1320 水平注入高密度水溶液の垂直上昇水流れ中における混合に関する数値解析

概要

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Fundamental experiments on the mixing of horizontally-injected high-density calcium-chloride (CaCl_2) solution in vertically-upward water flow were already performed in order to provide basic data on the mixing of boric acid solution from SLCS in a reactor lower plenum during an ATWS of a BWR. In this study, numerical calculations are performed mainly to predict the boundaries between complete and incomplete mixing (entrainment) observed in the experiments. In the complete mixing, the injected high-density solution is mixed (entrained) completely into the vertically-upward water flow. On the other hand, in the incompletes mixing, the high-density solution is partly falls down even in the upward water flow. A continuity equation and momentum equations for the total fluid, and a mass transfer equation for the solute are solved by the finite volume method. The numerical calculations have predicted nearly the boundary water flow rates between complete and incomplete mixing obtained in the experiments.
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