Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 4: Focus Session: Atmospheric and Climate Complexity
DY 4.5: Vortrag
Montag, 11. März 2013, 17:00–17:15, H47
Rain in a test-tube! — •Martin Rohloff1,2 and Jürgen Vollmer1,2 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany — 2Faculty of Physics, University of Göttingen, 37077 Göttingen, Germany
Demixing of multiphase fluids is important for precipitation in the atmosphere of the earth and other planets. The mechanisms of droplet growth that lead to precipitation are under vivid discussion.
We present a lab experiment in which repeated precipitation cycles can be observed. Binary mixtures of liquids are used as model systems. They undergo demixing when subjected to a shallow temperature ramp. We perform measurements of the droplet size distribution and turbidity measurements. Having access to the droplet size distribution for many oscillations and different types of binary mixtures, we identify the dependence on different material parameters like density, viscosity, surface tension, as well as the influence of heating rate and sample geometry.