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Statistics of particle pair separations in the elastic turbulent flow of a dilute polymer solution

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: T. Burghelea, E. Segre and V. Steinberg

Editorial: Euro Phys. Letters, 68, p.529, 2004.


We investigate experimentally the statistics of a chaotic flow of a dilute polymer
solution in a regime of elastic turbulence by using the Lagrangian coordinates approach. We
show that due to flow smoothness at small scales the Finite Time Lyapunov Exponent (FTLE)
technique can be successfully used to investigate the statistics of particle pair separations
at different scales. We compare the measured FTLE with the characteristics of statistical
description in the Eulerian coordinate presentation, namely the velocity correlation times and
the average velocity gradients. We characterize the flow intermittency by measuring high-order
moments of the statistics of the particle pair separations.

Cuvinte cheie: elastic turbulence, Lagrangian frame, Lyapunov exponents