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Two phase flow redistribution in a two-layered porous medium with contrasting permeability

Swaidan, Ali and Fichot, Florian and Quintard, Michel Two phase flow redistribution in a two-layered porous medium with contrasting permeability. (2017) In: 7th International Symposium on Advances in Computational Heat Transfer, 28 May 2017 - 2 June 2017 (Napoli, Italy).

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Official URL: http://doi.org/10.1615/ICHMT.2017.460

Abstract

Motivated to investigate debris bed coolability in a damaged nuclear reactor core by bottom re ooding, this paper studies the physical situation involving injection of water into a superheated particle bed leading to high velocity ow of steam. The particle bed is composed of two cylindrical concentric parts and stratified vertically. One of the particular features of the studied configuration is that quenching of the superheated particles generates a strong ow of steam which may create a vertical pressure gradient leading the water in the lateral, more permeable medium, to ow faster than the injection velocity and consequently reducing the efficiency of cooling. The aim is to propose an analytical model to predict the behavior of water entrainment in the lateral layer (bypass) of larger permeability and porosity. This model computes the quench front velocity, water-to-steam conversion ratio, and the velocity of water in the bypass. It provides good qualitative and quantitative results for the two-phase ow redistribution as compared to experimental data. It also has several advantages as it allows: performing fast evaluations of the efficiency of cooling, upscaling to reactor-scale straightforwardly, and performing sensitivity studies on the physical properties of the particle beds and the fluid, and the variations of the momentum equations. For instance, it showed that the Generalized Darcy law was not sufficient to obtain acceptable evaluations whereas considering non-zero cross-terms in the Darcy Forchheimer equation by including an interfacial friction law succeeds in obtaining better results.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to ICHMT Digital Library : http://www.dl.begellhouse.com/references/1bb331655c289a0a.html Thanks to 7th International Symposium on Advances in Computational Heat Transfer : http://www.ichmt.org/site/4/cht-17
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut de Radioprotection et de Sûreté Nucléaire - IRSN (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:24 May 2018 13:57

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