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Experimental and Computational Multiphase Flow 2023, 5(4): 365-380 https://doi.org/10.1007/s42757-022-0149-3
Research Article | Open Access | Issue | Published: 11 April 2023

Euler–Euler CFD simulation of high velocity gas injection at pool scrubbing conditions

Show Author's Information Shiwang Li1,  Pavel Apanasevich2,  Dirk Lucas1,  Yixiang Liao1( )
Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
Hydrograv GmbH, August-Bebel-Straße 48, 01219 Dresden, Germany
Keywords:
OpenFOAM, two-fluid model, hydrodynamics, decontamination factor, pool scrubbing
Cite this article:
Li S, Apanasevich P, Lucas D, et al. Euler–Euler CFD simulation of high velocity gas injection at pool scrubbing conditions. Experimental and Computational Multiphase Flow, 2023, 5(4): 365-380. https://doi.org/10.1007/s42757-022-0149-3
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Abstract Full text About this article

Pressure relief by blowdown is one of the most important measures to prevent excessive pressures in the primary circuit or containment in severe nuclear accidents. Pool scrubbing can significantly reduce the release of radioactive materials, e.g., aerosols, to the environment during the pressure relief. The decontamination factor indicating the particle retention efficiency depends, among other factors, on the hydrodynamic conditions of the gas–liquid two-phase flow inside the pool. In the present work, the hydrodynamics in two typical pool scrubbing experiments is investigated with the two-fluid model, and the influence of some key factors including bubble diameter, nozzle submergence as well as interaction models are analysed. One case is a rectangular pool and the other is a cylindrical column, and their injection Weber number is around 2×103 and 4×105, respectively. The numerical results show that as the distance from the nozzle exit increases, the void fraction and velocity field expand from the central region, where the nozzle is located, to the whole cross section. The profile and its development depends largely on the bubble size and the interaction force model. It reveals that in the monodisperse simulation, the tuning of bubble diameter is necessary for achieving good agreement, although it is difficult for high velocity gas injection. More information is required to properly describe the bubble size distribution as well as its evolution in pool scrubbing conditions. Furthermore, the experimental data show clear drag reduction in the bubble swarm generated by the gas jet, and the mechanism and model improvement possibilities need to be investigated.


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Euler–Euler CFD simulation of high velocity gas injection at pool scrubbing conditions

Show Author's information Shiwang Li1, Pavel Apanasevich2, Dirk Lucas1, Yixiang Liao1( )
Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
Hydrograv GmbH, August-Bebel-Straße 48, 01219 Dresden, Germany

Abstract

Pressure relief by blowdown is one of the most important measures to prevent excessive pressures in the primary circuit or containment in severe nuclear accidents. Pool scrubbing can significantly reduce the release of radioactive materials, e.g., aerosols, to the environment during the pressure relief. The decontamination factor indicating the particle retention efficiency depends, among other factors, on the hydrodynamic conditions of the gas–liquid two-phase flow inside the pool. In the present work, the hydrodynamics in two typical pool scrubbing experiments is investigated with the two-fluid model, and the influence of some key factors including bubble diameter, nozzle submergence as well as interaction models are analysed. One case is a rectangular pool and the other is a cylindrical column, and their injection Weber number is around 2×103 and 4×105, respectively. The numerical results show that as the distance from the nozzle exit increases, the void fraction and velocity field expand from the central region, where the nozzle is located, to the whole cross section. The profile and its development depends largely on the bubble size and the interaction force model. It reveals that in the monodisperse simulation, the tuning of bubble diameter is necessary for achieving good agreement, although it is difficult for high velocity gas injection. More information is required to properly describe the bubble size distribution as well as its evolution in pool scrubbing conditions. Furthermore, the experimental data show clear drag reduction in the bubble swarm generated by the gas jet, and the mechanism and model improvement possibilities need to be investigated.

Keywords: OpenFOAM, two-fluid model, hydrodynamics, decontamination factor, pool scrubbing

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Publication history

Received: 20 April 2022
Revised: 12 September 2022
Accepted: 24 November 2022
Published: 11 April 2023
Issue date: December 2023

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© The Author(s) 2023

Acknowledgements

The author Shiwang Li is supported by the Chinese Scholarship Council (CSC).

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