Numerical study on vibration heat transfer enhancement of multi-configured blunt-headed cylinder with fin device

The large-scale flow-induced deformation is an effective heat transfer enhancement technology. Then, a blunt-headed cylinder with fin (BHC-F) was proposed to evaluate the heat transfer enhancement performance using flow-induced vibration with different configuration (incident angle Φ ). The two-way fluid structure interaction method was utilized to explore the vibration response, flow field and heat transfer performance of BHC-F at Reynolds numbers Re = 500–1500. Vibration results found that the vibration displacement of BHC-F increased with the increase of Φ (0°–180°), which leaded to the acceleration of flow boundary layer separation . When Φ = 180°, the peak displacement of BHC-F reached 3.12 mm, which was 61.66 % and 34.48 % higher than that of Φ = 0° and 90°, respectively. At this time, heat transfer enhancement was obtained because the thermal boundary layer was reduced due to the interaction between the vortex and the wall. In addition, the PEC under all configurations were all greater than 1, indicating that BHC-F achieved the purpose of enhanced heat transfer. The increase of Re has a positive effect on the heat transfer enhancement of BHC-F. When Re = 1500, the maximum heat transfer enhancement of BHC-F-90° reached 13.8 %, which was 62.3 and 26.6 times higher than that of BHC-F-0° and BHC-F-180°. This study establishes a theoretical foundation for employing flow-induced vibration in heat transfer enhancement applications and offers technical support for enhancing the overall performance of heat exchangers . • A multi-section combined blunt-headed cylinder with fin is proposed. • Heat transfer enhancement comparison is performed using FSI. • Effect of cross-section shape on heat transfer enhancement is compared. • Effect of Φ on the heat transfer in different configurations are revealed. • The maximum heat transfer enhancement of BHC-F-90° reached 13.8 % at Re = 1500.