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Ballistic imaging in the near-field of an effervescent spray

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Abstract

We have investigated liquid breakup mechanisms in the near nozzle region of a high-pressure effervescent atomizer using ballistic imaging. This technique has revealed various breakup regimes depending upon total flow rate and the gas-to-liquid ratio (GLR). At low total speeds, the jet does not exhibit the wide spread angle and rapid breakup for which effervescent sprays are known, even at high GLR. Above a distinct threshold value for total flow rate, the jet passes through several recognizable flow regimes depending on GLR and it does achieve the expected wide spread angle and rapid breakup. Intermediate GLR’s produce interesting flow patterns that seem to be generated by surging at the nozzle exit, and this surging can probably be attributed to the flow pattern just at the nozzle exit. Indeed, specific interior flows seem to generate the most rapid breakup and should be investigated further.

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Acknowledgments

The authors are grateful for technical assistance from Dr. Shukesh Roy (Spectral Energies, LLC), Mr. Kyle Frische (Innovative Scientific Solutions Inc.), Ms. Amy Lynch (Air Force Research Laboratories), and Dr. K-C. (Stephen) Lin (Taitech Inc.). Dr. Sedarsky was supported by the Swedish Research Council grant no. 621-2004-5504 and Air Force EOARD grant no. FA8655-06-1-3031. Equipment and funding was also provided in part by the Air Force Research Laboratory SBIR program (Barry Kiel, Program Manager) and the Air Force Office of Scientific Research (Drs. Julian Tishkoff and Mitat Birkan, Program Managers).

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Authors and Affiliations

  1. Division of Combustion, Department of Applied Mechanics, Chalmers University, Gothenburg, Sweden

    Mark Linne

  2. Combustion Physics, Lund University, Lund, Sweden

    David Sedarsky

  3. Department of Mechanical Engineering, Iowa State University, Ames, IA, USA

    Terrence Meyer

  4. Air Force Research Lab, Wright-Patterson Air Force Base, Dayton, OH, USA

    James Gord & Campbell Carter

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  1. Mark Linne
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  2. David Sedarsky
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  3. Terrence Meyer
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  4. James Gord
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  5. Campbell Carter
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Correspondence to Mark Linne.

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Linne, M., Sedarsky, D., Meyer, T. et al. Ballistic imaging in the near-field of an effervescent spray. Exp Fluids 49, 911–923 (2010). https://doi.org/10.1007/s00348-010-0883-3

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  • DOI: https://doi.org/10.1007/s00348-010-0883-3

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