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Numerical Study of Bubble Coalescence and Breakup in the Reactor Fuel Channel with a Vaned Grid

Author

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  • Tenglong Cong

    (Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, 145 Nantong St, Harbin 150001, China)

  • Xiang Zhang

    (Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, 145 Nantong St, Harbin 150001, China)

Abstract

The characteristics of bubbles of different sizes in fuel assembly are vital to two-phase flow resistance and heat transfer capacity. However, due to the swirl flow caused by the mixing vane, bubbles can crowd at the heated surface, which may anticipate the occurrence of departure from nucleation boiling. In the current work, the adiabatic two-phase flow in a simplified fuel assembly was analyzed by using the Eulerian two-fluid model and the MUSIG (MUltiple SIze Group) model. This computational domain consists of two coolant channels and two sets of vaned spacers, with three sets of periodic boundary conditions at the side faces of the domain. The distributions of vapor phase and bubble diameters were obtained, based on which the effects of mixing vanes on the bubble characteristics were analyzed. Vapor phase crowded at the rod surface in the higher inlet vapor fraction case, but crowded in the channel center in the lower inlet vapor fraction cases. This work can be used as a reference for the design of mixing vanes to avoid the anticipation of departure of nucleation boiling that may be caused by unreasonable design.

Suggested Citation

  • Tenglong Cong & Xiang Zhang, 2018. "Numerical Study of Bubble Coalescence and Breakup in the Reactor Fuel Channel with a Vaned Grid," Energies, MDPI, vol. 11(1), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:1:p:256-:d:127988
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    Citations

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    Cited by:

    1. Pavel Lobanov & Maksim Pakhomov & Viktor Terekhov, 2019. "Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion," Energies, MDPI, vol. 12(14), pages 1-18, July.
    2. Fangyang Yuan & Zhengwei Cui & Jianzhong Lin, 2020. "Experimental and Numerical Study on Flow Resistance and Bubble Transport in a Helical Static Mixer," Energies, MDPI, vol. 13(5), pages 1-20, March.
    3. Alfredo Iranzo & Francisco Javier Pino & José Guerra & Francisco Bernal & Nicasio García, 2018. "Cooling Process Analysis of a 5-Drum System for Radioactive Waste Processing," Energies, MDPI, vol. 11(10), pages 1-25, October.

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