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Modelling of Liquid Film Flow in Annuli
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2014 (English)In: Journal of Power Technologies, ISSN 2083-4187, E-ISSN 2083-4195, Vol. 94, 8-15 p.Article in journal (Refereed) Published
Abstract [en]

One of the challenges in thermal-hydraulic analyses of BWRs is correct prediction of dryout occurrence in fuel assemblies. In practical applications the critical powers in fuel assemblies are found from correlations that are based on experimental data. The drawback of this approach is that correlations are valid only for these fuel assemblies on which the experiments have been conducted. Other restrictive factors are the limited ranges of experimental working conditions including pressure, mass flux and axial power distributions. To overcome the above-mentioned limitations, several different approaches have been proposed to predict the dryout occurrence. One of them is to employ a phenomenological model of annular flow, in which the mass transfer between the liquid film and the gas core is based on entrainment and deposition correlations. Most of these correlations are derived from water-air flows in vertical tubes and their applicability to other geometries in general, and rod-bundles in particular, should be analysed. This paper presents an analysis of the entrainment rate in vertical annuli. Using the standard approach to calculate the entrainment rate, one can demonstrate that the results deviate from measurements. It has been shown that modifying the entrainment correlation based on data obtained in the annulus geometry leads to an essential improvement in the predictive capability of the phenomenological model of annular two-phase flow.

Place, publisher, year, edition, pages
2014. Vol. 94, 8-15 p.
Keyword [en]
Entrainment rate, Annular flow, Dryout, Annular geometry, BWR
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-163563OAI: diva2:801115

QC 20150410

Available from: 2015-04-08 Created: 2015-04-08 Last updated: 2015-04-10Bibliographically approved

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