English

Journal of Thermal Science

热科学学报

热科学学报 >

2026 , Vol. 35 >Issue 1: 284 - 302

DOI: https://doi.org/10.1007/s11630-025-2183-5

Influences of Circular Rib Geometries on the Heat Transfer Characteristics of Supercritical CO2 in Annular Channels: A Numerical Study

展开
  • 1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
    2. Ocean Institute, Northwestern Polytechnical University, Taicang 215400, China
    3. Research Institute of Aero-Engine, Beihang University, Beijing 102206, China

网络出版日期: 2026-01-05

基金资助

SCO2; annular channel; splitting-rib; heat transfer correlations

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
收起

Influences of Circular Rib Geometries on the Heat Transfer Characteristics of Supercritical CO2 in Annular Channels: A Numerical Study

Expand
  • 1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
    2. Ocean Institute, Northwestern Polytechnical University, Taicang 215400, China
    3. Research Institute of Aero-Engine, Beihang University, Beijing 102206, China

Online published: 2026-01-05

Supported by

SCO2; annular channel; splitting-rib; heat transfer correlations

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Fold

摘要

为提高超临界二氧化碳（SCO2）在环形通道内的冷却效率，本文探究了一种环形肋片分割策略。利用ANSYS Fluent构建了三维仿真模型，选用（SST）k-ω湍流模型，并将模型设置和已有实验数据对比验证。本研究主要关注环形肋片的高度、位置以及半环形肋片之间间距对传热性能的影响。结果表明，当肋片无量纲高度达到0.25及以上时，综合传热因子显著提升。肋片靠近入口时的传热效果更佳，且无量纲位置为0.2时，在所有位置参数中表现最好。在分割肋片方案中，综合传热因子随肋片间无量纲距离的增大而增加，并在无量纲距离为8时达到最大值。当无量纲高度为0.5、无量纲位置为0.2、无量纲距离为8时，综合传热因子较传统结构提升8.2%。本文还建立了适用于此结构的努塞尔数（Nu）及摩擦因子（f）关联式，多数数据点的计算值与关联式预测值偏差在±10%以内。环形肋片分割策略不仅能够强化传热，还能够显著降低压力损失。本研究为旋转轴类部件的热管理提供了新的有效途径，有望提高此类部件的运行安全性与效率，为热工设计人员在实际系统优化中提供参考。

关键词： SCO2; annular channel; splitting-rib; heat transfer correlations

本文引用格式

DUAN Hangfei, JIN Puhang, XIE Gongnan, XIA Yakang . Influences of Circular Rib Geometries on the Heat Transfer Characteristics of Supercritical CO2 in Annular Channels: A Numerical Study[J]. 热科学学报, 2026 , 35(1) : 284 -302 . DOI: 10.1007/s11630-025-2183-5

Abstract

To enhance cooling efficiency by supercritical CO2 in annular structures, this study meticulously explores a rib-splitting strategy. Utilizing Shear Stress Transport (SST) k-ω within ANSYS Fluent, three-dimensional models are developed and simulated, with settings validated against existing experimental data. The investigation focuses on various structural parameters, including the height and position of circular ribs, and the spacing between semicircular ribs. Key findings reveal that a notable enhancement in heat transfer, measured by the comprehensive heat transfer factor, is observed when the rib’s dimensionless height reaches at least 0.25. Closer to the inlet, higher heat transfer performance is achieved, with a dimensionless position of 0.2 exhibiting the best performance across all instances about position effects. The rib-splitting approach has been proven effective in enhancing heat transfer performance, with the comprehensive heat transfer factor increasing progressively with the dimensionless distance and reaching its maximum at a value of 8. The heat transfer enhancement is characterized by an 8.2% increase in the comprehensive heat transfer factor, achieved with a rib’s dimensionless height of 0.5, a dimensionless position of 0.2, and a dimensionless distance of 8. The derived correlations for the Nusselt number (Nu) and friction factor (f) demonstrate the high accuracy of our computational models, as most cases fall within a ±10% deviation range. Crucially, the results advocate for the rib-splitting method’s efficacy in not only enhancing heat dissipation but also in mitigating pressure loss to a significant degree. The insights gained from this study hold considerable promise for thermal management in shafts, potentially elevating both their operational safety and efficiency. The rib-splitting strategy could be a valuable addition to the toolbox of thermal engineers seeking to optimize the performance of their systems.

