Taylor-Couette-Poiseuille flow and heat transfer in an annular channel with a slotted rotor

- Comparison between experimental and numerical results in a slotted rotor.
- Effect of flow regime on hot spot position and temperature.
- Nusselt number correlations on a rotor pole, inductive faces and notch.
- Correlations found similar to classical Taylor-Couette-Poiseuille flows between two concentric and smooth cylinders.

This paper investigates a Taylor-Couette-Poiseuille flow in an annular channel of a slotted rotating inner cylinder, corresponding to a salient pole hydrogenerator. The purpose of this study is to improve the understanding of flow and thermal phenomena in electrical machines using a simplified scale model. The validation of the numerical model for a specific configuration is first shown by comparing the results with the experimental data. A parametric study is also performed to investigate all main flow regimes and to derive correlations in terms of the Nusselt number distribution on the rotor pole face and sides. The results show that the Nusselt number is proportional to the tangential Reynolds number to the power 1/7 in the pole and inductive faces trailing side. This relationship is similar to the one encountered in classical Taylor-Couette-Poiseuille flows between two concentric and smooth cylinders.