Analysis on the convective heat transfer in a rotating tube with field synergy principle

The field synergy principle was applied to the cooling system of the generator rotor with rotating coordinate system. Theoretical analyses for convective heat transfer were presented in both rotating system and the static one. A three dimensional model of the axial straight circular rotating tube was built for numerical simulation. The numerical simulation results with different boundary conditions and different rotating speeds were presented to verify the theoretical analysis results. The results show that the work of the solid wall with high rotating speed should be taken into account in the case with pre-rotational inlet condition.