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Report No.

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

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

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. It was found that the liquid viscosity has dominant effect on the gas entrainment phenomena. It was pointed out that the flow behavior in the horizontal part of the outlet piping and in the upward flow piping were important for the gas entrainment rate prediction.



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