Abstract
The effects of different tracer particles used in the PTV technique on the velocity field are investigated. The measurements are taken in a water round jet at a Reynolds number equal to about 40000, a flow field widely examined in the literature, in which strong velocity differences are encountered. The interest is focused onto particles with different density. Although the mean and rms values are almost unaffected, both measurements obtained with light and heavy particles (in comparison to the density of the fluid) reveal a modified velocity field. The moments of velocity differences (structure functions) point out that such a modification is felt within each range of flow scales. Particles with density almost equal to that of the fluid reproduce the flow behaviour over all the scales.
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References
Antonia, R. A., Satyaprakash, B. R. and Hussain, A. K. M. F., Measurement of dissipation rate and some other characteristics of a turbulent plane and circular jets, Phys Fluids, 23 (1980), 695–699.
Antonia, R. A., Zhou, T. and Romano, G. P., Second- and third-order longitudinal structure function in a fully developed turbulent channel flow, Phys Fluids, 9–11 (1997), 3465–3471.
Antonia, R. A., Zhou, T. and Zhu, Y., Three-component vorticity measurements in a turbulent grid flow, J Fluid Mech, 374 (1998), 29–57.
Corrsin, S. and Lumley, J., Appl Sci Research, 6A (1956), 114–123.
Elgobashi, S. and Truesdell, G.C., Direct simulation of particle dispersion in a decaying isotropic turbulence, J Fluid Mech, 242 (1992),655–7000.
Elgobashi, S., On predicting particle-laden turbolent flows, App Sci Research, 52 (1994), 309–329.
Frisch, U., Turbulence: the legacy of A.N. Kolmogorov, (1995), Cambridge University Press.
Maxey, M. and Riley, R., Equation of motion for a small rigid sphere in a nonuniform flow, Phys Fluids, 26 (1983), 883–889.
Merzkirch, W., Flow Visualizations, (1987), Academic Press.
Miozzi, M., Querzoli, G. and Romano, G. P., The investigation of an unstable convective flow using optical methods, Phys Fluids, 10–11 (1998), 2995–3008.
PIV 95, Proceedings of the First International Workshop on PIV, (1995), Fukui (Japan).
PIV 97, Proceedings of the Second International Workshop on PIV, (1997), Fukui (Japan).
Romano, G. P., Investigation on particle trajectories and lagrangian statistics at the outlet of a circular jet, Exp Thermal Fluid Science, 17 (1998), 116–123.
Romano, G. P., Turano, E. and Antonia, R. A., The measurement of longitudinal and transverse structure functions in a turbulent round jet, Proceedings of the First International Symposium on Turbulence and Shear Flow Phenomena, (1999), Santa Barbara (USA).
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Giovanni P. Romano: He received his degree in Physics in 1984 from University “La Sapienza” in Roma. He worked at the Italian Towing Tank Institute (INSEAN) on Naval Hydrodynamics from 1985 to 1989. Since 1989 is at the Department of Mechanics and Aeronautics of the University “La Sapienza” in Roma as Research Scientist (teaching Numerical Fluid Mechanics) and from 1998 as Professor of Experimental Aerodynamics. He is involved in research project for the investigation of large and small-scale structures in turbulent flows as jets, boundary layers, channel flows and wakes using optical techniques as LDA, LIF, PTV and PIV. He published more than 20 papers in International Journals.
Stefano Zincone: He got his degree in Aeronautical Engineering in December 1998 and at present collaborates with the Department of Mechanics and Aeronautics.
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Romano, G.P., Zincone, S. Velocity measurements in a turbulent round jet using PTV: the effect of tracer particles. J Vis 3, 175–185 (2000). https://doi.org/10.1007/BF03182410
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DOI: https://doi.org/10.1007/BF03182410