Measurements of Scalar Power Spectra in High Schmidt Number Turbulent Jets
Abstract
Single-point, jet-fluid concentration measurements obtained from high Schmidt number (Sc -- 1.9 x 10 to the 3rd power) turbulent jets permit an investigation of temporal scalar power spectra, for *et Reynolds numbers in the range of 1.25 less than or equal to Re x 10-4 less than or equal to 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 1-k power-law behavior, possessing a log-normal region over a range of scales exceeding a factor of 40, in some cases.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 09, 1992
- Accession Number
- ADA261542
Entities
People
- Paul E. Dimotakis
- Paul L. Miller
Organizations
- California Institute of Technology