Experimental investigation of the effects of transverse vibration on the supercritical CO2 heat transfer characteristics in horizontal tubes

It is inevitable for mechanical motion to generate vibration, which may affect fluid heat transfer. Although some developments on heat transfer in supercritical carbon dioxide (S-CO 2 ) have been established, there is none research on the impact of vibration on S-CO 2 heat transfer currently. The effect of transverse vibration on heat transfer characteristics of S-CO 2 in 1200 mm tube is investigated experimentally in this study. The results demonstrate that the vibration enhances the heat transfer of S-CO 2 clearly. With the increase of the vibration amplitude, frequency, mass flux, or pressure, the heat transfer enhancement efficiency ( HTE ) tended to rise, and the HTE of the upper vertex is better than the lower vertex. Within the test range, the highest average HTE is 10.2%. Along the tube, the local HTE in the pseudo critical region is much more noteworthy than in other regions. Finally, the heat transfer correlation is proposed in accordance with the experimental findings, and 95.6% of the data error is within & PLUSMN;15%.& COPY; 2023 Elsevier Ltd. All rights reserved.

Automated summary

This study experimentally investigates the impact of transverse vibration on heat transfer characteristics of S-CO 2 in a 1200 mm tube. The results demonstrate that vibration significantly enhances the heat transfer of S-CO 2. The heat transfer enhancement efficiency (HTE) tends to rise with the increase of vibration amplitude, frequency, mass flux, or pressure, and the HTE of the upper vertex is better than the lower vertex. Within the tested range, the highest average HTE is 10.2%. The local HTE in the pseudo critical region is much more noteworthy than in other regions. Finally, a heat transfer correlation is proposed based on the experimental findings, with 95.6% of the data error within ±15%.