Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2005-05-11
Nonlinear Sciences
Pattern Formation and Solitons
46 pages, 11 figures. Accepted for publication in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.72.026307
Nonlinear fronts between spatially extended traveling wave convection (TW) and quiescent fluid and spatially localized traveling waves (LTWs) are investigated in quantitative detail in the bistable regime of binary fluid mixtures heated from below. A finite-difference method is used to solve the full hydrodynamic field equations in a vertical cross section of the layer perpendicular to the convection roll axes. Results are presented for ethanol-water parameters with several strongly negative separation ratios where TW solutions bifurcate subcritically. Fronts and LTWs are compared with each other and similarities and differences are elucidated. Phase propagation out of the quiescent fluid into the convective structure entails a unique selection of the latter while fronts and interfaces where the phase moves into the quiescent state behave differently. Interpretations of various experimental observations are suggested.
Jung Donghwa
Luecke Manfred
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