Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Colloids and Complex Liquids III - External Fields
CPP 45.2: Vortrag
Donnerstag, 17. März 2011, 17:30–17:45, ZEU 114
Meniscus of a ferrofluid around a vertical cylindrical wire carrying electric current — •Kathrin May, Thomas John, and Ralf Stannarius — Institut für Experimentelle Physik, Otto-von-Guericke-Universität Magdeburg
We investigate quantitatively a common presentation experiment in ferrofluids - the shape of a meniscus in the field of a current-carrying wire. Neglecting the surface tension, the height of the free surface profile of the ferrofluid can be determined to h ∝ r−2, where r is the distance to the center of the wire [1]. The influence of the surface tension has been discussed theoretically in [2]. Here we compare these results with experimental data. All material parameters are known, therefore no fitting parameters are used in comparisons. The significant differences between the model in [1] and experimental results can be explained by the influence of the surface tension.
[1] R. E. Rosensweig, Ferrohydrodynamics, Dover Publications, New York, 1997.
[2] Th. John et al., J. Magn. Magn. Mater. 309, 31 (2007).