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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.61: Poster

Thursday, February 28, 2008, 16:00–18:00, Poster C

Hexagon–Square Transition of the Rosensweig Instability in the presence of a magnetic ramp — •Leonhard Wiesen, Christian Gollwitzer, Reinhard Richter, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth

The Rosensweig instability has been predicted [1] and found experimentally [2] to show a hexagon-square transition. In a recent experiment we unveiled by means of radioscopy [3] that this transition does show an inverse hysteretic behaviour (proteresis) [4]. In our contribution we reinvestigate this transition in a container with larger aspect ratio and under the influence of a magnetic ramp.
[1] A. Gailitis, J. Fluid Mech. 82, 401 (1977).
[2] B. Abou, J.-E. Wesfreid, S. Roux, J. Fluid Mech. 416, 217 (2001).
[3] R. Richter and J. Bläsing, Rev. Sci. Instrum. 72, 1729 (2001).
[4] C. Gollwitzer, I. Rehberg, and Richter, J. Phys. Condens. Matter 18, 2643 (2006).