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Two-fluid equation for two-phase flow considering change in volume porosity.

Authors :
Lee, Jong Hyuk
Kim, Byoung Jae
Lee, Seung Wook
Kim, Kyung Doo
Source :
Nuclear Engineering & Design. Jun2019, Vol. 347, p1-9. 9p.
Publication Year :
2019

Abstract

Highlights • Two-fluid equations considering spatial/temporal variation in flow area are developed. • These equations are verified via conceptual problems using the SPACE code. • The simulations show physically valid results in terms of mass balance and velocity. Abstract During loss-of-coolant accidents, nuclear fuels may undergo swelling and ballooning owing to fuel deformation. This can affect the cooling performance because of change in the flow area. In this regard, numerous studies have been conducted to investigate the cooling performance of partially blocked rod bundles. However, the cases in which the coolant flow areas vary with time have not been considered. In this regard, the purpose of this study is to develop and verify the two-fluid equations applicable to a channel whose flow area varies spatially and temporally. Toward this end, we derive volume-averaged two-fluid equations including volume porosity, which may vary spatially and temporally. To verify the developed equations, we perform one-dimensional simulations of simple conceptual problems for single-phase and two-phase flows using the SPACE code. Our simulation results exhibit an improvement over the conventional approach in terms of the mass conservation and velocity aspects. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00295493
Volume :
347
Database :
Academic Search Index
Journal :
Nuclear Engineering & Design
Publication Type :
Academic Journal
Accession number :
135929530
Full Text :
https://doi.org/10.1016/j.nucengdes.2019.03.018