Rotor blades cooling is one of the most critical aspects to consider for gas turbines. The power generated by the turbine is strongly dependent on the inlet temperature of burned gas. At the same time, increasing gas inlet temperature, it is important to guarantee an efficient cooling system to avoid thermal and mechanical problems at the blades. Turbulated channels represent one of the most used solutions. This method is classified as internal cooling system and uses extracted air from the compressor stage that flows into channels from the lower part of the blade toward the tip, being deflected by ribs. Enhancing turbulence, the presence of ribs improves heat exchange between the coolant and the walls, producing on the other hand an increase of pressure losses and so also of the friction factor.