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Improvement of gas entrainment prediction method; Introduction of surface tension effect

ガス巻込み予測手法の高度化; 表面張力効果の導入

伊藤 啓; 堺 公明; 江口 譲*; 文字 秀明*; 大島 宏之; 内堀 昭寛; Xu, Y.*

Ito, Kei; Sakai, Takaaki; Eguchi, Yuzuru*; Monji, Hideaki*; Ohshima, Hiroyuki; Uchibori, Akihiro; Xu, Y.*

ナトリウム冷却大型炉(JSFR)の設計成立性を判断するため、ガス巻込み発生予測手法の開発を行っている。本論文では、ガスコア長さの評価精度向上のため、重力,遠心力及び表面張力の力学的釣合い式に基づいて表面張力効果の導入を行った結果について述べる。高精度化した手法の検証として単純体系における実験を対象とした評価を行った結果、表面張力効果によってガスコア長さが減少し、実験結果とよく一致した。また、温度や界面活性剤濃度を変化させた実験結果についても、高精度手法を用いることで再現できることを明らかにした。

A gas entrainment (GE) prediction method has been developed to establish design criteria for the large-scale sodium-cooled fast reactor (JSFR) systems. In this paper, the evaluation accuracy of gas core lengths is improved by introducing the surface tension effects into the prototype GE prediction method. For the improvement, the mechanical balance between gravitational, centrifugal, and surface tension forces is considered. The improved GE prediction method is validated by analyzing the gas core lengths observed in simple experiments. Results show that the analytical gas core lengths calculated by the improved GE prediction method become shorter in comparison to the prototype GE prediction method, and are in good agreement with the experimental data. In addition, the experimental data under different temperature and surfactant concentration conditions are reproduced by the improved GE prediction method.

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