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Competing Patterns in a Convective Binary Mixture

1986; American Physical Society; Volume: 57; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.57.2018

1092-0145

Elisha Moses, Victor Steinberg,

Spectroscopy and Quantum Chemical Studies

Pattern observations and heat-transport measurements of convection in ethanol-water mixtures at positive values of the separation ratio $\ensuremath{\psi}$ are presented. Close to onset, the convective flow manifests itself in a stationary square pattern with negligible change in heat transport compared with the conductive state. Far from threshold, convection selects the usual roll structure with a strong change in heat transport. In a crossover region, the competition between square and roll patterns leads to oscillations.