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Journal Articles

Reaction path and product analysis of sodium-water chemical reactions using laser diagnostics

Deguchi, Yoshihiro*; Muranaka, Ryota*; Kamimoto, Takahiro*; Takagi, Taku*; Kikuchi, Shin; Kurihara, Akikazu

Applied Thermal Engineering, 114, p.1319 - 1324, 2017/03

 Times Cited Count:2 Percentile:13.03(Thermodynamics)

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products quantitatively. The counter-flow diffusion experiment device was employed to analyze the reaction path and reaction products using laser diagnostics. The main product of sodium-water reaction was determined to be NaOH and the sodium oxide was not notably measured compared with NaOH.

Journal Articles

Reaction path and product analysis of sodium-water chemical reactions using laser diagnostics

Deguchi, Yoshihiro*; Muranaka, Ryota*; Kamimoto, Takahiro*; Takagi, Taku*; Kikuchi, Shin; Kurihara, Akikazu

Proceedings of 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT 2015) (CD-ROM), 6 Pages, 2015/10

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products quantitatively. The counter-flow diffusion experiment device was employed to analyze the reaction path and reaction products using laser diagnostics. The main product of sodium-water reaction was determined to be NaOH and the sodium oxide was not notably measured compared with NaOH.

Journal Articles

Reaction path analysis to sodium-water chemical reaction field using laser diagnostics

Tamura, Kenta*; Deguchi, Yoshihiro*; Muranaka, Ryota*; Kusano, Koji*; Takata, Takashi*; Kikuchi, Shin; Kurihara, Akikazu

Proceedings of 24th International Symposium on Transport Phenomena (ISTP-24) (USB Flash Drive), 5 Pages, 2013/11

The purpose of this study aims to clarify the gas phase sodium-water reaction path and reaction products. The counter-flow diffusion experiment device is in the form of introducing the argon-based water vapor from the top of depressurized reaction chamber to the liquid sodium pool. Na, Na$$_{2}$$, H$$_{2}$$O, and reaction products in the counter-flow sodium-water reaction field were measured using laser diagnostics. The temperature controlled device was also improved to reduce the condensation of Na in the reaction zone for the better measurement performance. The main product in the sodium-water reaction was determined to be NaOH from the experimental results and its reaction path was discussed using Na-H$$_{2}$$O elementary reaction analysis.

Journal Articles

Application of laser diagnostics to sodium-water chemical reaction field

Deguchi, Yoshihiro*; Tamura, Kenta*; Muranaka, Ryota*; Kusano, Koji*; Kikuchi, Shin; Kurihara, Akikazu

Reza Kenkyu, 41(11), p.927 - 931, 2013/11

In a sodium-cooled fast reactor (SFR), liquid sodium is used as a heat transfer fluid because of its excellent heat transport capability. On the other hand, it has strong chemical reactivity with water vapor. One of the design basis accidents of the SFR is the water leakage into the liquid sodium flow by a breach of heat transfer tubes. Therefore the study on sodium-water chemical reactions is of paramount importance for security reasons. This study aims to clarify the sodium-water reaction mechanisms using laser diagnostics. The measurement results show that the sodium-water reaction proceeds mainly by the reaction Na + H$$_{2}$$O = NaOH + H and the main product is NaOH from this reaction.

Oral presentation

Boost-up; Sodium-water counter-flow diffusion flame

Deguchi, Yoshihiro*; Tamura, Kenta*; Muranaka, Ryota*; Kitani, Taiyo*; Kusano, Koji*; Kikuchi, Shin; Kurihara, Akikazu

no journal, , 

It is a photograph of the sodium-water counter-flow diffusion flame formed by water vapor introduced to a liquid sodium pool. The orange part is the sodium emission (D line: 589 nm) emerged by sodium-water reactions, and the green part is the reaction products (NaOH etc.) and sodium fine particles visualized by a laser scattering method. By controlling the water vapor temperature, reaction products and sodium fine particles can be shaped like arms which boost up the sodium emission.

Oral presentation

Reaction path analysis of sodium-water chemical reaction field using laser diagnostics

Muranaka, Ryota*; Deguchi, Yoshihiro*; Tamura, Kenta*; Takata, Takashi*; Kikuchi, Shin; Kurihara, Akikazu

no journal, , 

In a sodium-cooled fast reactor (SFR), liquid sodium is used as a heat transfer fluid because of its excellent heat transport capability. On the other hand, it has strong chemical reactivity with water vapor. One of the design basis accidents of the SFR is the water leakage into the liquid sodium flow by a breach of heat transfer tubes. Therefore, the study on sodium-water chemical reactions is of importance for security reasons. This study aims to clarify the gas phase sodium-water reaction path and reaction products. Na, Na$$_{2}$$, H$$_{2}$$O, and reaction products in the counter-flow sodium-water reaction field were measured using laser diagnostics such as Raman scattering and photo-fragmentation. The main product in the sodium-water reaction was determined to be NaOH and its reaction path was discussed using Na-H$$_{2}$$O elementally reaction analysis.

Oral presentation

Clarification of sodium-water chemical reaction using laser diagnostics

Deguchi, Yoshihiro*; Tamura, Kenta*; Muranaka, Ryota*; Kikuchi, Shin; Kurihara, Akikazu

no journal, , 

Sodium-water reaction (SWR) is a design basis accident of a sodium-cooled fast reactor (SFR). In a sodium-cooled fast reactor (SFR), liquid sodium is used as a heat transfer fluid because of its excellent heat transport capability. On the other hand, it has strong chemical reactivity with water vapor. One of the design basis accidents of the SFR is the water leakage into the liquid sodium flow by a breach of heat transfer tubes. This study aims to identify the dominant gas phase reaction of sodium-water reaction. The sodium-water, sodium-oxygen and sodium-hydrogen reaction fields were used to delineate the sodium-water reaction mechanism. These reactions were measured using laser diagnostics such as LIF, Raman scattering, Mie scattering, Absorption and Photo-fragmentation. Using these techniques, the sodium-water reaction mechanisms were discussed with consideration for elementary reactions.

Oral presentation

Clarification of sodium-water chemical reaction using laser diagnostics

Deguchi, Yoshihiro*; Tamura, Kenta*; Muranaka, Ryota*; Kusano, Koji*; Takata, Takashi*; Kikuchi, Shin; Kurihara, Akikazu

no journal, , 

In a sodium-cooled fast reactor (SFR), liquid sodium is used as a heat transfer fluid because of its excellent heat transport capability. One of the design basis accidents of the SFR is the water leakage into the liquid sodium flow by a breach of heat transfer tubes in a steam generator. Therefore the study on sodium-water chemical reactions is of paramount importance for safety reasons. This study aims to clarify the sodium-water reaction mechanisms using laser diagnostics. The sodium-water, sodium-oxygen and sodium-hydrogen counter-flow reactions were measured using laser diagnostics such as Raman, absorption and photo-fragmentation spectroscopies. The measurement results show that the main product of the sodium-water reaction is NaOH. The sodium-water reaction rate is slower than that of the sodium-oxygen reaction and hydrogen does not react noticeably with sodium.

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