Analysis of experimental data on heat and mass transfer in a boundary layer

Based on analysis of experimental heat-and mass-transfer data, the intensity of transfer processes is shown to vary discretely and multiply with the intensity in the laminar boundary layer in the transient flow region. In the cases considered, this feature is traced up to Reynolds numbers $\mathrm{Re}_x\approx10^7$. It is manifested not only in the absence of chemical transformations but also in heterogenous and gas-phase combustion. The evolution of heat and mass transfer is regarded as a successive transition from one level of intensity to another. The existence of discrete levels is explained by the presence of a standing wave in the neighborhood of the laminar-turbulent transition.