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Diffusion of Heat as a Passive Contaminant in a Slightly Pulsating jet

  • H. Lemonnier
  • M. Favre-Marinet
  • G. Binder
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Summary

Results on the diffusion of a passive contaminant (heat) by a round jet subjected to small amplitude periodic forcing at the frequency of the preferred mode are presented. The instantaneous isotherm pattern show the growth of coherent structures in the mixing layer from the nozzle to a distance 3d0 downstream. The temperature in the core of these structures is approximately uniform whereas on both sides of the mixing layer a sharp temperature gradient gives rise to intense θ- fluctuations. The structures begin to lose their coherence beyond 3d0 and are partially blurred by the turbulence which is developing. It is nevertheless observed that the structures convected downstream have a strong influence on the temperature on the jet axis. The isotherms are slowly stretched and then rapidly compressed during a cycle. Hot fluid is ejected outwards from the axis on the leading edge of the structures and cold fluid is trapped inwards on the trailing edge.

Keywords

Shear Layer Coherent Structure Vortex Ring Strouhal Number Cold Fluid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Crow, S., Champagne, F.M.: Orderly structure in jet turbulence, J. Fluid Mech., 48, 547 - 591, 1971.CrossRefADSGoogle Scholar
  2. 2.
    Yule, A.J.: Large-scale structure in the mixing layer of a round jet, J. Fluid Mech., 89, 4l3–432, 1978.Google Scholar
  3. 3.
    Favre-Marinet, M., Binder, G.: Structure des jets puisants, J. de Mécanique, vol. 18, n° 2, 355–394, 1979.ADSGoogle Scholar
  4. 4.
    Zaman K.B.M.Q., Hussain A.K.M.F.: Vortex pairing in a circular jet under controlled excitation, J. Fluid Mech., vol. 101, part 3, 494 - 544, 1980Google Scholar
  5. 5.
    Hussain A.K.M.F. and Clark A.R.: On the coherent structure of the axisymmetric mixing layer: a flow-visualisation study, J. Fluid Mech., vol. 104, 263–294, 1981.CrossRefADSGoogle Scholar
  6. 6.
    Patnaik P.O., Sherman F.S. and Corcos G.M.: A numerical simulation of Kelvin-Helmholtz waves of finite amplitude, J. Fluid Mech., vol. 73, part 2, 215–240, 1976.CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag, Berlin, Heidelberg 1981

Authors and Affiliations

  • H. Lemonnier
    • 1
  • M. Favre-Marinet
    • 1
  • G. Binder
    • 1
  1. 1.Institut de Mécanique de GrenobleGrenoble-CedexFrance

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