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Experiments in Fluids

, Volume 34, Issue 4, pp 449–459 | Cite as

Transverse velocity and temperature derivative measurements in grid turbulence

  • T. Zhou
  • R. A. Antonia
  • J-J. Lasserre
  • M. Coantic
  • F. Anselmet
Article

Abstract

The same probe, comprising two parallel wires, is used to measure either velocity or temperature derivatives in shearless grid turbulence at a Taylor microscale Reynolds number of about 40. The aerodynamic interference of the probe affects the mean velocity when the transverse separation Δy between the wires is smaller than about 3η, where η (≃0.4 mm for the present experiments) is the Kolmogorov length scale, but not the mean temperature. Spectra and corresponding moments of transverse velocity and temperature derivatives are significantly but similarly affected when Δy≤3η, thus suggesting that this effect is more likely to be caused by electronic noise than aerodynamic interference. Indeed, after noise corrections are applied, the resulting derivative variances are brought into alignment with values inferred from two-point correlations with respect to y. Transverse derivative variances and their corresponding spectra satisfy isotropy closely but second-order structure functions satisfy it only when the separation is less than about 10η, i.e. the dissipative range scales.

Keywords

Local Isotropy Transverse Velocity Isotropic Turbulence Temperature Derivative Derivative Variance 
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.

Notes

Acknowledgements

RAA gratefully acknowledges the support of the Australian Research Council. An IREX grant support J-J. Lasserre's visit to Newcastle.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • T. Zhou
    • 1
  • R. A. Antonia
    • 2
  • J-J. Lasserre
    • 3
  • M. Coantic
    • 3
  • F. Anselmet
    • 3
  1. 1.School of Mechanical and Production EngineeringNanyang Technological UniversitySingapore
  2. 2.Department of Mechanical EngineeringUniversity of NewcastleAustralia
  3. 3.I.R.P.H.E. Marseille France

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