Effect of various rib arrangements on heat transfer in a semicylinder channel with effusion flow

The flow and heat transfer characteristics of various rib configurations on a concave channel surface with effusion holes were investigated. A semicylindrical channel with three rows of effusion holes was used to simplify the blade leading edge and eight kinds of ribs were attached on the internal concave surface for comparison. Continuous and broken ribs were both applied at 90 similar to, as were upstream-pointed V-shaped and downstreampointed V-shaped ribs. The Reynolds-averaged Navier-Stokes equation was solved using commercial software. The result included the divided-areaaveraged and local Nusselt number distribution; the overall average Nusselt number on the concave surface is also discussed.