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Analysis of reacting gas jets in liquid pools using the SERAPHIM program

Uchibori, Akihiro ; Watanabe, Akira*; Ohshima, Hiroyuki

A SERAPHIM program has been developed to calculate multicomponent multiphase flow involving sodium-water chemical reaction under a tube failure accident in a steam generator of sodium-cooled commercial fast reactors. In this study, the experiment on supersonic chlorine jet into Na-NaCl mixture was analyzed to validate applicability of the numerical models to reactive multiphase flows. The program uses a multi-fluid model and a HSMAC method modified for compressible multiphase flows. A mass generation rate by chemical reaction is evaluated from the assumption that progress of chemical reaction is limited by a mass flow rate of a reactant gas toward a liquid surface. Numerical results showed that the injected gas disappeared at a certain height. The calculated plume length showed good agreement with the experimental data against three different experimental conditions. The proposed numerical models were found to be applicable to multiphase flow with chemical reaction.

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