Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.64: Poster

Donnerstag, 29. März 2007, 16:00–18:00, Poster D

Response of a ferrofluid to travelling stripe forcing — •Achim Beetz, Reinhard Richter, and Ingo Rehberg — Universität Bayreuth

A travelling stripe forcing excitation is applied for the first time to the surface of magnetic liquids in the advent of the Rosensweig instability. We investigate the response of the ferrofluid, in particular the amplitude of travelling waves, under variation of the magnetic field strength and the driving velocity. If the native propagation velocity v of the ferrofluid corresponds to the driving speed, the amplitude of the travelling waves shows a maximum. By fitting the data with an amplitude equation of a damped forced oscillation, one can obtain the critical Rosensweig field (at v=0) and a part of the dispersion relation at a fixed wavenumber.