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Dynamical Slowdown of Polymers in Laminar and Random Flows

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Vincenzi,  D.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Celani, A., Puliafito, A., & Vincenzi, D. (2006). Dynamical Slowdown of Polymers in Laminar and Random Flows. Physical Review Letters, 97, 118301-1-118301-4. doi:10.1103/PhysRevLett.97.118301.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-14B5-A
Abstract
The influence of an external flow on the relaxation dynamics of a single polymer is investigated theoretically and numerically. We show that a pronounced dynamical slowdown occurs in the vicinity of the coil-stretch transition, especially when the dependence on polymer conformation of the drag is accounted for. For the elongational flow, relaxation times are exceedingly larger than the Zimm relaxation time, resulting in the observation of conformation hysteresis. For random smooth flows, hysteresis is not present. Yet, relaxation dynamics is significantly slowed down because of the large variety of accessible polymer configurations. The implications of these results for the modeling of dilute polymer solutions in turbulent flows are addressed.