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Related Experiment Video

Updated: Feb 3, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
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Flow fluctuations in wormlike micelle fluids.

Paul F Salipante1, Stephen E Meek, Steven D Hudson

  • 1Polymers and Complex Fluids Group, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, USA. paul.salipante@nist.gov.

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Summary
This summary is machine-generated.

Unstable flow in wormlike micelle solutions is driven by entrance geometry. Rapid micelle structural changes cause flow rate jumps, impacting pressure drop and recovery.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Soft Matter Physics

Background:

  • Wormlike micelle solutions exhibit complex flow behaviors.
  • Understanding flow instabilities is crucial for microfluidic applications.

Purpose of the Study:

  • Investigate unstable flow of wormlike micelle solutions in capillary flow.
  • Determine the effect of entrance geometry on fluid fluctuations.
  • Analyze the relationship between micelle structure and flow dynamics.

Main Methods:

  • Particle image velocimetry (PIV) for flow measurement.
  • Pressure drop monitoring across the capillary.
  • Polarized light microscopy for micelle alignment.
  • Dynamical systems modeling and power spectral density analysis.

Main Results:

  • Identified flow rate jumps and pressure drop recovery.
  • Observed transition to unstable flow above a critical rate dependent on entrance geometry.
  • Correlated flow instabilities with rapid breakdown of micelle alignment.
  • Developed a model linking pressure and flow rate dynamics.

Conclusions:

  • Entrance geometry significantly influences flow instabilities in wormlike micelles.
  • Micelle structural transitions are key drivers of observed flow fluctuations.
  • The study provides insights for controlling flow instabilities in such systems.