Mass transfer in the boundary layer with combustion in the wide range of Reynolds numbers can be classified as transition from the laminar to the turbulent mass transfer. The relative ethanol fluxes relate to the whole range of combustion behind a barrier with h =3 mm, Tu =1% at the air flow of the room temperature (up to flame separation at ~70 m/s). Experimental data divide into layers and the dependence of "laminar" type reiterates at some new levels. It was shown, this layering is connected with the formation of the large-scale structures.