caa a22 4500 60619696X CHVBK 20210128100927.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00348-014-1872-8 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1872-8 PIV investigations on optical magnification and small scales in the near-field of an orifice jet [Elektronische Daten] [G. Lacagnina, G. Romano] 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. Springer-Verlag Berlin Heidelberg, 2014 Lacagnina G. CNR-INSEAN, the Italian National Research Council, Via di Vallerano 139, 00128, Rome, Italy aut Romano G. Department of Mechanical and Aerospace Engineering, SAPIENZA University of Rome, Via Eudossiana 18, 00184, Roma, Italy aut Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-11 0723-4864 56:1<1 2015 56 348 https://doi.org/10.1007/s00348-014-1872-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1872-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lacagnina G. CNR-INSEAN, the Italian National Research Council, Via di Vallerano 139, 00128, Rome, Italy aut NATIONALLICENCE 700 1- Romano G. Department of Mechanical and Aerospace Engineering, SAPIENZA University of Rome, Via Eudossiana 18, 00184, Roma, Italy aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-11 0723-4864 56:1<1 2015 56 348