A. Laporta et al., TRANSITION BETWEEN CURVED AND ANGULAR TEXTURES IN BINARY-FLUID CONVECTION, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 53(1), 1996, pp. 570-576
We report a transition from a curved texture to an angular texture in
Rayleigh-Benard convection in a mixture of ethanol and water. The tran
sition occurs as the Rayleigh number is reduced from a high value and
approaches the traveling-wave branch and is observed at negative value
s of the separation ratio in fluid mixtures, but not in a pure fluid.
We show that this transition may be understood in terms of a generaliz
ation of the Swift-Hohenberg free energy functional. A large increase
in wave-number rigidity is observed as the traveling-wave transition i
s approached.