Refine your search:     
Report No.
 - 
Search Results: Records 1-19 displayed on this page of 19
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Numerical study on influence of Ohnesorge number and Reynolds number on the jet breakup behavior using the lattice Boltzmann method

Iwasawa, Yuzuru*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Saito, Shimpei*; Matsuo, Eiji*; Ebihara, Kenichi; Sakaba, Hiroshi*; Koyama, Kazuya*; Nariai, Hideki*

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 7 Pages, 2015/05

For the safety design in which heat is properly removed from the molten fuel after the core disruptive accident in a sodium-cooled fast reactor, the estimation of the breakup behavior of molten fuel discharged into the coolant like a jet is desired. In order to investigate the influence of viscocity on the jet behavior, we simulated a jet discharged into a coolant using the three-dimensional lattice Boltzmann model for two-phase fluid, and examined the influence of Ohnesorge number and Reynolds number on the jet behavior. As a result, we made clear that it is necessary to consider viscosity of the coolant as well as that of the jet for the estimation of jet behavior.

Journal Articles

Numerical simulation of self-priming phenomena in venturi scrubber by two-phase flow simulation code TPFIT

Horiguchi, Naoki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05

From the viewpoint of protecting containment and suppressing diffusion of the radioactive materials at severe accidents of nuclear power plant, it is important to install filtered venting devices to permit release of high pressure pollutant gas to the atmosphere by eliminating radioactive materials in the gas. A Multi Venturi Scrubber System (MVSS) is one of the devices for the filtered venting, and is used to realize filtered venting without any power supply. The MVSS is composed of a "Venturi Scrubbers" part and a "bubble column" part. In the Venturi Scrubbers part of the MVSS, there are hundreds of the Venturi scrubbers (VS). In an operation mode of the MVSS, the radioactive materials are eliminated through the gas-liquid interface from the pollutant gas to the liquid phase of a dispersed flow in the VS and a bubbly flow in the bubble column part. In the VS, the dispersed flow is formed from the liquid, which is suctioned through the hole for suction (called self-priming). In previous studies, an evaluation method to evaluate the liquid flow rate by the self-priming was developed. However, to develop evaluation methods of performance of the VSs, the two-phase flow behavior must be investigated, including droplet size and velocity difference of liquid and gas phases. Two-phase flow behavior in the VS is complicated, and it is difficult to estimate two-phase flow behavior of the VS by only experimental procedures. In this study, to investigate the hydraulic behavior of the VS, we tried to apply a detailed numerical simulation method of two-phase flow to the numerical simulation of the VS. In the simulation, TPFIT developed in JAEA was used as the detailed numerical simulation method. In this paper, we performed the numerical simulation air-water two-phase flow in the of the lab scale VS by the TPFIT, and numerical results were compared with experimental results.

Journal Articles

Development of prediction technology of two-phase flow dynamics under earthquake acceleration, 16; Experimental and numerical study of pressure fluctuation effects on bubble motion

Kato, Yuki; Yoshida, Hiroyuki; Yokoyama, Ryotaro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 8 Pages, 2015/05

Journal Articles

Development of evaluation method of liquid flow rate by self-priming phenomena in venturi scrubber

Horiguchi, Naoki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

Proceedings of 9th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-9) (CD-ROM), 5 Pages, 2014/11

Oral presentation

Experimental study of two-phase flow structure and pressure distribution in venturi scrubber

Horiguchi, Naoki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Effect of dielectric characteristics on transient boiling phenomena induced by microwave heating

Yamaki, Tatsunori*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Kitazawa, Toshihide*; Segawa, Tomomi; Kawaguchi, Koichi; Yamada, Yoshikazu

no journal, , 

For practical application of high-volume production of microwave heating denitration method, it is required to avoid the transient boiling phenomena of overflow and flushing during microwave heating and to optimize the design condition of vessel shape and microwave outpot. The boiling phenomena and flow structure of KCl aqueous solution by microwave heating were measured with the KCl concentration as a parameter. Flushing phenomena does not become difficult to occur and flow structure becomes disordered to be created the vortex structure according to increase of the KCl concentration. From the results of measuring the temperature distribution of side cross-section surface of the KCl jelly, near the center is mainly heated in the case of the water jelly. On the other hand, around the jelly is mainly heated in the KCl jelly. It is clarified that the generation condition of flushing and the boiling phenomena are significantly influenced by the difference of water and KCl solution.

