On the One-Dimensional Modeling of Vertical Upward Bubbly Flow
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Altres documents de l'autoria: Peña Monferrer, Carlos; Gómez Zarzuela, C.; chiva, sergio; Miró, R.; Verdú, Gumersindo; Muñoz-Cobo, Jose-Luis
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7035
comunitat-uji-handle3:10234/8617
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On the One-Dimensional Modeling of Vertical Upward Bubbly FlowAutoria
Data de publicació
2018Editor
Hindawi Publishing CorporationISSN
1687-6075; 1687-6083Cita bibliogràfica
PEÑA-MONFERRER, C., et al. On the One-Dimensional Modeling of Vertical Upward Bubbly Flow. Science and Technology of Nuclear Installations, 2018, Article ID 2153019, 10 pagesTipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://www.hindawi.com/journals/stni/2018/2153019/abs/Versió
info:eu-repo/semantics/publishedVersionResum
The one-dimensional two-fluid model approach has been traditionally used in thermal-hydraulics codes for the analysis of transients and accidents in water–cooled nuclear power plants. This paper investigates the ... [+]
The one-dimensional two-fluid model approach has been traditionally used in thermal-hydraulics codes for the analysis of transients and accidents in water–cooled nuclear power plants. This paper investigates the performance of RELAP5/MOD3 predicting vertical upward bubbly flow at low velocity conditions. For bubbly flow and vertical pipes, this code applies the drift-velocity approach, showing important discrepancies with the experiments compared. Then, we use a classical formulation of the drag coefficient approach to evaluate the performance of both approaches. This is based on the critical Weber criteria and includes several assumptions for the calculation of the interfacial area and bubble size that are evaluated in this work. A more accurate drag coefficient approach is proposed and implemented in RELAP5/MOD3. Instead of using the Weber criteria, the bubble size distribution is directly considered. This allows the calculation of the interfacial area directly from the definition of Sauter mean diameter of a distribution. The results show that only the proposed approach was able to predict all the flow characteristics, in particular the bubble size and interfacial area concentration. Finally, the computational results are analyzed and validated with cross-section area average measurements of void fraction, dispersed phase velocity, bubble size, and interfacial area concentration. [-]
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Science and Technology of Nuclear Installations, 2018, Article ID 2153019, 10 pagesProyecto de investigación
The authors sincerely thank the “Plan Nacional de I+D+i” for funding the Projects MODEXFLAT ENE2013-48565-C2-1- P, ENE2013-48565-C2-2-P, andNUC-MULTPHYS ENE2012- 34585.Drets d'accés
info:eu-repo/semantics/openAccess
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Except where otherwise noted, this item's license is described as Copyright © 2018 C. Peña-Monferrer et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.