Impact of population balance model on subcooled flow boiling simulation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00368673" target="_blank" >RIV/68407700:21340/23:00368673 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.13182/NURETH20-40085" target="_blank" >https://doi.org/10.13182/NURETH20-40085</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13182/NURETH20-40085" target="_blank" >10.13182/NURETH20-40085</a>

Result language

angličtina

Original language name

Impact of population balance model on subcooled flow boiling simulation

Original language description

This paper presents two modifications of Eulerian CFD (Computational Fluid Dynamics) model to predict subcooled boiling flows in the DEBORA experiment, the conditions of Freon-R12 corresponding to those in PWRs (Pressurized Water Reactors). Literature study reveals that the experimental data, which were used for CFD validation, were limited to low void fraction cases (< 0.3), and the cases with high void were not presented. This work focuses primarily on having good agreement with these cases of high void fraction, which is achieved by modifying the lift force coefficients in the zero-closure model developed by Baglietto’s group. In addition, low void fraction cases were also evaluated in order to show the applicability of our model to wide range of void fraction. Different combinations of closure relations were tested to conform the results of the DEBORA experiment. The first Model is built on a complex transport equation for interfacial area concentration with a simple algebraic equation for bubble diameter calculation. The second one includes a population balance model (PBM) for bubble diameter calculation, and also a new modification bubble departure diameter model is presented. A homogeneous PBM is introduced to accurately predict large size distribution of the dispersed vapor bubbles. To better implement PBM, sensitivity analyses need to be performed to select the suitable coalescence and breakage models and factors. Different correlations for nucleation site density are used in both Models.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10700 - Other natural sciences

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20)

ISBN

978-0-89448-793-4

ISSN

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e-ISSN

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Number of pages

13

Pages from-to

212-224

Publisher name

American Nuclear Society, Inc.

Place of publication

Illinois

Event location

Washington DC

Event date

Aug 20, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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