Measurement of local dissipation scales in turbulent pipe flow

Details Measurement of local dissipation scales in turbulent pipe flow Measurement of local dissipation scales in turbulent pipe flow

2009-06-05

arxiv.org/abs/0906.1116v2

Physical Review Letters, 103, 014502 (2009)

Physics

Fluid Dynamics

4 pages, 4 Postscript figures, Physical Review Letters, v1: accepted version, v2: published version, v3: replaced published ve

Scientific paper

10.1103/PhysRevLett.103.014502

Local dissipation scales are a manifestation of the intermittent small-scale nature of turbulence. We report the first experimental evaluation of the distribution of local dissipation scales in turbulent pipe flows for a range of Reynolds numbers, 2.4x10^4<=Re_D<=7.0x10^4. Our measurements at the nearly isotropic pipe centerline and within the anisotropic logarithmic layer show excellent agreement with distributions that were previously calculated from numerical simulations of homogeneous isotropic box turbulence and with those predicted by theory. The reported results suggest a universality of the smallest-scale fluctuations around the classical Kolmogorov dissipation length.

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