Concerning the heat and mass transfer features on permeable surfaces

For a boundary layer above the porous surface at a given temperature of main flow and injected gas, the wall heat flux qw depends on the injection intensity in nonmonotonius way. The heat flux first increases with the growth in injection rate jw, then after reaching a maximum it starts decreasing and tends to zero at jw → jcr. The similarity problem between heat and mass transfer is considered for boundary layers with variable content. The effect of the Lewis number Le on similarity conditions was demonstrated. In general case, the similarity ratio is a function not only Lewis number, but also the enthalpy difference. The common formula for description of similarity StTLen = StD “works” only for specific cases. Results on the influence of flow acceleration and turbulence degree Tu on characteristics of a boundary layer with combustion are presented.