Mass or energy diffusion mechanisms in turbulent mixing layers

Two series of experiments dealing wih the turbulent diffusion mechanism are presented: the first one consists of determining the temperature of a thin plate subjected on one of its faces to the convection flux of an external flow and cooling on part of its other face; the second concerns the study of the mixing of a jet emitted at the wall with an external flow. Both are related to studies concerning turbine blade cooling. The quantitative analysis of the results was performed through a computing diffusion phenomenon from a mixing length scheme; a simplified study of the mechanisms leads to an analytical expression of the behavior of parameters such as surface temperature or concentration along the wall.