Measurements of scalar power spectra in high Schmidt number turbulent jets
Measurements of scalar power spectra in high Schmidt number turbulent jets
复制标题
高施密特数湍流射流中标量功率谱的测量
DOI:
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发表时间:
1992
影响因子:
3.7
通讯作者:
P. Dimotakis
中科院分区:
文献类型:
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作者:
P. Miller;P. Dimotakis
We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc ≃ 1.9 × 103), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25 × 104 ≤ Re ≤ 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.