Semiempirical method for estimating the level of heat transfer behind a boundary-layer-separation point

Heat-transfer intensification in a boundary layer reattachment region is shown to be due to the small thickness of the incipient boundary layer as the flow spreads or to the formation of intense turbulence in the incoming flow in a shear jet layer. The level of heat transfer in the reattachment region corresponds to turbulence generation in this shear layer, and experimental results on heat transfer in this region are processed using criteria relating to the length of the separating streamline. For surfaces inside the vortex zone, use is made of methods of heat-transfer estimation based on the hypothesis of the development of a wall boundary layer from the reattachment region to the separation point. With this aim, heat-transfer constants for solving the integral energy equation are determined, and a criterial relationship for the relative heat-transfer law is obtained.