The effects of the flow modulations induced by the grooves on the friction coefficient and the flow features are examined. Torque and pointwise velocity measurements are performed. Such configurations are common in electric motors of high power density and of very high rotation rate, for which better understanding and knowledge of the flow patterns and aerodynamic losses are essential to enhance their design and to develop appropriate cooling systems. Three configurations of inner cylinder having 6,12 and 24 grooves of the same rectangular shape and regularly distributed are compared to a reference smooth cylinder case. The effects of the number of surface grooves on the hydraulic resistance are experimentally investigated in the case of fully turbulent Taylor-Couette flow at a fixed radius ratio η=0.9375 and for Reynolds numbers Rei from 2×10⁴ to 13×10⁴.
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