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Verification of Discontinuous Random Walk Lagrangian Particle Tracking as a Tool to Model Deposition in Annular Flow
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2009 (English)In: Proceedings of the 17th International Conference on Nuclear Engineering ICONE17 July 12-16, 2009, Brussels, Belgium ICONE17-75297, Brussels, Belgium, 2009, 311-319 p.Conference paper, Published paper (Refereed)
Abstract [en]

A verification of the applicability of the discontinuous random walk (DWR) Lagrangian Particle Tracking (LPT) model to calculate deposition in annular two-phase flow has been conducted. The comparison of simulation results to experimental data of deposition of mono-sized droplets shows that the model follows the correct trend in inertiamoderated regime, but is un-reliable in diffusion-impaction deposition regime. The comparison to other experimental studies of annular flow of different density ratios between the two phases reveals that the density ratio is incorrectly incorporated into the model, since the experimental trend is reversed. It can be concluded that the applicability of DWR LPT model for deposition calculation in steam-water flow at BWR conditions cannot be validated by solely comparing the simulation results to air-water experimental data.

Place, publisher, year, edition, pages
Brussels, Belgium, 2009. 311-319 p.
Series
International Conference on Nuclear Engineering, Proceedings, ICONE, 3
Keyword [en]
Air-water, Annular flows, Annular two-phase flow, Density ratio, Deposition regimes, Experimental data, Experimental studies, In-diffusion, Lagrangian particle tracking, Mono-sized, Random Walk, Simulation result, Steam-water flows, Two phasis
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-9909DOI: 10.1115/ICONE17-75297ISI: 000282466600038Scopus ID: 2-s2.0-77952821861ISBN: 978-0-7918-4353-6 (print)OAI: oai:DiVA.org:kth-9909DiVA: diva2:158045
Conference
the 17th International Conference on Nuclear Engineering ICONE17 July 12-16, 2009, Brussels, Belgium ICONE17-75297
Note
QC 20101007. Tidigare titel: "LAGRANGIAN PARTICLE TRACKING AS A TOOL FOR DEPOSITION MODELING IN ANNULAR FLOW".Available from: 2009-02-18 Created: 2009-01-29 Last updated: 2011-01-31Bibliographically approved
In thesis
1. Experimental Study and Modelling of Spacer Grid Influence on Flow in Nuclear Fuel Assemblies
Open this publication in new window or tab >>Experimental Study and Modelling of Spacer Grid Influence on Flow in Nuclear Fuel Assemblies
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The work is focused on experimental study and modelling of spacer grid influence on single- and two-phase flow. In the experimental study a mock-up of a realistic fuel bundle with five spacer grids of thin plate spring construction was investigated. A special pressure measuring technique was used to measure pressure distribution inside the spacer. Five pressure taps were drilled in one of the rods, which could exchange position with other rods, in this way providing a large degree of freedom. Laser Doppler Velocimetry was used to measure mean local axial velocity and its fluctuating component upstream and downstream of the spacer in several subchannels with differing spacer part. The experimental study revealed an interesting behaviour. Subchannels from the interior part of the bundle display a different effect on the flow downstream of the spacer compared to subchannels close to the box wall, even if the spacer part is the same. This behaviour is not reflected in modern correlations. The modelling part, first, consisted in comparing the present experimental data to Computational Fluid Dynamics calculations. It was shown that stand-alone subchannel models could predict the local velocity, but are unreliable in prediction of turbulence enhancement due to spacer. The second part of the modelling consisted in developing a deposition model for increase due to spacer. In this study Lagrangian Particle Tracking (LPT) coupled to Discrete Random Walk (DRW) technique was used to model droplet movements through turbulent flow. The LPT technique has an advantage to model the influence of turbulence structure effect on droplet deposition, in this way presenting a generalized model in view of spacer geometry change. The verification of the applicability of LPT DRW method to model deposition in annular flow at Boiling Water Reactor conditions proved that the method is unreliable in its present state. The model calculations compare reasonably well to air-water deposition data, but display a wrong trend if the fluids have a different density ratio than air-water.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2009. 40 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:02
Keyword
spacer grid influence, annular flow, deposition, Lagrangian Particle Tracking
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-9983 (URN)978-91-7415-229-6 (ISBN)
Presentation
2009-02-26, FA31, Roslagstullsbacken 21, Albanova University Centre, 10:00 (English)
Opponent
Supervisors
Available from: 2009-02-18 Created: 2009-02-18 Last updated: 2012-11-26Bibliographically approved

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Anglart, Henryk

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