Reynolds Analogy in the Boundary Layer with External Impact

Various methods of the impact on the boundary layers that make it possible to control the Reynolds analogy factor are considered. The results of investigation of the effect of heat transfer enhancement, superposition of large-scale vortex structures, as well as the longitudinal pressure gradient are described. Dimples of various shapes and arrangements are considered as the way of heat transfer enhancement. Superposition of vortex structures on the wall in the cylinder wake is studied. An adverse pressure gradient is studied in compressible and incompressible nonequilibrium boundary layers, whereas a favorable pressure gradient is studied in a supersonic nozzle. The results obtained show that in the flows considered, the Reynolds analogy factor can be greater than the values for the zero-pressure-gradient boundary layer.