Numerical methodology of sodium-water reaction with multiphase flow analysis

Takashi Takata, Akira Yamaguchi, Kaori Fukuzawa, Kiyoshi Matsubara

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

A numerical methodology of sodium-water reaction (SWR) and a coupling method of SWR and multiphase flow analysis are proposed. Two SWR models are considered. One is a surface reaction model, which assumes that water vapor reacts with liquid sodium at the gas-liquid interface. The surface reaction is likely to be dominant in the initial phase of SWR. The analogy between mass and heat transfers is assumed to evaluate the diffusion-controlled reaction rate. The other is a gas-phase reaction model. If chemical reaction heating due to the surface reaction is large enough to vaporize the liquid sodium, it turns over in the gas-phase reaction. In the gas-phase reaction, water vapor reacts with sodium gas. The reaction mechanisms in the gas-phase reaction are investigated using an ab initia molecular orbital method. The reaction rate of the gas-phase reaction described by the Arrhenius law is obtained from the transition-state theory or the capture theory. The reaction models are employed in a compressible multi-fluid and one-pressure model using the Highly Simplified Marker and Cell method for multiphase flow analysis. As numerical examples, surface reaction with multiphase flow analysis and simplified gas-phase reaction analyses are carried out. It is confirmed that the present method is practically applicable to the coupling phenomena of SWR and multiphase flow.

Original languageEnglish
Pages (from-to)221-236
Number of pages16
JournalNuclear Science and Engineering
Volume150
Issue number2
DOIs
Publication statusPublished - 2005 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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