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Journal Articles

Observation of aerosol particle capturing behavior near gas-liquid interface

Uesawa, Shinichiro; Yoshida, Hiroyuki

Mechanical Engineering Journal (Internet), 7(3), p.19-00539_1 - 19-00539_9, 2020/06

Journal Articles

Observation of aerosol particle behavior near gas-liquid interface

Uesawa, Shinichiro; Miyahara, Naoya; Horiguchi, Naoki; Yoshida, Hiroyuki; Osaka, Masahiko

Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 5 Pages, 2019/05

Journal Articles

Visualization study on droplet-entrainment in a high-speed gas jet into a liquid pool

Sugimoto, Taro*; Saito, Shimpei*; Kaneko, Akiko*; Abe, Yutaka*; Uchibori, Akihiro; Ohshima, Hiroyuki

Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 7 Pages, 2018/07

A computational fluid dynamics code for a sodium-water reaction phenomenon in a steam generator of sodium-cooled fast reactors has been developed. In order to provide the data for validation of this code, the visualization experiment on liquid droplet entrainment in the high-pressure air jet submerged in the water pool was carried out. The experiment successfully elucidated the behavior, such as atomization of the relatively large diameter liquid droplet generated from the gas-liquid interface.

Journal Articles

Development of a mechanistic evaluation method for wastage environment under sodium-water reaction accident

Uchibori, Akihiro; Ohshima, Hiroyuki

Proceedings of 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-16) (USB Flash Drive), p.533 - 544, 2015/08

For assessment of the wastage environment under tube failure accident, a mechanistic computer code called SERAPHIM calculating compressible multicomponent multiphase flow with sodium-water chemical reaction has been developed. In this study, applicability of the SERAPHIM code including the numerical model for liquid droplet entrainment and transport was investigated through the analysis of the basic experiment and the experiment under actual condition of the steam generator. In the analysis of the basic experiment, the calculated pressure variation during liquid droplet entrainment was consistent with the experimental result. In the analysis of the actual condition, the calculated temperature distribution agreed with the measurement result well. The region with higher impingement velocity of the liquid droplet was close to the wastage region confirmed in the experiment. It was demonstrated that the SERAPHIM code could predict the wastage environment under the actual condition.

Journal Articles

Effect of flow obstacle on droplet sizes in vertical annular air-water flow in a small diameter pipe

Shibamoto, Yasuteru; Sun, Haomin; Yonomoto, Taisuke

Proceedings of 10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10) (USB Flash Drive), 10 Pages, 2014/12

Journal Articles

Micro-PIXE for the study of atmospheric environment

Kasahara, Mikio*; Ma, C.-J.*; Okumura, Motonori*; Kojima, Takuji; Hakoda, Teruyuki; Taguchi, Mitsumasa; Sakai, Takuro; Ohara, Yoshihiro

JAEA-Review 2005-001, TIARA Annual Report 2004, p.293 - 295, 2006/01

Artificial cloud generation experiment was performed using a huge vertical pit located in Kamaishi iron-copper mine to investigate the characteristics of cloud. The physical and chemical properties of individual cloud droplets were examined by microscopic analysis at Kyoto university and micro-PIXE analysis at TIARA. The process of growth of cloud was clarified based on the result on droplet size, its distribution, droplet number concentration, and the change in distribution of chlorine in droplet as the function of size.

Journal Articles

Pitting damage evaluation by liquid/solid interface impact analysis

Naoe, Takashi; Futakawa, Masatoshi; Oi, Toshiyuki; Ishikura, Shuichi*; Ikeda, Yujiro

Zairyo, 54(11), p.1184 - 1190, 2005/11

High power spallation targets for neutron sources are being developed in the world. Mercury target will be installed at the material science and life facility in J-PARC, which will promote innovative science. The mercury target is subject to the pressure wave caused by the proton bombarding in the mercury. The pressure wave propagation induces the cavitation in mercury that imposes localized impact damage on the target vessel. The impact erosion is a critical issue to decide the lifetime of the target. The electro Magnetic IMpact Testing Machine, MIMTM, was developed to reproduce the localized impact erosion damage and evaluate the damage formation. Additionally, droplet impact analysis was carried out to investigate the correlation between isolate pit profile and micro-jet velocity. We confirmed that value of depth/radius was able to estimate micro jet-velocity. And the velocity at 560W in MIMTM was estimated to be 225$$sim$$325 m/s. Furthermore, surface-hardening treatments were inhibited pit formation in plastic deformation.

Journal Articles

Numerical simulation of droplet dynamics using level set method

Watanabe, Tadashi

Proceedings of 11th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-11) (CD-ROM), 8 Pages, 2005/10

no abstracts in English

JAEA Reports

Numerical analysis of interfacial growth and deformation in horizontal stratified two-phase flow by lattice Boltzmann method

Ebihara, Kenichi

JAERI-Research 2005-004, 121 Pages, 2005/03

JAERI-Research-2005-004.pdf:19.79MB

This report is the JAERI's report version of the doctor thesis by the author. In this report, first, the validity and usefulness of the application of the two-phase fluid model of the lattice-gas method and the lattice Boltzmann method(LBM) are examined. On the basis of the examination, next, the horizontal stratified two-phase flow that is the fundamental and important flow is simulated by the HCZ model which is one of the two-phase fluid model of the LBM. It is seen that the interfacial growth of the HCZ model satisfies the Kelvin-Helmholtz instability theory and reproduces the theoretical two-phase flow regime map of Taitel and Dukler(T-D map). It is found that more superficial flow velocity of the rare phase is necessary in the channel with the narrow width. The HCZ model can also simulate the droplet generation accompanying more complex interfacial phenomena and reproduce the experimental correlation of Ishii and Grolmes in the range of the distribution of the experimental data.

