Local parameters of air–water two-phase flow at a vertical T-junction

Monrós-Andreu, G.; Martínez‐Cuenca, Raúl; Torró, S.; Chiva, S.

doi:10.1016/j.nucengdes.2016.08.033

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…The experimental data used in this paper are based on the facility described in Monrós-Andreu et al [6,7] in a pipe of diameter 52 mm and length 5500 mm with a sparger to inject the air flow. Hi-Tech) was used to adjust and measure the gas flow rate.…”

Section: Description Of the Experimental Facility And Techniquesmentioning

confidence: 99%

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

Peña-Monferrer

Gómez-Zarzuela

Chiva

et al. 2018

Science and Technology of Nuclear Installations

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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 driftvelocity 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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Section: Description Of the Experimental Facility And Techniquesmentioning

confidence: 99%

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

Peña-Monferrer

Gómez-Zarzuela

Chiva

et al. 2018

Science and Technology of Nuclear Installations

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“…In addition to these experiments, we presented in this work experimental results based on the facility described in Monrós-Andreu et al 2013and Monrós-Andreu et al (2017) in a pipe of diameter 52 mm and length 5500 mm. A sparger to inject the air flow is used.…”

Section: Experimental Datasets Selectedmentioning

confidence: 99%

Computational fluid dynamics multiscale modelling of bubbly flow. A critical study and new developments on volume of fluid, discrete element and two-fluid methods

Peña-Monferrer¹

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The study and modelling of two-phase flow remains a challenge that requires exploring the physical phenomena from different spatial and temporal resolution levels, even for the simplest regime such as bubbly flow. Computational Fluid Dynamics (CFD) is a widespread and promising tool for modelling, but nowadays, there is no single approach or method to predict the dynamics of these systems providing enough precision of the results. The inherent difficulties of the events occurring in this flow, mainly those related with the interface between phases, makes that low or intermediate resolution level approaches as system codes (RE-LAP, TRACE, etc.) or 3D TFM (Two-Fluid Model) have significant issues to reproduce acceptable results, unless well-known scenarios and global values are considered. Instead, methods based on high resolution level such as Interfacial Tracking Method (ITM) or Volume Of Fluid (VOF) require a high computational effort that makes unfeasible its use in complex systems. Regarding the simulations with system codes as RELAP or TRACE, I am grateful to Prof. Dr. Rafael Miró and Consuelo Gómez-Zarzuela from the UPV for the help in the simulations and developments performed. Many people have contributed either directly or indirectly to this study. Fortunately, the list is so long that I can't write it down all, but I am grateful to my colleges in the Department of Chemical and Nuclear Engineering at UPV, especially toÁlvaro Bernal, Carles Mesado and Nicolás Olmo. And, of course, thanks to all my colleges in the Chiva's group at UJI. Furthermore, I have to give a special 9 thanks to my parents, brother, sister-in-law (also to the little Lucas) and to my girlfriend Dr. Carmen Díaz for her love. Finally, I hope that readers will find this work interesting and I should like to conclude begging that the defects in a subject so difficult be not so much reprehended as kindly supplied, and investigated by new endeavours of my readers.

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“…The technique used to obtain the data was Laser Doppler Anemometry (LDA), which is an optical technique to measure velocity and turbulence distribution in both free and internal flows. Details of the experiment and the methodology followed can be found in Monrós-Andreu et al, 2013 andMonrós-Andreu et al, 2017. The experiment consisted in a water-air fluid running upwards through the pipe.…”

Section: Pw-serie Experimentsmentioning

confidence: 99%

Development and assessment of a one-dimensional CFD solver for boiling flows in bubbly regimes

Quel¹

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First of all, I would like to thank my director, Prof. Rafael Miró for giving me this opportunity and for his suggestions and help during the way. I am also very grateful to Dr. Sergio Chiva and Dr. Carlos Peña-Monferrer for their guidance during last stage of this thesis. Without our invaluable meetings this thesis would not be complete. This adventure also gave me the opportunity of learning from the best research groups abroad, and I would like to thank my advisors, Prof. Analissa Manera and Prof. Maria Avramova for their warm welcome and their always productive meetings and suggestions. I cannot forget the inestimable assistance of Dr. Agustín Abarca, specially during the two months that I stayed in Raleigh.My colleagues in the Department of Chemical and Nuclear Engineering at UPV, who with I shared pains and joys of the PhD have been a fundamental part these years. Special thanks to my already friends Antonella, María, Amanda and Sergio, but I cannot forget of Patricio, Sete, Javier or Aina. These are only a part of the amazing PhD student group that this department has.And last, but no least, to my family, who always supported me and believed in me even when I did not. And to you, Rubén, who suffered when I suffered and laughed when I laughed. You are the only reason this thesis is finished.

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Local parameters of air–water two-phase flow at a vertical T-junction

Cited by 10 publications

References 28 publications

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

On the One-Dimensional Modeling of Vertical Upward Bubbly Flow

Computational fluid dynamics multiscale modelling of bubbly flow. A critical study and new developments on volume of fluid, discrete element and two-fluid methods

Development and assessment of a one-dimensional CFD solver for boiling flows in bubbly regimes

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