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Flow-regulated nucleation protrusion theory for collapsed polymers.

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Fluid flow significantly impacts polymer unfolding in low strain rate elongational flows by influencing thermally nucleated protrusions. Current models neglecting this effect lead to inaccurate estimations of the globular-stretch transition rate.

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Area of Science:

  • Polymer physics
  • Fluid dynamics
  • Soft matter science

Background:

  • Understanding polymer behavior under flow is crucial for various applications.
  • The globular-stretch transition is a key process in polymer dynamics.
  • Previous studies often simplified the influence of fluid flow on polymer unfolding.

Purpose of the Study:

  • To investigate the effect of low strain rate elongational flow on polymer unfolding.
  • To analyze the role of fluid flow in the formation of polymeric protrusions.
  • To refine the understanding of the globular-stretch transition rate.

Main Methods:

  • Utilizing polymeric protrusion kinetics scaling laws.
  • Employing numerical simulations for analysis.
  • Investigating collapsed polymer behavior in elongational flow.

Main Results:

  • Fluid flow influences the probability of long-length, thermally nucleated polymeric protrusions.
  • These protrusions regulate the unfolding of collapsed polymers in low strain rate flows.
  • The globular-stretch transition rate (k_s) scales with the strain rate (ε̇) as k_s∼e^{-αε̇^{-1}}.

Conclusions:

  • The existing approach of neglecting fluid flow effects on protrusions is invalid for low strain rate polymer unfolding.
  • Neglecting fluid flow effects leads to a twofold overestimation of the constant α in the transition rate scaling law.
  • Accurate modeling of polymer unfolding requires considering the impact of fluid flow on protrusion distribution.