Dresden 2009 – wissenschaftliches Programm
CPP 12.3: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Dynamics of rolling ferrofluidic drops propelled by a rotating magnetic field — •Fabian Rittweg, Reinhard Richter, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth
We report on the controlled transport of drops of magnetic liquid, which are swimming on top of a non-magnetic liquid layer. A magnetic field which is rotating in a vertical plane creates a torque on the drop. Due to surface stresses within the immiscible liquid beneath, the drop is propelled forward. We measure the drop speed for different field amplitudes, field frequencies and drop volumes. The results are compared with simplifying theoretical models proposed by V. Sterr, et al., New J. Phys., 10, 063029 (2008), where also our first measurements can be found.