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Published February 10, 1996 | Published
Journal Article Open

Measurements of scalar power spectra in high Schmidt number turbulent jets


We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc ≃ 1.9 × 10^3), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25 × 10^4 ≤ Re ≤ 7.2 × 10^4. 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.

Additional Information

© 1996 Cambridge University Press. Received 4 March 1995 and in revised form 2 September 1995. Published online: 26 April 2006. We would like to acknowledge contributions by Dan Lang and David Dowling to the experiments. This work was supported by AFOSR Grants Nos. 83-0213, 88-0155, and F4962C92-J-0290, as well as GRI Contract No. 5087-260-1467.

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