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Nonlinear fronts between spatially extended traveling wave convection (TW)and quiescent fluid and spatially localized traveling waves (LTWs) areinvestigated in quantitative detail in the bistable regime of binary fluidmixtures heated from below. A finite-difference method is used to solve thefull hydrodynamic field equations in a vertical cross section of the layerperpendicular to the convection roll axes. Results are presented forethanol-water parameters with several strongly negative separation ratios whereTW solutions bifurcate subcritically. Fronts and LTWs are compared with eachother and similarities and differences are elucidated. Phase propagation out ofthe quiescent fluid into the convective structure entails a unique selection ofthe latter while fronts and interfaces where the phase moves into the quiescentstate behave differently. Interpretations of various experimental observationsare suggested.Comment: 46 pages, 11 figures. Accepted for publication in Phys. Rev.

Traveling wave fronts and localized traveling wave convection in binary fluid mixtures