Turbulent transfer coefficients model for flows over permeable rough surfaces

This paper submits a wall region model of turbulent transfer coefficients f or flows over a permeable rough surface. The model takes into account viola tion of the analogy between the transfer processes of heat and momentum in the vicinity of a rough wall. The results of friction and heat transfer com putations both in boundary layers and pipe flows are compared with measurem ents for different types of roughness, In particular, results show that inc reases in the roughness height undertaken for heat transfer intensification can lead to the opposite effect for fluids with high Prandtl numbers.