关键词: 转子, 叶片倾角, 强化传热, 数值模拟

Abstract: The turbulent flow and heat transfer characteristics in tubes with grooved helical lobe rotors of different dip angles were numerically studied. The simulation was based on the RNG turbulence model. SIMPLE algorithm was employed for the coupling between velocity and pressure，and the enhanced wall treatment was applied on the flow and heat transfer of the inner wall of tube side. The velocity field，temperature field and turbulence intensity of tube side were analyzed at a volume flow rate of 2.6m3/h in tube side inlet. Results indicated that the grooved helical lobe rotor could induce a swirling flow，and enhance the tube side convective heat transfer. Considering both heat transfer rate and friction factor，the performance evaluation criteria （PEC） of rotors with different dip angles were compared，rotor with dip angle of 60° had the best thermal performance characteristic.

Key words: rotor assembly, dip angle of lobe, heat transfer enhancement, numerical simulation