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Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets

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Abstract

High-speed liquid “curtains” have been proposed to protect solid structures in fusion energy applications. Minimizing free-surface waves and spray formation in such flows is important for effective protection in this application. In this work, free-surface waves and turbulent breakup were studied experimentally in jets of water issuing from a rectangular nozzle into ambient air at a Reynolds number of 1.2 × 105. Laser-Doppler anemometry was used to characterize the streamwise and transverse velocity components in the nozzle for two different flow calming section designs. Planar laser-induced fluorescence was used to measure the free-stream position in the near-field of the sheet. The results suggest that transverse velocity fluctuations in the nozzle are the primary factor in determining the amplitudes of free-surface waves. Removing a small amount of low-speed fluid immediately downstream of the nozzle exit (“boundary-layer cutting”) is shown to both significantly reduce free-surface waves and the amount of spray due to turbulent breakup. Overall, boundary-layer cutting appears to have the greatest benefit when used on a “well-conditioned” turbulent liquid sheet.

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Authors and Affiliations

  1. Sandia National Laboratories, PO Box 5800, MS 0748, Albuquerque, NM, 87185-0748, USA

    S. G. Durbin

  2. G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA

    M. Yoda & S. I. Abdel-Khalik

Authors
  1. S. G. Durbin
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  2. M. Yoda
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  3. S. I. Abdel-Khalik
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Correspondence to M. Yoda.

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Durbin, S.G., Yoda, M. & Abdel-Khalik, S.I. Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets. Flow Turbulence Combust 79, 307–320 (2007). https://doi.org/10.1007/s10494-007-9092-4

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  • DOI: https://doi.org/10.1007/s10494-007-9092-4

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