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Related Experiment Videos

Vortex pairs in viscoelastic Couette-Taylor flow.

M Lange1, B Eckhardt

  • 1Fachbereich Physik, Philipps Universität Marburg, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2001
PubMed
Summary

Researchers observed paired vortices, or "diwhirls," in dilute polymer solutions. Calculations using the Oldroyd-B model successfully replicated these diwhirl states, matching experimental observations.

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Area of Science:

  • Fluid dynamics
  • Polymer physics
  • Rheology

Background:

  • Experiments with dilute polymers between rotating cylinders revealed non-equidistant vortex spacing.
  • These non-uniform vortex patterns were termed "diwhirls" by Groisman and Steinberg.

Purpose of the Study:

  • To theoretically investigate and calculate the formation of diwhirl states.
  • To validate the Oldroyd-B model's ability to describe polymer fluid dynamics under specific conditions.

Main Methods:

  • Utilizing the Oldroyd-B viscoelastic fluid model.
  • Adapting model parameters to match the experimental conditions of dilute polymer solutions between rotating cylinders.

Main Results:

  • The Oldroyd-B model successfully predicted the formation of diwhirl states.
  • Calculated characteristics of the diwhirls showed good agreement with experimental observations.

Conclusions:

  • The Oldroyd-B model provides a valid framework for understanding diwhirl formation in dilute polymer solutions.
  • The study confirms the model's capability in predicting complex flow phenomena in viscoelastic fluids.

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