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- W3132636478 abstract "Abstract Difficulties in studying turbulent flows stem, in part, from the lack of high-frequency, high-resolution measurements to interrogate small-scale structures and their rapid evolution. We present analysis of data from experiments employing a burst-mode laser system to capture both spatially resolved velocity fields and their dynamics using high-resolution particle image velocimetry measurements at 100 kHz. We show directly that velocity fluctuations in axisymmetric jet flows are inhomogeneous and anisotropic. The peak of the time-delayed cross correlation function decays exponentially in time and its velocity is smaller than the convection velocity; thus, Taylor’s frozen hypothesis fails to generalize for these inhomogeneous flows. Structure functions are isotropic only at small distances. They exhibit extended self-similarity, but no inertial range is found where the Kolmogorov $$frac{2}{3}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mfrac> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:mfrac> </mml:math> -law is satisfied. Spectral-energy density of the flow, although anisotropic, is consistent with the Kolmogorov–Obukhov $$frac{5}{3}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mfrac> <mml:mrow> <mml:mn>5</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:mfrac> </mml:math> -law in the flow direction." @default.
- W3132636478 created "2021-03-01" @default.
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- W3132636478 date "2021-02-22" @default.
- W3132636478 modified "2023-10-16" @default.
- W3132636478 title "Deviations from Taylor’s frozen hypothesis and scaling laws in inhomogeneous jet flows" @default.
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- W3132636478 doi "https://doi.org/10.1038/s42005-021-00528-0" @default.
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