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Published October 22, 2014 | Submitted
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Measurements of scalar power spectra in high Schmidt number turbulent jets


Single-point, jet-fluid concentration measurements obtained from high Schmidt number (Sc ≃ 1.9 x 10^3) turbulent jets permit an investigation of temporal scalar power spectra, for jet Reynolds numbers in the range of 1.25 ≤ Re x 10^(-4)≤ 7.2. At intermediate scales, we find a spectrum with a logarithmic derivative (slope) that is increasing with Reynolds number, in absolute value, but less than 5/3 at the highest Reynolds number in our experiments. At the smallest scales, our spectra exhibit no k^(-1) power-law behavior, possessing a log-normal region over a range of scales exceeding a factor of 40, in some cases.

Additional Information

© 1992 California Institute of Technology GALCIT Report FM92-3. We would like to acknowledge contributions by Dan Lang and David Dowling to the experiments. This work was supported by AFOSR Grants No. 83-0213 and 88-0155. and GRI Contract No. 5087-260-1467.

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