Characteristics Of Turbulent Round Jets In Its Potential-Core Region

• Main Authors: S. Sivakumar, Ravikiran Sangras, Vasudevan Raghavan
• Format: Text
• Language: English
• Published: Zenodo 2012
• Subjects: Contoured nozzle; hot-wire anemometer; Reynolds number; velocity fluctuations; velocity spectra.; Fiedler; Nozzle; Pollard; Rouse; The Nozzle; sami
• Online Access: https://dx.doi.org/10.5281/zenodo.1055134; https://zenodo.org/record/1055134

In this work, stationary hot-wire measurements are carried out to investigate the characteristics of a round free jet in its potential core region (0 ≤ x/d ≤ 10). Measurements are carried out on an incompressible round jet for a range of Reynolds numbers from 4000 to 8000, calculated based on the jet exit mean velocity and the nozzle diameter. The effect of flow velocity on the development characteristics of the jet in the core region is analyzed. Timeaveraged statistics, spectra of velocity and its higher order moments are presented and explained. : {"references": ["S. Sami, T. Carmody, and H. Rouse, \"Jet diffusion in the region of flow\nestablishment,\" Journal of Fluid Mechanics, vol. 27, pp. 231-252,\n1967.", "I. Wygnanski and H. Fiedler, \"Some measurements in the selfpreserving\njet,\" Journal of Fluid Mechanics, vol. 38, pp. 577-612,\n1969.", "P. N.R. and J. Lumley, \"Turbulence measurements in axisymmetric jets\nof air and helium. part 1. air jet,\" Journal of Fluid Mechanics, vol. 246,\npp. 197-223, 1993.", "L. Boguseawski and C. O. Popiel, \"Flow structure of the free round\nturbulent jet in the initial region,\" Journal of Fluid Mechanics, vol. 90,\npp. 531-539, 1979.", "A.-R. A.A., S. AI-Fahed, and W. Chakroun, \"The near-field\ncharacteristics of circular of jets at low reynolds numbers,\" Mechanics\nResearch Communications, vol. 23, pp. 313-324, 1996.", "F. H., C. Ball, and A. Pollard, \"Reynolds number effects within the\ndevelopment region of a turbulent round free jet,\" International Journal\nof Heat and Mass Transfer, vol. 52, pp. 3943-3954, 2009.", "G. Xu and R. Antonia, \"Effect of different initial conditions on a\nturbulent round free jet,\" Experiments in Fluids, vol. 33, pp. 677-683,\n2002.", "Q. W.R., \"Upstream nozzle shaping effects on near field flow in round\nturbulent free jets,\" European Journal of Mechanics B/Fluids, vol. 25,\npp. 279-301, 2006.", "J. Mi and G. Nathan, \"Statistical properties of turbulent free jets issuing\nfrom nine differently-shaped nozzles,\" Flow Turbulence Combustion,\nvol. 84, pp. 583-606, 2010.\n[10] T. Shakouchi, M. Kito, T. Sakamoto, K. Tsujimoto, and T. Ando, \"Flow\ncontrol of jet flow by passive nozzle configuration changes,\"\nInternational Journal of Flow Control, vol. 1, pp. 73-85, 2009.\n[11] S. Ashforth-Frost and K. Jambunathan, \"Effect of nozzle geometry and\nsemi-confinement on the potential core of a turbulent axisymmetric free\njet,\" Int. Comm. Heat Mass Transfer, vol. 23, pp. 155-162, 1996.\n[12] R. H.R. and T. Wong, \"Velocity field characteristics of turbulent jets\nfrom round tubes with coil inserts,\" Applied Thermal Engineering, vol.\n22, pp. 1037-1045, 2002.\n[13] P. Burattini, R. Antonia, S. Rajagopalan, and M. Stephens, \"Effect of\ninitial conditions on the near-field development of a round jet,\"\nExperiments in Fluids, vol. 37, pp. 56-64, 2004.\n[14] P. Burattini and L. Djenidi, \"Velocity and passive scalar characteristics\nin a round jet with grids at the nozzle exit,\" Flow, Turbulence and\nCombustion, vol. 72, pp. 199-218, 2004.\n[15] P. Suresh, K. Srinivasan, T. Sundararajan, and S. K. Das, \"Reynolds\nnumber dependence of plane jet development in the transitional\nregime,\" Physics of Fluids, vol. 20, p. 044105, 2008.\n[16] C. Olinto and S. M\u00f6ller, \"X-probe calibration using collis and william-s\nequation,\" in 10o Brazilian Congress of Thermal Sciences and\nEngineering, 2004.\n[17] H. Mouri, M. Takaoka, A. Hori, and Y. Kawashima, \"Probability\ndensity function of turbulent velocity fluctuations,\" Phys. Rev. E, vol.\n65, p. 056304, 2002.\n[18] Stephen B. Pope, Turbulent Flows, New York: Cambridge University\nPress, 2000, ch. 6."]}