Oral presentation

Criteria and mechanism of transient boiling phenomena induced by microwave heating

Yamaki, Tatsunori*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Kitazawa, Toshihide*; Segawa, Tomomi; Kawaguchi, Koichi; Yamada, Yoshikazu

no journal, , 

A mixed solution of uranyl nitrate and plutonium nitrate recovered from the spent fuel is converted directly to mixed oxide (MOX) powder in the microwave heating de-nitration process of the reprocessing plant. This research aimed at elucidating occurrence criteria and mechanism of flushing phenomena in order to avoid transient boiling phenomena such as overflow and flushing, and understand optimal design conditions. Flushing conditions were clarified by evaluating the correlation between absorbed power in the distilled water and released power by evaporation.

Oral presentation

Study on quench behavior at core disruptive accident for fast breeder reactor, 27; Numerical study on effect of viscosity on jet breakup behavior in liquid-liquid system using the lattice Boltzmann method

Iwasawa, Yuzuru*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Saito, Shimpei*; Matsuo, Eiji*; Ebihara, Kenichi; Sakaba, Hiroshi*; Koyama, Kazuya*; Nariai, Hideki*

no journal, , 

no abstracts in English

Oral presentation

Visualization of droplets generated by Venturi scrubber

Horiguchi, Naoki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Development of numerical simulation for jet breakup behavior in complicated structure of BWR lower plenum, 10; Effects of complicated structures on fragment diameter in jet breakup phenomena

Narushima, Yuki*; Suzuki, Takayuki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Applicability on two-phase flow simulation codes for Venturi scrubber

Horiguchi, Naoki; Yoshida, Hiroyuki; Nakao, Yasuhiro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Development of prediction technology of two-phase flow dynamics under earthquake acceleration, 29; Response characteristics of a single bubble in horizontal pipe to horizontal oscillation

Kato, Yuki; Yoshida, Hiroyuki; Yokoyama, Ryotaro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Development of evaluation method for two-phase flow in venturi scrubber for filtered venting, 2; Measurement with visualization of cross-sectional distribution of droplets

Horiguchi, Naoki; Yoshida, Hiroyuki; Nakao, Yasuhiro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Development of numerical simulation for jet break up behavior in complicated structure of BWR lower plenum, 12; Evaluation of jet breakup length in complicated structures using LIF method

Narushima, Yuki*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Suzuki, Takayuki*; Yoshida, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Development of evaluation method for two-phase flow in Venturi scrubber for filtered venting, 1; Measurement of liquid film thickness in diffuser part

Nakao, Yasuhiro*; Horiguchi, Naoki; Yoshida, Hiroyuki; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Development of prediction technology of two-phase flow dynamics under earthquake acceleration, 33; Three-dimensional measurement of a rising single bubble under the horizontal structure acceleration

Miyazaki, Akifumi*; Kato, Yuki*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Monji, Hideaki*; Yoshida, Hiroyuki; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Influence of the height of support on the convection behavior and heating efficiency under microwave heating

Chonan, Fuminori*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Yuasa, Tomohisa*; Segawa, Tomomi; Yamada, Yoshikazu

no journal, , 

no abstracts in English

Oral presentation

Development of evaluation method for two-phase flow in venturi scrubber for filtered venting, 4; Visualization of droplets generation on film flow in diffuser

Horiguchi, Naoki; Yoshida, Hiroyuki; Nakao, Yasuhiro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Abe, Yutaka*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of heating and microwave under microwave heating

Chonan, Fuminori*; Abe, Yutaka*; Kaneko, Akiko*; Kanagawa, Tetsuya*; Fujita, Shunya*; Yuasa, Tomohisa*; Segawa, Tomomi; Yamada, Yoshikazu

no journal, , 

no abstracts in English

19 (Records 1-19 displayed on this page)
  • 1