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Journal Articles

Three-dimensional cellular premixed flames generated by hydrodynamic and diffusive-thermal instabilities (Effects of unburned-gas temperature and heat loss)

Kadowaki, Satoshi; Nogami, Masato*; Thwe, T. A.; Katsumi, Toshiyuki*; Yamazaki, Wataru*; Kobayashi, Hideaki*

Nihon Kikai Gakkai Rombunshu (Internet), 85(879), p.19-00274_1 - 19-00274_13, 2019/11

We dealt with three-dimensional cellular premixed flames generated by hydrodynamic and diffusive-thermal instabilities to elucidate the effects of unburned-gas temperature and heat loss by adopting the three-dimensional compressible Navier-Stokes equation. As the unburned-gas temperature became lower and the heat loss became larger, the growth rate decreased and the unstable range narrowed. With a decrease of unburned-gas temperature, the normalized growth rate increased and the normalized unstable range widened, which was because the temperature ratio of burned and unburned gases became larger. The obtained hexagonal cellular fronts were qualitatively consistent with the experimental results. As the heat loss became larger, the burning velocity of a cellular flame normalized by that of a planar flame increased. This was because diffusive-thermal effects became stronger owing to the increase of apparent Zeldovich number caused by the decrease of flame temperature.

Journal Articles

A Noniterative mean-field QM/MM-type approach with a linear response approximation toward an efficient free-energy evaluation

Kido, Kentaro

Journal of Computational Chemistry, 40(24), p.2072 - 2085, 2019/09

 Times Cited Count:1 Percentile:9.61(Chemistry, Multidisciplinary)

Journal Articles

3D X Ray micro-tomography as a tool to formulate metakaolin-based geopolymer-oil emulsions

Lambertin, D.*; Davy, C. A.*; Hauss, G.*; Planel, B.*; Marchand, B.*; Cantarel, V.

Proceedings of 1st International Conference on Innovation in Low-Carbon Cement and Concrete Technology (ILCCC 2019) (USB Flash Drive), 4 Pages, 2019/06

Composite materials made of geopolymer (GP) cement and organic liquids are useful to synthetize porosity-controlled media, for the management of radioactive organic liquid waste, or as phase change materials (PCM). Indeed, GP cements are able to integrate huge amounts of organic oils by direct emulsion in the fresh paste. The emulsion (GEOIL) remains stable during GP hardening. In this contribution, by using 3D X Ray micro Computed Tomography (micro CT) with a voxel size of 1 micron$$^{3}$$, we investigate the effect of formulation parameters (oil proportion, Si/Al molar ratio, surfactant) on the 3D oil droplet structure of GEOIL pastes. Samples are emulsified in the fresh state, and imaged in the hardened state. Porosity, oil droplet size distribution and mean distance between droplets are all determined quantitatively. It is observed that the presence of surfactant provides significantly smaller oil droplets. The increase in Si/Al ratio also decreases the oil droplet sizes, but to a lesser extent.

Journal Articles

Numerical study of sediment and $$^{137}$$Cs discharge out of reservoirs during various scale rainfall events

Kurikami, Hiroshi; Funaki, Hironori; Malins, A.; Kitamura, Akihiro; Onishi, Yasuo*

Journal of Environmental Radioactivity, 164, p.73 - 83, 2016/11

AA2015-0827.pdf:2.61MB

 Times Cited Count:12 Percentile:46.45(Environmental Sciences)

We performed simulations using the three-dimensional finite volume code FLESCOT to understand sediment and radiocesium transport in generic models of reservoirs with parameters similar to those in Fukushima Prefecture. The simulations model turbulent water flows, transport of sediments with different grain sizes, and radiocesium migration both in dissolved and particulate forms. To demonstrate the validity of the modeling approach for the Fukushima environment, we performed a test simulation of the Ogaki Dam reservoir over a typhoon. We simulated a set of generic model reservoirs systematically varying features such as flood intensity, reservoir volume and the radiocesium distribution coefficient. The results ascertain how these features affect the amount of sediment or $$^{137}$$Cs discharge downstream from the reservoirs, and the forms in which $$^{137}$$Cs is discharged. Silt carries the majority of the radiocesium in the larger flood events, while the clay-sorbed followed by dissolved forms are dominant in smaller events. The results can be used to derive indicative values of discharges from Fukushima reservoirs under arbitrary flood events.

