Negative-viscosity effect in a magnetic fluid

J. C. Bacri, R. Perzynski, Mark Shliomis, Georgy Burde

Research output: Contribution to journalArticlepeer-review

208 Scopus citations


The first experimental evidence of a negative-viscosity effect in a magnetic fluid is presented here. In a Poiseuille flow, a constant magnetic field balances vorticity and impedes the rotation of individual magnetic particles. Conversely, an alternating magnetic field helps vorticity and favors this rotation: The magnetic energy is partially transformed into the angular momentum of the particles, which in turn is converted into a hydrodynamic motion of the fluid. It manifests itself in a decrease of the total viscosity: Its rotational part becomes negative. The theory developed here corroborates the experimental results.

Original languageEnglish
Pages (from-to)2128-2131
Number of pages4
JournalPhysical Review Letters
Issue number11
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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