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DY: Fachverband Dynamik und Statistische Physik

DY 17: Poster I

DY 17.58: Poster

Dienstag, 26. Februar 2008, 16:00–18:00, Poster C

Buoyancy-driven hydrodynamic instabilities of chemical reaction fronts — •Lenka Šebestíková and Marcus J. B. Hauser — Otto von Guericke Universität Magdeburg, Institut für Experimentelle Physik, Abteilung Biophysik, Magdeburg

Experimental results on buoyancy-driven hydrodynamic instabilities taking place in a liquid system made of two miscible fluids that are separated by a traveling reaction front are presented. The experiments have been performed in a rectangular-shaped channel, whose top was open to air, allowing for gas/liquid interfaces. The reaction fronts propagate with a certain speed through the channel showing a dependence of the liquid depth on the speed of a propagating reaction front. The liquid depth also affects the dynamics of the system leading to a new type of pattern formation, reminiscent of turbulence patterns. A critical liquid depth for the development of the new type of patterns was determined. We will discuss a possible relationship of the turbulence-like pattern formation and the development of hydrodynamic convection rolls accompanying the traveling reaction front.