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The effect of density ratio on the near field of a naturally occurring oscillating jet

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Abstract

The triangular oscillating jet nozzle generates a triangular jet partially confined within an axi-symmetric chamber to produce a large scale flow oscillation that has application in thermal processes. Particle image velocimetry and oscillation frequency measurements were conducted to investigate the influence of the jet fluid to ambient fluid density ratio on the resulting oscillating flow. The investigation was conducted with a jet momentum flux of 0.06 kg m s−2 (Re = 7.3−47.2 × 103) and density ratios ranging from 0.2 to 5.0. The initial spread and decay of the emerging jet was found to depend upon the density ratio but in a more complex way than does an unconfined jet. Both the spread and decay are strongly influenced by the instantaneous angle of jet deflection, with greater deflection leading to increased spreading and decay of the jet. Decreasing the density ratio below unity results in a rapid decrease in the deflection angle, while increasing the density ratio above unity results in an increase in the deflection angle, albeit with less sensitivity. The frequency of oscillation was also shown to depend on the density ratio with an increase in the density ratio causing a decrease in the dominant oscillation frequency.

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Acknowledgments

This research has been jointly supported by the Australian Research Council and the FCT-group of companies through a linkage grant. The TEC Laser Diagnostics laboratory is also supported by the ARC. Helpful discussions with Dr. N. L. Smith and Dr. J. J. Parham are also gratefully acknowledged.

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Adelaide, Adelaide, Australia

    Grant England, Peter A. M. Kalt, Graham J. Nathan & Richard M. Kelso

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  1. Grant England
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  2. Peter A. M. Kalt
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  3. Graham J. Nathan
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  4. Richard M. Kelso
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Correspondence to Grant England.

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England, G., Kalt, P.A.M., Nathan, G.J. et al. The effect of density ratio on the near field of a naturally occurring oscillating jet. Exp Fluids 48, 69–80 (2010). https://doi.org/10.1007/s00348-009-0706-6

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  • DOI: https://doi.org/10.1007/s00348-009-0706-6

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