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Effect of physical properties on gas entrainment rate from free surface by vortex

自由液面渦によるガス巻込み量に対する流体物性の影響

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

研究開発段階にあるナトリウム冷却高速炉では、1次冷却材中へのカバーガス巻込みが1つの重要な評価課題となっている。著者らは、円筒容器内に形成した自由液面渦に伴う液面くぼみによってガス巻込みを発生させ、高速度カメラを用いて巻込み量の可視化計測を行っている。本研究では、流体物性が巻込み量に与える影響を評価するため、従来研究で用いた水に加え、ケロシンとシリコンオイルを用いた実験を行った結果について報告する。

A sodium-cooled fast breeder reactor is now at the developing 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. Liquid flowed into a cylindrical vessel from a wall tangentially. Swirl flow was formed in the vessel, and then liquid drained from the bottom outlet of the vessel. A hollow vortex was formed on the free surface in the test vessel. 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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