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Numerical Study on the Gravity Effect on Heat Transfer of Supercritical CO 2 in a Vertical Tube

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  • Xiaojing Zhu

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China)

  • Ruizeng Zhang

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China)

  • Xiao Yu

    (Shenyang Aeroengine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China)

  • Maoguo Cao

    (Shenyang Aeroengine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China)

  • Yongxiang Ren

    (Shenyang Aeroengine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China)

Abstract

The effects of gravity on the heat transfer performance of supercritical CO 2 flowing within a vertical tube with a diameter of 4.75 mm are numerically studied in this paper. The main objectives are to comprehensively investigate the action of gravity and buoyancy on the supercritical heat transfer. An effective numerical method, which employs a modified Shear Stress Transfer k - ω model (SST k - ω ), is applied at various gravity conditions. It is found that, for both upward and downward flows, the heat transfer of supercritical CO 2 is improved with increased gravity magnitude. The effect of gravity on heat transfer are more pronounced under a low mass flux condition than that under a high mass flux condition and it is closely related to the variations of thermal properties. For the upward flow, the increased gravity magnitude accelerates the near wall fluid and creates a classic “M-shaped” radial velocity distribution. For the downward flow, the increased gravity magnitude decelerates the near wall fluid and creates a parabola-like radial velocity distribution. On one hand, the turbulent kinetic energies of both the upward and downward flows are enhanced as the gravity magnitude increases, which benefits heat transfer dominated by turbulent eddy diffusion. On the other hand, high-density fluid with high thermal conductivity occupies the near wall region as the gravity magnitude increases, which benefits heat transfer dominated by molecular diffusion. The results might provide some instructive advice to improve the design and operation safety of heat exchanger at various gravity conditions.

Suggested Citation

  • Xiaojing Zhu & Ruizeng Zhang & Xiao Yu & Maoguo Cao & Yongxiang Ren, 2020. "Numerical Study on the Gravity Effect on Heat Transfer of Supercritical CO 2 in a Vertical Tube," Energies, MDPI, vol. 13(13), pages 1-20, July.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3502-:d:381236
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    References listed on IDEAS

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    1. Du, Xin & Lv, Zhihao & Yu, Xiao & Cao, Maoguo & Zhou, Jianjun & Ren, Yongxiang & Qiu, Qinggang & Zhu, Xiaojing, 2020. "Heat transfer of supercritical CO2 in vertical round tube: A considerate turbulent Prandtl number modification," Energy, Elsevier, vol. 192(C).
    2. Li, Zhouhang & Tang, Guoli & Wu, Yuxin & Zhai, Yuling & Xu, Jianxin & Wang, Hua & Lu, Junfu, 2016. "Improved gas heaters for supercritical CO2 Rankine cycles: Considerations on forced and mixed convection heat transfer enhancement," Applied Energy, Elsevier, vol. 178(C), pages 126-141.
    3. Li, Xinyi & Ma, Ting & Liu, Jun & Zhang, Hao & Wang, Qiuwang, 2018. "Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method," Applied Energy, Elsevier, vol. 222(C), pages 92-103.
    4. Zhang, Shijie & Xu, Xiaoxiao & Liu, Chao & Liu, Xinxin & Zhang, Yadong & Dang, Chaobin, 2019. "The heat transfer of supercritical CO2 in helically coiled tube: Trade-off between curvature and buoyancy effect," Energy, Elsevier, vol. 176(C), pages 765-777.
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    Cited by:

    1. Jianfei Tong & Lingbo Zhu & Yiping Lu & Tianjiao Liang & Youlian Lu & Songlin Wang & Chaoju Yu & Shikui Dong & Heping Tan, 2021. "Heat Transfer Analysis in Supercritical Hydrogen of Decoupled Poisoned Hydrogen Moderator with Non-Uniform Heat Source of Chinese Spallation Neutron Source," Energies, MDPI, vol. 14(15), pages 1-17, July.

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