Journal of Fluid Mechanics

Measurements of scalar power spectra in high Schmidt number turbulent jets

Paul L.  Miller a1p1 and Paul E.  Dimotakis a1
a1 Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA

Article author query
miller pl   [Google Scholar] 
dimotakis pe   [Google Scholar] 


We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc [simeq R: similar, equals] 1.9 × 103), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25 × 104 [less-than-or-equal] Re [less-than-or-equal] 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.

(Published Online April 26 2006)
(Received March 4 1995)
(Revised September 2 1995)

p1 Current address: Lawrence Livermore National Laboratory; PO Box 808, L-022; Livermore, CA 94551, USA