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Numerical Simulation on Two-Phase Ejector with Non-Condensable Gas

Author

Listed:
  • Yinghua Chai

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

  • Yuansheng Lin

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

  • Qi Xiao

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

  • Chonghai Huang

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

  • Hanbing Ke

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

  • Bangming Li

    (Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
    Wuhan Second Ship Design and Research Institute, Wuhan 430205, China)

Abstract

The two-phase ejector is a simple and compact pressure boosting device and widely used in ejector steam-generator water feeding systems and core emergency cooling systems. The direct contact condensation of water and steam is the key process of a two-phase ejector. Usually, the high-temperature and high-pressure steam will inevitably induce non-condensable gases. The existence of non-condensable gases will reduce the condensation heat transfer rate between steam and water, and harm the equipment. This study carried out 3D numerical simulations of a two-phase ejector based on an inhomogeneous multiphase model. The steam inlet pressure and the non-condensable gas mass fraction rang in 0.6–2.9 MPa and 1–10%, respectively. The heat and mass transfer characteristics were analyzed under different conditions. The results show that the heat transfer coefficient and plume penetration length increased with the steam inlet pressure. Non-condensable gas prevents direct contact condensation between the steam and water. The non-condensable gas mass fraction rises from 1% to 10%, the heat transfer between steam and water deteriorates, and leads to a lower heat transfer coefficient.

Suggested Citation

  • Yinghua Chai & Yuansheng Lin & Qi Xiao & Chonghai Huang & Hanbing Ke & Bangming Li, 2024. "Numerical Simulation on Two-Phase Ejector with Non-Condensable Gas," Energies, MDPI, vol. 17(6), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1341-:d:1354972
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    References listed on IDEAS

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    1. Carlo Cravero & Davide De Domenico & Davide Marsano, 2023. "Uncertainty Quantification Analysis of Exhaust Gas Plume in a Crosswind," Energies, MDPI, vol. 16(8), pages 1-22, April.
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