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An experimental study of impulsively started turbulent axisymmetric jets

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  • S. Bajpai
  • M. S. Tirumkudulu

Abstract

An impulsively started turbulent jet injected into quiescent surroundings with a constant inlet velocity has been studied experimentally. Results show that the jet length increases linearly with the square-root of time, over a wide range of Reynolds number calculated with respect to the jet diameter. The celerity factor, x f /t U, has been found to be nearly constant at 2.47 throughout with a 5% variance. Here, x f is the jet length, t is the time and U is the jet exit velocity. These results compare favourably with earlier results reported at lower Reynolds numbers. Finally, we present a simple model based on the integral energy balance of the turbulent boundary layer equation for an impulsively started turbulent axisymmetric jet. The model predicts a jet length that scales as, $(x_f/d)=\sqrt{(9B/10) (t U /d) }$ where d is the nozzle diameter and B(≈6.0) is the velocity-decay constant. This gives a celerity factor, $\alpha\equiv \sqrt{9B/10}=2.32$ in close agreement with the experiments. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Suggested Citation

  • S. Bajpai & M. S. Tirumkudulu, 2008. "An experimental study of impulsively started turbulent axisymmetric jets," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 61(3), pages 293-297, February.
    • Handle: RePEc:spr:eurphb:v:61:y:2008:i:3:p:293-297
    DOI: 10.1140/epjb/e2008-00068-2
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