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SYSS: Structure Formation and Self-Organization in non-equilibrium Systems

SYSS 3: Structure Formation and Self-Organization in non-equilibrium Systems - Poster

SYSS 3.14: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Hydrodynamic instabilities in the iodate-arsenous acid reaction — •Lenka Šebestíková, Marcus J. B. Hauser, and Stefan C. Müller — University Magdeburg, Institute of Experimental Physics, Universitaetsplatz 2, 39106 Magdeburg

The splitting of fingers of propagating fronts in the arsenous acid-iodate reaction placed in a vertical Hele-Shaw cell is found to be driven by liquid flow induced by density differences in the gravitational field. The ascending thin reaction front separates the heavier reaction solution from the lighter reacted mixture. During the early stages, the finger structure of the reaction front is formed. As the fingers grow vertically and horizontally, some of them dominate and some annihilate. Correspondingly, the profile of the induced flow that is associated with the fingers is changed. We discuss how the finger splitting is related to the curvature of the reaction front and the adjacent flow field.