MILLER, P. L., and DIMOTAKIS, P. E. 1996 "Measurements of scalar power spectra in high Schmidt number turbulent jets," J. Fluid Mech. 308, 129-146.


We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc=1.9x103), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25x104 <= Re <= 7.2x104. 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.