Journal Articles

Study on interfacial growth and deformation of horizontal stratified two-phase flow by lattice Boltzmann method

Ebihara, Kenichi

Tsukuba Daigaku Daigakuin Shisutemu Joho Kogaku Kenkyuka Hakase Gakui Rombun, 134 Pages, 2004/09

In this thesis, first the liquid-gas models of the lattice method are examined by applying them to two-phase flow simulations. Next the liquid-gas model(the HCZ model) of the lattice Boltzmann method is applied to the three-dimensional simulation of the horizontal stratified two-phase flow. The following results are obtained. (1)The two- and three- dimensional interface simulated by the HCZ model satisfies the Kelvin-Helmholtz instability theory. (2)In the simulation of the interfacial growth in the rectangular channel, it is found that the relation between the interfacial growth and the flow state is in agreement with the flow regime map proposed theoretically by Taitel and Dukler. (3)It is also found that the three dimensionality becomes remarkable and the interfacial growth needs more flow rate of the rare phase than that of the theoretical flow regime map when the channel width is narrower. (4)In the droplet creation simulation, it is found that the relation between the droplet creation and the flow state simulates the experimental correlation proposed by Ishii and Grolmes.

Journal Articles

The Lattice Boltzmann simulation of the droplet creation in the horizontal stratified two-phase flow

Ebihara, Kenichi; Watanabe, Tadashi

Nagare, 23(4), p.253 - 261, 2004/08

The lattice Boltzmann method for one-component two-phase fluid is applied to the simulation of the droplet creation in the horizontal stratified two-phase flow. It is observed in several flow states that the droplet tears from the interface wave. The dimensionless numbers that characterize the flow state are also measured during the simulations. After checking the influence of the lattice length and width to the simulation result, the relation between the droplet creation and the measured dimensionless numbers is compared with the inception criteria of the droplet creation that was proposed on the basis of experimental data by Ishii and Grolmes. It was found that the simulation results are included in the devitation of experimental data from the correlation of Ishii-Grolmes.

Journal Articles

Unit sphere concept for macroscopic triggering of large-scale vapor explosions

Maruyama, Yu*; Moriyama, Kiyofumi; Nakamura, Hideo

Journal of Nuclear Science and Technology, 39(8), p.854 - 864, 2002/08

 Times Cited Count:4 Percentile:30.46(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Impact behavior of mercury droplet

Date, Hidefumi*; Futakawa, Masatoshi; Ishikura, Shuichi*

Jikken Rikigaku, 2(2), p.103 - 108, 2002/06

In order to examine the impact behavior of mercury, which is one of important key-issues in a facility for high intensity neutron sources, the falling and colliding profiles of mercury droplets were recorded by high-speed video recorder. The impact force was also measured using the strain gage glued on an elastic bar. The falling mercury droplet oscillated between a prolate spheroid and an oblate one, repeatedly. The regathering and jumping of mercury at the collision point on the impact face of the target were observed after impact because of the strong surface tension of mercury. The impact force of mercury droplet was in proportion to the impact velocities and the square root of the potential energy. Scince the non-dimensional duration time K that obtained experimentally is independent of the impact velocity and the size of the droplet, the mean applied stress due to the mercury droplet against the target is easily predictable by the equatiion using K value and the impact velocity is known.

JAEA Reports

The Premixing and propagation phases of fuel-coolant interactions; A Review of recent experimental studies and code developments

A.R.Antariksawan*; Moriyama, Kiyofumi; H.Park*; Maruyama, Yu; Y.Yang*; Sugimoto, Jun

JAERI-Review 98-012, 66 Pages, 1998/09

JAERI-Review-98-012.pdf:3.36MB

no abstracts in English

Journal Articles

Investigation of pre- and post-dryout heat transfer of steam-water two-phase flow in a rod bundle

; Koizumi, Yasuo; Tasaka, Kanji

Nucl.Eng.Des., 102, p.71 - 84, 1987/00

 Times Cited Count:18 Percentile:83.98(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Investigation of uncovered-bundle heat transfer under high-pressure boil-off conditions

; Koizumi, Yasuo; ; Osakabe, Masahiro; Tasaka, Kanji

Nucl.Eng.Des., 96, p.81 - 94, 1986/00

 Times Cited Count:3 Percentile:41.55(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Report on Reflood Experiment of Grid Spacer Effect

; Murao, Yoshio

JAERI-M 84-131, 223 Pages, 1984/06

JAERI-M-84-131.pdf:4.14MB

no abstracts in English

JAEA Reports

Droplets Flow and Heat Transfer at Top Region of Core in Reflood Phase

Osakabe, Masahiro; ;

JAERI-M 83-022, 26 Pages, 1983/02

JAERI-M-83-022.pdf:0.86MB

no abstracts in English

Journal Articles

Heat removal tests for PWR containment spray by large scale facility

; ; ; ; ;

Nuclear Technology, 63, p.316 - 329, 1983/00

 Times Cited Count:2 Percentile:35.76(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Behavior of sodium aerosol in atmosphere

; ; ;

Journal of Nuclear Science and Technology, 11(2), p.65 - 71, 1974/02

 Times Cited Count:9

no abstracts in English

21 (Records 1-20 displayed on this page)