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DY: Fachverband Dynamik und Statistische Physik

DY 21: Pattern Formation

DY 21.10: Hauptvortrag

Mittwoch, 2. April 2014, 17:30–18:00, HÜL 186

Episodic Precipitation — •Jürgen Vollmer — Max Planck Institute for Dynamics and Self-Organization (MPI DS), 37077 Göttingen, Germany — Faculty of Physics, Georg August University, 37077 Göttingen, Germany

Episodic outbreaks with potentially catastrophic consequences are characteristic of geysers, as well as lake, oceanic and volcano eruptions. These processes have in common that a slow continuous mass or heat flux into a fluid mixture leads to slow bubble growth, and that episodically the material accumulated in the bubbles is released in explosive precipitation events. The slow growth of the bubbles in response to the flux involves phase separation and ripening. Indeed, periodic modulations of precipitation rates arise also in laboratory experiments where phase separation in binary fluids is monitored during a temperature ramp.
To gain insight into the origin of this episodic precipitation, I revisit the evolution of the droplet size distribution. The net flux to the droplets constitutes an essential perturbation to the Lifshitz-Slezov-Wagner scenario of zero flux. Any finite flux leads to qualitatively different growth laws. Accounting for these differences, I provide a quantitative description of the time scale, Δ t, separating subsequent outbreaks in our experiments.