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Polymer stretching by turbulence

Chertkov1

  • 1Theoretical Division, T-13 & CNLS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|September 16, 2000
PubMed
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We quantitatively describe how polymer chains stretch in chaotic flows. The steady state balances turbulent stretching and chain resistance, depending on flow and chain properties.

Area of Science:

  • Polymer physics
  • Fluid dynamics
  • Nonlinear dynamics

Background:

  • Polymer chain stretching in chaotic flows is a complex phenomenon.
  • Understanding the steady-state behavior requires balancing forces.

Purpose of the Study:

  • To quantitatively describe the steady-state stretching of a polymer chain in a large-scale chaotic flow.
  • To elucidate the dependencies on flow parameters and polymer chain characteristics.

Main Methods:

  • Analysis of the balance between turbulent stretching and anharmonic chain resistance.
  • Derivation of quantitative relationships based on Lyapunov exponent statistics and polymer properties.

Main Results:

  • A quantitative description of the steady-state polymer chain stretching is achieved.

Related Experiment Videos

  • Explicit dependencies on flow parameters (Lyapunov exponent statistics) and chain characteristics (number of beads, interbead potential) are established.

    • Conclusions:

    • The study provides a clear quantitative model for polymer stretching in chaotic flows.
    • This work clarifies the interplay between fluid dynamics and polymer mechanics.