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Published May 1, 1991 | public
Journal Article Open

Reynolds number dependence of scalar fluctuations in a high Schmidt number turbulent jet


The scalar rms fluctuations in a turbulent jet were investigated experimentally, using high-resolution, laser-induced fluorescence techniques. The experiments were conducted in a high Schmidt number fluid (water), on the jet centerline, over a jet Reynolds number range of 3000<=Re<=24 000. It was found that the normalized scalar rms fluctuations c[script ']/ c-bar decrease with increasing flow Reynolds number, at least for the range of Reynolds numbers investigated. Since c[script ']/ c-bar is a measure of the inhomogeneity of the scalar field, this implies that high Schmidt number turbulent jets become more homogeneous, or better mixed, with increasing Re. These findings need to be assessed in the context of the documented Reynolds number independence of flame length for Re>3000 or 6500.

Additional Information

© 1991 The American Physical Society. (Received 28 August 1990; accepted 9 January 1991) We would like to acknowledge the contributions of D. Lang to the experiments, as well as helpful discussions with J.E. Broadwell and A.R. Kerstein. This work was performed under AFOSR Grants No. 83-0213 and No. 88-0155, and GRI Contract No. 5087-260-1467.


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