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Non-newtonian viscosity of complex-plasma fluids.

A V Ivlev1, V Steinberg, R Kompaneets

  • 1Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany. ivlev@mpe.mpg.de

Physical Review Letters
|May 16, 2007
PubMed
Summary

This study investigated shear flows in complex plasma fluids. Results show complex plasmas exhibit non-Newtonian behavior and shear thinning, especially at high shear rates.

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Area of Science:

  • Plasma Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Complex plasmas, often generated in DC discharges, are unique states of matter with unique fluid properties.
  • Understanding the rheological behavior of these plasmas is crucial for applications and fundamental science.

Purpose of the Study:

  • To investigate shear flows in three-dimensional complex plasma fluids.
  • To measure the viscosity of complex plasmas across a wide range of shear rates.
  • To identify non-Newtonian characteristics in complex plasma behavior.

Main Methods:

  • Inducing shear flow using inhomogeneous gas flow or laser beams.
  • Measuring plasma viscosity under varying shear rates, approaching the hydrodynamic limit.
  • Analyzing fluid behavior at different scales, including where particle discreteness is significant.

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Main Results:

  • Complex plasmas exhibit significant non-Newtonian fluid behavior.
  • Shear thinning was observed, indicating a decrease in viscosity with increasing shear rate.
  • Viscosity measurements extended to the hydrodynamic limit, revealing behavior influenced by particle discreteness.

Conclusions:

  • Complex plasmas display non-Newtonian characteristics, specifically shear thinning.
  • The study provides valuable data on complex plasma rheology, particularly near the hydrodynamic limit.
  • Findings contribute to a deeper understanding of fluid dynamics in complex plasma systems.