Key words： SCO2; annular channel; splitting-rib; heat transfer correlations

参考文献

[1] Xie G., Xu X., Lei X., et al., Heat transfer behaviors of some supercritical fluids: A review. Chinese Journal of Aeronautics, 2022, 35(1): 290–306.
[2] Ahn Y., Bae S.J., Kim M., et al., Review of supercritical CO2 power cycle technology and current status of research and development. Nuclear Engineering and Technology, 2015, 47(6): 647–661.
[3] Binotti M., Astolfi M., Campanari S., et al., Preliminary assessment of sCO2 cycles for power generation in CSP solar tower plants. Applied Energy, 2017, 204: 1007–1017. 
[4] Song J., Wang Y., Wang K., et al., Combined supercritical CO2 (SCO2) cycle and organic Rankine cycle (ORC) system for hybrid solar and geothermal power generation: Thermoeconomic assessment of various configurations. Renewable Energy, 2021, 174: 1020–1035. 
[5] Zhang X.R., Yamaguchi H., Fujima K., et al., Theoretical analysis of a thermodynamic cycle for power and heat production using supercritical carbon dioxide. Energy, 2007, 32(4): 591–599.
[6] Wu P., Ma Y., Gao C., et al., A review of research and development of supercritical carbon dioxide Brayton cycle technology in nuclear engineering applications. Nuclear Engineering and Design, 2020, 368: 110767. 
[7] Li Z., Shi M., Shao Y., et al., Supercritical CO2 cycles for nuclear-powered marine propulsion: preliminary conceptual design and off-design performance assessment. Journal of Thermal Science, 2024, 33(1): 328–347.
[8] Qin L., Xie G., Ma Y., et al., Thermodynamic analysis and multi-objective optimization of a waste heat recovery system with a combined supercritical/transcritical CO2 cycle. Energy, 2023, 265: 126332.
[9] Feng F., Li T., An J., et al., Performance assessment of a novel polygeneration system based on the integration of waste plasma gasification, tire pyrolysis, gas turbine, supercritical CO2 cycle and organic Rankine cycle. Journal of Thermal Science, 2023, 32(6): 2196–2214.
[10] Fairuz Z.M., Jahn I., Abdul-Rahman R., The effect of convection area on the deformation of dry gas seal operating with supercritical CO2. Tribology International, 2019, 137: 349–365.
[11] Yuan T., Yang R., Li Z., et al., Thermal characteristics and cooling effect for SCO2 dry gas seal with multiple dynamic groove types. Applied Thermal Engineering, 2024, 236: 121896.
[12] Uddin M., Gurgenci H., Guan Z., et al., Design a cooling pillow to support a high-speed supercritical CO2 turbine shaft. Applied Thermal Engineering, 2021, 196: 117345.
[13] Peeters J.W.R., T’Joen C., Rohde M., Investigation of the thermal development length in annular upward heated laminar supercritical fluid flows. International Journal of Heat and Mass Transfer, 2013, 61: 667–674.
[14] Peeters J.W.R., Pecnik R., Rohde M., et al., Characteristics of turbulent heat transfer in an annulus at supercritical pressure. Physical Review Fluids, 2017, 2(2): 024602.
[15] Qin K., Li D., Huang C., et al., Numerical investigation on heat transfer characteristics of Taylor Couette flows operating with CO2. Applied Thermal Engineering, 2020, 165: 114570.
[16] Uddin M., Gurgenci H., Klimenko A., et al., Heat transfer analysis of supercritical CO2 in a high-speed turbine rotor shaft cooling passage. Thermal Science and Engineering Progress, 2023, 39: 101694.
[17] Xiao Y., Pan J., Gu H., Numerical investigation of spacer effects on heat transfer of supercritical fluid flow in an annular channel. International Journal of Heat and Mass Transfer, 2018, 121: 343–353.
