The increase in global energy demand has driven technological advancements aimed at improving the performance of machines used for energy production, particularly Land-Based Gas Turbines (LBGT). In the last decade, enhancements in compression ratio and Turbine Inlet Temperature (TIT) have led to a 40% improvement in efficiency, made possible by the adoption of Additive Manufacturing (AM), as opposed to traditional casting techniques. This study examined the flow dynamics under irregular texture typical of AM-produced products. Cooling channels were sectioned and up-scaled for testing on a rig, where PIV (Particle Image Velocimetry) technique was employed for the analysis. The validation of the setup and measurements enabled the examination of three multi-scale rough surfaces with irregular patterns.