Heat transfer from a plate to a high-turbulence air flow

Heat transfer from a plate to a high-turbulence air flow is studied experimentally for Reynolds numbers of up to 3 million. It is found that the primary distortion introduced by high turbulence level Tu is in the outer zone of the boundary layer, but that the similitude of the velocity and temperature distributions at the wall is conserved. The variation in local integral characteristics of turbulence manifests itself in a rapid growth of the boundary layer thickness and the filling of the profile, leading to reduction in shape factor H. Skin friction is described satisfactorily by the Ludwieg-Tillman formula, and, as Tu increases, it becomes governed by the variation in H.