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Characteristics of Twin Jets in the Vicinity of a Free Surface

[+] Author Affiliations
M. S. Rahman, E. M. Nabess, M. F. Tachie

University of Manitoba, Winnipeg, MB, Canada

Paper No. FEDSM2016-7672, pp. V01BT24A002; 10 pages
doi:10.1115/FEDSM2016-7672
From:
  • ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1B, Symposia: Fluid Mechanics (Fundamental Issues and Perspectives; Industrial and Environmental Applications); Multiphase Flow and Systems (Multiscale Methods; Noninvasive Measurements; Numerical Methods; Heat Transfer; Performance); Transport Phenomena (Clean Energy; Mixing; Manufacturing and Materials Processing); Turbulent Flows — Issues and Perspectives; Algorithms and Applications for High Performance CFD Computation; Fluid Power; Fluid Dynamics of Wind Energy; Marine Hydrodynamics
  • Washington, DC, USA, July 10–14, 2016
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5029-9
  • Copyright © 2016 by ASME

abstract

Investigation of turbulent characteristics of twin jet near the free surface was carried out experimentally at four offset height ratios of 1, 2, 3 and 4. The experiments were conducted using square orifice nozzle pair with separation ratio of 2.6 at Reynolds number of 3890. The effect of the free surface as well as the effect of the offset height ratio on the streamwise mean velocity, streamwise turbulence intensity and Reynolds shear stress were discussed. The velocity decay and jet spread were quantified in order to characterize the effect of offset height on entrainment and mixing performance. The flow dynamics at the free surface was characterized by observing the variation of streamwise mean velocity and turbulence intensities at the free surface. Proper orthogonal decomposition was performed and the role of the energetic structures in the surface attaching twin jet was discussed both qualitatively and quantitatively.

Copyright © 2016 by ASME

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