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Numerical Simulation Study on the Flow and Heat Transfer Characteristics of Subcooled N-Heptane Flow Boiling in a Vertical Pipe under External Radiation

Author

Listed:
  • Jinhu Lin

    (Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China)

  • Xiaohui Zhang

    (Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China)

  • Xiaoyan Huang

    (Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China)

  • Luyang Chen

    (Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China)

Abstract

In the top submerged lance (TSL) smelting process, flow boiling may occur in the lance’s inner pipe due to the heat coming from the furnace when liquid fuel is adopted. In the current study, a numerical simulation was carried out by coupling the Eulerian two-fluid model with the improved RPI wall boiling model to investigate the subcooled n-heptane flow boiling in the inner pipe. The effects of inlet velocity and pipe wall emissivity on two-phase flow and heat transfer are elucidated. The results show that, for pipes with inlet velocity ranging from 0.3 m·s −1 to 1.0 m·s −1 , an increase in inlet velocity leads to a lower void fraction near the outlet, as well as a lower average velocity and a lower average temperature of each phase. Meanwhile, the Onset of Nucleate Boiling (ONB) position approaches to the outlet, and the total pressure drop of the entire pipe reduces when the inlet velocity increases. However, the opposite trends appear when increasing the pipe wall emissivity. The maximum wall temperature corresponding to the critical heat flux (CHF) point is slightly affected by inlet velocity but significantly affected by pipe wall emissivity. The non-equilibrium effect and the specific components of pressure drop are also further investigated.

Suggested Citation

  • Jinhu Lin & Xiaohui Zhang & Xiaoyan Huang & Luyang Chen, 2022. "Numerical Simulation Study on the Flow and Heat Transfer Characteristics of Subcooled N-Heptane Flow Boiling in a Vertical Pipe under External Radiation," Energies, MDPI, vol. 15(10), pages 1-35, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3777-:d:820396
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    References listed on IDEAS

    as
    1. Guang Hu & Yue Ma & Qianfeng Liu, 2021. "Evaluation on Coupling of Wall Boiling and Population Balance Models for Vertical Gas-Liquid Subcooled Boiling Flow of First Loop of Nuclear Power Plant," Energies, MDPI, vol. 14(21), pages 1-29, November.
    2. Ernest Gyan Bediako & Petra Dančová & Tomáš Vít, 2022. "Experimental Study of Horizontal Flow Boiling Heat Transfer Coefficient and Pressure Drop of R134a from Subcooled Liquid Region to Superheated Vapor Region," Energies, MDPI, vol. 15(3), pages 1-24, January.
    3. Jinfeng Wang & Shenglin Zhu & Jing Xie, 2021. "Investigation of R290 Flow Boiling Heat Transfer and Exergy Loss in a Double-Concentric Pipe Based on CFD," Energies, MDPI, vol. 14(21), pages 1-19, November.
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