Turbine blade cooling is one of the most important developments in gas turbine history. Development of blade cooling enabled increase in firing temperature and in turn improving the efficiency. Different cooling channel geometries have been tested for improving the heat transfer efficiency. Smooth channels, channels with sharp bends, channels with ribs and other such tabulators were used to improve the turbulence and thereby increasing the efficiency. In the recent developments, hemi-spherical dimples are being considered instead of ribs as dimples have less pressure loss. This paper compares numerical computations of the heat transfer characteristics of a dimpled rectangular channel with published experimental values. Reynolds number ranges from 5000 to 40,000. For the numerical computations two different turbulence models, k-ε and k-ω models are used, the software for the simulation was Fluent and grid generation was achieved by Ansys workbench. The dimpled channel results are normalized with the smooth channel results.

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