Abstract
Three-dimensional calculations of the meniscus of a magnetic fluid placed around a current carrying vertical and
cylindrical wire are presented. Based on the material properties of experimentally used magnetic fluids,
the numerically determined menisci are compared with the experimentally measured ones reported by May.
The comparison is made for a linear law of magnetisation as well as for the experimentally measured nonlinear magnetisation
curve. Up to moderate strengths of the applied current (I<=45 A), i.e., up to moderate strengths of the
magnetic field close to the wire, the calculated profiles agree satisfyingly with the
experimentally measured ones for a linear as well as for a nonlinear law of magnetisation.
At a great strength of the applied current (I=70 A), i.e., at a large strength of the magnetic field
close to the wire, the agreement is less good than in the range
up to moderate strengths. Our analysis revealed that the numerically assumed isothermal
conditions are not present in the experiment, particularly at the great strength of the applied current.
A control of the temperature in the experiment and the implementation of a coupled thermal model
in the numerics are considered the most relevant future steps for an improved agreement.
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