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Experiments in Fluids

, 56:5 | Cite as

PIV investigations on optical magnification and small scales in the near-field of an orifice jet

  • G. Lacagnina
  • G. P. Romano
Research Article

Abstract

Among turbulent jets, the orifice jet is still far from being fully understood especially due to the phenomenon of “vena contracta”, which takes place in the near field. In this work, the attention is focused to large-scale statistics (mean field and higher statistical moments of the velocity) and to small-scale statistics (velocity derivative statistical moments) of such a jet, with a special focus onto the effect of optical magnification on particle image velocimetry measurements. In order to investigate this effect on the measurements, framed areas of different size have been considered by changing the magnification factor through the object plane distance. The obtained results show that a limit on the choice of this parameter exists for a proper description of both small and large scales.

Keywords

Particle Image Velocimetry Particle Image Velocimetry Technique Optical Magnification Vena Contracta Turbulent Kinetic Energy Dissipation Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.CNR-INSEAN, the Italian National Research CouncilRomeItaly
  2. 2.Department of Mechanical and Aerospace EngineeringSAPIENZA University of RomeRomaItaly

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