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Journal Articles

Effect of physical properties on gas entrainment rate from free surface by vortex, 2

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

Proceedings of 22nd International Conference on Nuclear Engineering (ICONE-22) (DVD-ROM), 7 Pages, 2014/07

Journal Articles

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

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

Proceedings of 21st International Conference on Nuclear Engineering (ICONE-21) (DVD-ROM), 7 Pages, 2013/07

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.

Journal Articles

Gas entrainment rate from free surface by vortex

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

Proceedings of 6th Japanese-European Two-Phase Flow Group Meeting (USB Flash Drive), 6 Pages, 2012/09

The gas entrainment rate into liquid by the vortex formed on the free surface was examined experimentally. Water, 20 cSt silicone oil and kerosene were used as test fluid in the experiments. When the liquid flow rate was low, small air bubbles were torn off from the vortex tip. The torn-off bubble flow rate was small. The gas entrainment increased drastically with the increase of the liquid flow rate. When the liquid level height in the vessel was low, only the latter type of the gas entrainment was observed. As the liquid level was increased, the former type was observed first and then the entrainment turned to the latter type. The physical properties of the viscosity and the surface tension had some effect on gas entrainment phenomena such as the gas entrainment rate and the initiation of the gas entrainment. The Kelvin-Helmholtz instability seemed to explain the inception of the bubble type and also the vortex type entrainment.

Journal Articles

Measurement of gas entrainment rate from free surface by vortex

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

Proceedings of 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference (ICONE-20 & POWER 2012) (DVD-ROM), 5 Pages, 2012/07

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. In the present experiments, test fluid was changed from water in the previous experiments to 20 cSt silicone oil. The liquid level in the test vessel was 25 mm in the present experiments. Only the vortex-type gas-entrainment was observed as in the previous experiments since the liquid level was low. The flow state observed at the flow visualization section of the outlet pipe was only a semi-annular flow. The initiation of the gas entrainment was delayed in the case of silicone oil compared with the case of water. The increasing rate of the gas entrainment to the liquid velocity is milder in the case of silicone oil than in the case of water.

Oral presentation

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

no journal, , 

Gas entraiment phenomena are one of important issues in sodium-cooled fast reactors. As a part of various studies on gas entrainment phenomena, the authors have conducted a simple experiment to measure the entrained gas flow rate. In this presentation, we show the experimental results with silicone oil as the working fluid, instead of water in the previous study.

Oral presentation

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

no journal, , 

In the Japanese sodium-cooled fast reactor, it is expected that the gas entrainment might be caused when coolant velocity becomes very high. The authors have been studied the gas entrainment flow rate experimentally by using water and silicon oil as the working fluids. In this study, kerosene is used to investigate the effect of fluid property.

Oral presentation

Observation of gas entrainment from free surface by vortex and measurement of entrained gas flow rate, 4

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

no journal, , 

In the study on the safety of the Japanese sodium-cooled fast breeder reactor, the cover gas entrainment into the sodium coolant has been examined. The authors are investigating experimentally the entrained gas flow rate caused by the free surface vortex. In this report, the experimental results with high temperature water is presented.

Oral presentation

Observation of gas entrainment from free surface by vortex and measurement of entrained gas flow rate, 5

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

no journal, , 

The cover gas entrainment into the primary-loop coolant is one of safety issues in sodium-cooled fast reactors. Therefore, the authors have investigated experimentally the gas entrainment phenomena caused by a free-surface vortex. In this report, the effect of fluid property on the gas entrainment flow rate is discussed.

Oral presentation

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

no journal, , 

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.

Oral presentation

Observation of gas entrainment from free surface by vortex and measurement of entrained gas flow rate, 6; Effect of physical properties for gas entrainment rate

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

no journal, , 

Gas entrainment phenomena are concerned in the study on the safety design criteria of the Japanese sodium-cooled fast reactor. The authors have conducted experiments to investigate the gas entrainment by the hollow vortex on a free surface. In this report, several fluids with various propeties are employed as the working fluids and the influence of fluid property is investigated.

Oral presentation

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

no journal, , 

Oral presentation

Evaluate in liquid properties and observation in gas entrainment from the free surface by vortex

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

no journal, , 

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. 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. 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 entertainment 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 entertainment phenomena.

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