Phys. Rev. Lett. 86, 4827–4830 (2001)Passive Scalar Intermittency in Low Temperature Helium FlowsReceived 11 July 2000; published in the issue dated 21 May 2001 We report new measurements of mixing of passive temperature field in a turbulent flow. The use of low temperature helium gas allows us to span a range of microscale Reynolds number, Rλ, from 100 to 650. The exponents ξn of the temperature structure functions 〈|θ(x+r)-θ(x)|n〉∼rξn are shown to saturate to ξ∞≃1.45±0.1 for the highest orders, n∼10. This saturation is a signature of statistics dominated by frontlike structures, the cliffs. Statistics of the cliffs' characteristics are performed, particularly their widths are shown to scale as the Kolmogorov length scale. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4827
DOI:
10.1103/PhysRevLett.86.4827
PACS:
47.27.Jv, 47.27.Qb
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