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Related Experiment Videos

Rod-climbing effect in Newtonian fluids.

Daniel Bonn1, Mathias Kobylko, Steffen Bohn

  • 1Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24 Rue Lhomond, 75231 Paris cedex 05, France. bonn@lps.ens.fr

Physical Review Letters
|December 17, 2004
PubMed
Summary

Rod climbing in fluids is not exclusive to non-Newtonian polymers. This study reveals that Newtonian fluids can exhibit rod climbing due to Taylor-Couette instability in the less viscous fluid layer.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Non-Newtonian fluids

Background:

  • Rod climbing is a phenomenon observed when a rotating rod is inserted into a polymer melt or concentrated solution.
  • This effect has traditionally been attributed to normal stress effects, characteristic of non-Newtonian fluids.
  • Rod climbing at a two-fluid interface has been considered a signature of normal stress in one of the fluids.

Purpose of the Study:

  • To investigate the occurrence of rod climbing in simple Newtonian fluids.
  • To determine if rod climbing can be observed at the interface of two Newtonian fluids with different viscosities.
  • To challenge the established understanding of rod climbing as solely a non-Newtonian phenomenon.

Main Methods:

  • Experimental setup involving a rotating rod and two immiscible Newtonian fluids of differing viscosities.

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  • Observation and analysis of the fluid interface behavior when the rod is introduced and rotated.
  • Comparison of fluid behavior under conditions conducive to Taylor-Couette instability.

    • Main Results:

    • Rod climbing was observed at the interface of two Newtonian fluids.
    • The rod climbing effect occurred specifically when a Taylor-Couette instability developed in the less viscous fluid.
    • No significant rod climbing was observed when the instability occurred in the more viscous fluid or in the absence of instability.

    Conclusions:

    • Rod climbing is not exclusively a non-Newtonian fluid effect.
    • Taylor-Couette instability in a less viscous Newtonian fluid can induce rod climbing at a two-fluid interface.
    • The phenomenon provides a new perspective on interfacial fluid dynamics and the interpretation of rod climbing experiments.