Heat transfer in the rectangular passage with 60-degree ribs and film holes

Numerical simulation was conducted to investigate heat transfer in a rectangular channel with both 60-degree rib-roughened wall and film hole suctions with Reynolds number of 9×10⁴ and suction ratio of 0.22.A finite volume method with unstructured meshes was used to solve the three dimensional compressible Navier-Stokes equations.The realizable k-ε model was used carefully and the enhanced wall function was utilized for near wall treatment.The numerical results agree well with the experimental data of the surface with both ribs and film holes.Based on this,investigation was focused on the heat transfer of three other surfaces.The numerical result shows that the flow of the passage is very complex.Heat transfer is enhanced because of the ribs.Maximum Heat transfer coefficient is found on the smooth right surface but not the surfaces with ribs.