[18] Eze C., Wong K.W., Gschnaidtne T., et al., Numerical study of effects of vortex generators on heat transfer deterioration of supercritical water upward flow. International Journal of Heat and Mass Transfer, 2019, 137: 489–505.
[19] Eze C., Lau K.T., Ahmad S., et al., Mitigation of heat transfer deterioration in a circular tube with supercritical CO2 using a novel small-scale multiple vortex generator. International Journal of Thermal Sciences, 2020, 156: 106481.
[20] Gond A.K., Basu D.N., Dalal A., Numerical investigation of heat transfer characteristics of CO2 in a vertical divergent tapered annular channel. Fluid Mechanics and Fluid Power, 2024, 1: 483–493.
[21] Wong K.W., Cheng H., Zhao J., Numerical study on mitigation of heat transfer deterioration in supercritical CO2 heat exchanger application. 25th International Conference on Nuclear Engineering, Shanghai, China, 2017, 6: V006T08A104. 
DOI: https://doi.org/10.1115/ICONE25-67612. 
[22] Yuan H., Edlebeck J., Wolf M., et al., Simulation of supercritical CO2 flow through circular and annular orifice. Journal of Nuclear Engineering and Radiation Science, 2015, 1(2): 021003.
[23] Xi L., Gao J., Xu L., et al., Study on heat transfer performance of steam-cooled ribbed channel using neural networks and genetic algorithms. International Journal of Heat and Mass Transfer, 2018, 127: 1110–1123.
[24] Xi L., Xu L., Gao J., et al., Numerical analysis and optimization on flow and heat transfer performance of a steam-cooled ribbed channel. Case Studies in Thermal Engineering, 2021, 28: 101442.
[25] Zhang G., Sundén B., Xie G., Combined experimental and numerical investigations on heat transfer augmentation in truncated ribbed channels designed by adopting fractal theory. International Communications in Heat and Mass Transfer, 2021, 121: 105080.
[26] El Maakoul A., Feddi K., Saadeddine S., et al., Performance enhancement of finned annulus using surface interruptions in double-pipe heat exchangers. Energy Conversion and Management, 2020, 210: 112710.
[27] Wang J., Guan Z., Gurgenci H., et al., A comprehensive review on numerical approaches to simulate heat transfer of turbulent supercritical CO2 flows. Numerical Heat Transfer, Part B: Fundamentals, 2020, 77(5): 349–400.
[28] Kim H.Y., Kim H.R., Kang D.J., et al., Experimental investigations on heat transfer to CO2 flowing upward in a narrow annulus at supercritical pressures. Nuclear Engineering and Technology, 2008, 40(2): 155–162.
[29] Li Y., Sun F., Xie G., et al., Improved thermal performance of cooling channels with truncated ribs for a scramjet combustor fueled by endothermic hydrocarbon. Applied Thermal Engineering, 2018, 142: 695–708.
[30] Li X., Meng J., Li Z., Roughness enhanced mechanism for turbulent convective heat transfer. International Journal of Heat and Mass Transfer, 2011, 54(9–10): 1775–1781.
[31] Wang Z., Guo Q., Wu Y., et al., Frictional resistance investigation of sCO2 and a semi-empirical friction factor correlation based on wall-of-the-law. International Journal of Heat and Mass Transfer, 2023, 217: 124634.
[32] Jing Q., Xie Y., Zhang D., Thermal hydraulic performance of printed circuit heat exchanger with various channel configurations and arc ribs for SCO2 Brayton cycle. International Journal of Heat and Mass Transfer, 2020, 150: 119272.
Options
文章导航

/

〈 〉

微信公众号

主办单位：中国科学院工程热物理研究所　 出版单位：科学出版社

版权所有© 2023 热科学学报