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  • Journal of Fluid Mechanics, Volume 308
  • February 1996, pp. 129-146

Measurements of scalar power spectra in high Schmidt number turbulent jets

  • Paul L. Miller (a1) (a2) and Paul E. Dimotakis (a1)
  • DOI: http://dx.doi.org/10.1017/S0022112096001425
  • Published online: 01 April 2006
Abstract

We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc ≃ 1.9 × 103), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25 × 104Re ≤ 7.2 × 104. At intermediate scales, we find a spectrum with a slope (logarithmic derivative) that increases in absolute value with Reynolds number, but remains less than 5/3 at the highest Reynolds number in our experiments. At the smallest scales, our spectra exhibit no k−1 power-law behaviour, but, rather, seem to be approximated by a log-normal function, over a range of scales exceeding a factor of 40, in some cases.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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