Passive scalar intermittency in low temperature helium flows

Details Passive scalar intermittency in low temperature helium flows Passive scalar intermittency in low temperature helium flows

2000-07-11

arxiv.org/abs/nlin/0007011v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, with 4 figures

Scientific paper

10.1103/PhysRevLett.86.4827

We report new measurements of turbulent mixing of temperature fluctuations in a low temperature helium gas experiment, spanning a range of microscale Reynolds number, $R_{\lambda}$, from 100 to 650. The exponents $\xi_{n}$ of the temperature structure functions $<|\theta(x+r)-\theta(x)|^n > \sim r^{\xi_{n}}$ are shown to saturate to $\xi_{\infty} \simeq 1.45 \pm 0.1$ for the highest orders, $n \sim 10$. This saturation is a signature of statistics dominated by front-like structures, the cliffs. Statistics of the cliff characteristics are performed, particularly their width are shown to scale as the Kolmogorov length scale.

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