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Flow-induced structures versus flow instabilities.

M A Fardin1, C Perge2, N Taberlet2

  • 1Université de Lyon, Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS UMR 5672, 46 Allée d'Italie, 69364 Lyon cedex 07, France and The Academy of Bradylogists, Paris, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

Flow instabilities in micellar systems are crucial. Shear-induced structures emerge, leading to chaotic flow patterns similar to polymer solutions, highlighting the interplay between instabilities and structure formation.

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Area of Science:

  • Rheology and fluid dynamics
  • Soft matter physics
  • Complex fluids

Background:

  • Dilute micellar systems can form shear-induced structures under flow.
  • Flow instabilities, characterized by Reynolds and Weissenberg numbers, are significant in such systems.
  • Understanding the transition from stable to unstable flow is key.

Purpose of the Study:

  • To investigate the interplay between flow instabilities and shear-induced structures in a dilute micellar system.
  • To characterize the flow dynamics before and after the nucleation of shear-induced structures.
  • To establish a framework for understanding flow behavior in complex fluids.

Main Methods:

  • Simultaneous rheometry and ultrasonic imaging were employed.
  • Analysis of flow regimes based on Reynolds and Weissenberg numbers.
  • Observation of flow kinematics and structure evolution.

Main Results:

  • Flow instabilities, driven by inertial and elastic effects, were observed.
  • Prior to structure nucleation, inertial instabilities can dominate.
  • Nucleation of shear-induced structures leads to chaotic flow, resembling elastically dominated turbulence.
  • A general framework for the interaction between flow instabilities and induced structures was proposed.

Conclusions:

  • Flow instabilities play a critical role in the behavior of dilute micellar systems.
  • The transition to chaotic flow is linked to the formation of shear-induced structures.
  • The findings provide insights into complex fluid dynamics and turbulence in soft matter.