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渦によるガス巻込み現象の観察とガス巻込み気泡量の定量評価

Observation of gas entrainment from free surface by vortex and measurement of entrained gas flow rate

大手 直介*; 小泉 安郎*; 上出 英樹 ; 大野 修司  ; 伊藤 啓

Ote, Naosuke*; Koizumi, Yasuo*; Kamide, Hideki; Ohno, Shuji; Ito, Kei

ナトリウム冷却高速炉の安全上の課題の1つであるガス巻込み現象に関する研究の一環として、ガス巻込み流量を計測する実験を実施した。実験においては、液面上に形成されるくぼみ渦によってガスが巻込まれる様子を高速度ビデオによって撮影し、ガス巻込み流量と液相流量の関係を計測した。また、ケロシンやシリコンオイルを用いた実験を行い、物性を変化させた影響について評価した。

A sodium-cooled fast breeder reactor is now at the development stage in Japan. One concern for safety is cover gas entrainment into the sodium coolant. The gas entrainment rate into liquid by the vortex formed on the free surface was examined experimentally. A hollow vortex was formed on the free surface in the test vessel. The air was entrained under the free surface of the vortex and carried away from the bottom of the vessel. The flow state of the gas entrainment was visually observed by using a high speed video camera. The gas entrainment rate into liquid was measured. In the previous study, test fluid was water. Kerosene and 20 cSt silicone oil were newly introduced as the test fluid to examine the effect of the physical properties on the gas entrainment phenomena.

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