Münster 1999 – scientific programme

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DY: Dynamik und Statistische Physik

DY 34: Hydrodynamik

DY 34.4: Talk

Wednesday, March 24, 1999, 15:30–15:45, R4

Plume and finger regimes driven by an exothermic interface reaction — •K. Eckert¹ and A. Grahn² — ¹Institut f"ur Luft– und Raumfahrttechnik, TU Dresden, 01062 Dresden — ²Institut f"ur Sicherheitsforschung, Forschungszentrum Rossendorf, PF 510 119, 01314 Dresden

We study the pattern formation in a chemical two-layer system, placed in a Hele-Shaw-cell. The upper layer is an organic solvent in which a fatty acid is dissolved. The lower layer consists of water containing an anorganic base. We report on a novel instability type which is driven by an exothermic neutralization reaction in vicinity of the interface. This instability combines plume and salt finger regimes and gives rise to a self-sustained dynamics.

[] K. Eckert, A. Grahn, subm. to PRL (1998)