Journal Articles

Numerical analysis of three-dimensional two-phase flow behavior in a fuel assembly

Takase, Kazuyuki; Yoshida, Hiroyuki; Ose, Yasuo*; Akimoto, Hajime

WIT Transactions on Engineering Sciences, Vol.50, p.183 - 192, 2005/00

no abstracts in English

Journal Articles

Numerical analysis of a water-vapor two-phase film flow in a narrow coolant channel with a three-dimensional rectangular rib

Takase, Kazuyuki; Yoshida, Hiroyuki; Ose, Yasuo*; Tamai, Hidesada

JSME International Journal, Series B, 47(2), p.323 - 331, 2004/05

no abstracts in English

Journal Articles

A New approach for three-dimensional atomic-image reconstruction from a single-energy photoelectron hologram

Matsushita, Tomohiro*; Agui, Akane; Yoshigoe, Akitaka

Europhysics Letters, 65(2), p.207 - 213, 2004/01

 Times Cited Count:29 Percentile:76.54(Physics, Multidisciplinary)

A "scattering pattern matrix" method is proposed here to overcome the difculties presented by photoelectron holography, such as forward-scattering and multi-energyproblems. This method makes it possible to reconstruct a three-dimensional atomic arrangement from a single-energy hologram. We have utilized the "scattering pattern matrix" that includes the angular variation of the scattered object waves, and we have adopted a specialaverage process and the gradient projection method for minimizing the mean-squared error. The reconstruction of the Si bulk structure is demonstrated by using an experimental Si(111) 2s single-energy hologram.

JAEA Reports

Development of capsule design support subprograms for 3-dimensional temperature calculation using FEM code NISA

Tobita, Masahiro*; Matsui, Yoshinori

JAERI-Tech 2003-042, 132 Pages, 2003/03

JAERI-Tech-2003-042.pdf:7.19MB

Prediction of irradiation temperature is one of the important issues in the design of the capsule for irradiation test. Many kinds of capsules with complex structure have been designed for recent irradiation requests, and three-dimensional (3D) temperature calculation becomes inevitable for the evaluation of irradiation temperature. For such 3D calculation, however, many works are usually needed for input data preparation, and a lot of time and resources are necessary for parametric studies in the design. To improve such situation, JAERI introduced 3D-FEM (finite element method) code NISA (Numerically Integrated elements for System Analysis) and developed several subprograms, which enabled to support input preparation works in the capsule design. The 3D temperature calculation of the capsule are able to carried out in much easier way by the help of the subprograms, and specific features in the irradiation tests such as non-uniform gamma heating in the capsule, becomes to be considered.

JAEA Reports

Potential energies for the two lowest $$^{1}$$A' electronic states of H$$_{3+}$$

Ichihara, Akira; Yokoyama, Keiichi; Iwamoto, Osamu

JAERI-Data/Code 98-031, 18 Pages, 1998/11

JAERI-Data-Code-98-031.pdf:0.89MB

no abstracts in English

JAEA Reports

MOSRA-Light; High speed three-dimensional nodal diffusion code for vector computers

Okumura, Keisuke

JAERI-Data/Code 98-025, 243 Pages, 1998/10

JAERI-Data-Code-98-025.pdf:10.15MB

no abstracts in English

Journal Articles

Experimental analysis for 3-D flow in lower plenum by flow visualization

Kunii, Katsuhiko

Flow Visualization and Image Processing 1997, Vol.2, p.592 - 597, 1997/02

no abstracts in English

Journal Articles

Journal Articles

Flow reversal in a horizontal channel with mixed convection

*; Kunugi, Tomoaki; *

Album of Visualization,No. 13, 0, p.19 - 20, 1996/00

no abstracts in English

Journal Articles

Air cooling design on stand pipe used for control rod of HTTR

Takeda, Takeshi; Kunitomi, Kazuhiko; Okubo, Minoru

Nihon Genshiryoku Gakkai-Shi, 38(4), p.307 - 314, 1996/00

no abstracts in English

Journal Articles

Three-dimensional numerical simulation of strong evaporation and condensation for plasma-facing materials

Kunugi, Tomoaki; *

16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 2, p.1107 - 1110, 1995/00

no abstracts in English

Journal Articles

Three-dimensional thermo-fluiddynamic analysis of gas flow in hot leg with fission product deposition

Maruyama, Yu; Igarashi, Minoru*; Nakamura, Naohiko; Hashimoto, Kazuichiro; Sugimoto, Jun

The 3rd JSME/ASME Joint Int. Conf. on Nuclear Engineering, Vol. 3, 0, p.1247 - 1251, 1995/00

no abstracts in English

Journal Articles

Numerical analysis of mixed convective heat transfer in a square channel uniform wall temperature

Kunugi, Tomoaki; *; *

Nihon Kikai Gakkai Rombunshu, B, 60(572), p.1393 - 1400, 1994/04

no abstracts in English

Journal Articles

Effects of three dimensional flow separation due to non-uniform heating on laminar mixed convection in a square channel

Kunugi, Tomoaki; *; *

Proc. of 10th Int. Heat Transfer Conf., 0, p.501 - 506, 1994/00

no abstracts in English

Journal Articles

Laminar mixed convection with flow reversal in a horizontal isothermal square channel

Kunugi, Tomoaki; *; *

Therm. Sci. Eng., 2(3), p.9 - 17, 1994/00

no abstracts in English

JAEA Reports

Development of a three-dimensional local scale atmospheric model with turbulence Closure model

Yamazawa, Hiromi

JAERI-M 89-062, 21 Pages, 1989/05

JAERI-M-89-062.pdf:0.47MB

no abstracts in English

30 (Records 1-20 displayed on this page)