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Roughness effects on turbulent plane wall jets in an open channel

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Abstract

This paper reports the effects of surface roughness on the mean flow characteristics for a turbulent plane wall jet created in an open channel. The velocity measurements were obtained using a laser Doppler anemometer over smooth and transitionally rough surfaces. The power law proposed by George et al. (2000) was used to determine the friction velocity. Both conventional scaling and the momentum–viscosity scaling proposed by Narasimha et al. (1973) were used to analyze the streamwise evolution of the flow. The results show that surface roughness increases the skin friction coefficient and the inner layer thickness, but the jet half-width is nearly independent of surface roughness.

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Acknowledgement

The authors gratefully acknowledge financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC).

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Manitoba, 15 Gillson Street, Winnipeg, MB, R3T 5V6, Canada

    M. F. Tachie

  2. Department of Civil and Environmental Engineering, University of Windsor, 401 Sunset Ave., Windsor, N9B 3P4, Canada

    R. Balachandar

  3. Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, S7N 5A9, Canada

    D. J. Bergstrom

Authors
  1. M. F. Tachie
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  2. R. Balachandar
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  3. D. J. Bergstrom
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Correspondence to M. F. Tachie.

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Tachie, M.F., Balachandar, R. & Bergstrom, D.J. Roughness effects on turbulent plane wall jets in an open channel. Exp Fluids 37, 281–292 (2004). https://doi.org/10.1007/s00348-004-0816-0

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  • DOI: https://doi.org/10.1007/s00348-004-0816-0

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