Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Nonlinear Dynamics, Synchronization and Chaos - Part II
DY 27.6: Talk
Thursday, April 3, 2014, 11:00–11:15, ZEU 160
Periodically driven oscillatory demixing — •Martin Rohloff1,2, Julian Vogel1,2, and Jürgen Vollmer1,2 — 1Max Planck Institute for Dynamics and Self-Organisation (MPIDS), 37077 Göttingen, Germany — 2Faculty of Physics, University of Göttingen, 37077 Göttingen, Germany
Demixing of multiphase fluids with a constant supply of supersaturation can give rise to episodic precipitation of potentially catastrophic impact: geysers, lake outbreaks, volcano eruptions and tropical rain. In all these processes the frequency of this oscillatory demixing is a function of the intensity of the continuous supply. Often, however, convection leads to a periodic modulation of the supply.
Here we present a lab experiment in which repeated precipitation cycles can be observed: A binary liquid mixture that undergoes oscillatory demixing when subjected to a shallow temperature ramp [1]. We perform turbidity measurements to determine the period of the precipitation cycles. Depending on amplitude and frequency of the supply we observe synchronization as well as conditions where only the average supersaturation supply rate is important.
[1] Lapp, T., M. Rohloff, J. Vollmer, B. Hof, 2012 Exp. Fluids 52, 1187