Ferrohydrodynamics: testing a new magnetization equation

Details Ferrohydrodynamics: testing a new magnetization equation Ferrohydrodynamics: testing a new magnetization equation

2001-06-20

arxiv.org/abs/cond-mat/0106415v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, Submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.64.060501

A new magnetization equation recently derived from irreversible thermodynamics is employed to the calculation of an increase of ferrofluid viscosity in a magnetic field. Results of the calculations are compared with those obtained on the basis of two well-known magnetization equations. One of the two was obtained phenomenologically, another one was derived microscopically from the Fokker-Planck equation. It is shown that the new magnetization equation yields a quite satisfactory description of magnetiviscosity in the entire region of magnetic field strength and the flow vorticity. This equation turns out to be valid -- like the microscopically derived equation but unlike the former phenomenological equation -- even far from equilibrium, and so it should be recommended for further applications.

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