequency (Strouhal number) on global characteristics of the mixing field, using phase conditional averaging of the concentration field. Instantaneous images show large structures of the order of the exit diameter to develop close to the jet exit. An underlying organisation of structures which are an order of magnitude larger than the exit diameter is also apparent. The phase averaged mixture field also shows the underlying organisation in the flow indicating consistent generation of these structures. The investigation shows that the position of the underlying structures and the development of the large scale turbulence are functions of the initial conditions.
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© 1999 Springer Science+Business Media Dordrecht
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Nobes, D.S., Newbold, G.J.R., Alwahabi, Z.T. (1999). Quantitative Planar Imaging of Large Structures Developed Through the Precession of a Jet. In: Sørensen, J.N., Hopfinger, E.J., Aubry, N. (eds) IUTAM Symposium on Simulation and Identification of Organized Structures in Flows. Fluid Mechanics and Its Applications, vol 52. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4601-2_26
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DOI: https://doi.org/10.1007/978-94-011-4601-2_26
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