Numerical Modeling of Grinding Rate in Granular Flow of Brittle Materials

Chikamori, Kazuhiro; Kitamura, Yuichiro; Ogawa, Masayoshi; Aoki, Hideyuki; Miura, Takatoshi

doi:10.2355/tetsutohagane1955.86.2_73

Cited by 9 publications

(1 citation statement)

References 5 publications

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“…Then the energy was compared with the drum index (DI). 22,23) If the relationships among energy of impact, DI and coke strength in blast furnace become quantitatively clear, these results will be a very important information for determination of the actual strength required for blast furnace. Moreover, the appropriate charging method considering the sufficient coke strength for each position at the throat can be practically determined.…”

Section: Solid Motion In Packed Bed Of Blast Furnace 421 Total Anamentioning

confidence: 99%

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

Ueda¹,

Natsui²,

Nogami³

et al. 2010

ISIJ Int.

146

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Currently low reducing agent operation of blast furnace has been actively pursued in ironmaking due to the global warming. The precise and reliable control of blast furnace aiming at the low reducing operation is required to attain smoothly the stable operation. It is considered that the mathematical model on the ironmaking process can play an important role to ensure the stable blast furnace operation. A mathematical model is a powerful tool to improve conventional processes and to design new processes in ironmaking. These tendencies and requirements are common to every country. Thus, the development of advanced mathematical models of blast furnace like DEM (Discrete Element Method) has attracted a special attention in ironmaking field. Moreover, the combined model of DEM with the continuum model is under development for the purpose of the accurate understanding of inner state of blast furnace. In this paper, the recent activity and progress on the development of advanced mathematical model of blast furnace and future perspective for desirable model are described.KEY WORDS: ironmaking; blast furnace; mathematical model; discrete element method; solid flow; particle method; contiuum model. Review Fig. 1. Transition of blast furnace operating condition in Japan.

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Section: Solid Motion In Packed Bed Of Blast Furnace 421 Total Anamentioning

confidence: 99%

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

Ueda¹,

Natsui²,

Nogami³

et al. 2010

ISIJ Int.

146

View full text Add to dashboard Cite

show abstract

Grain Boundary Energy and Atomic Structure of <110> Symmetric Tilt Boundaries in Copper

Takata¹,

Ikeda²,

Yoshida³

et al. 2004

J. Japan Inst. Metals

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ÞãBåwåw@ ¶(Graduate Student, Kyushu University) In order to clarify the correlation between the grain boundary energy and its atomic structure in copper, energy and atomic structure ofq110rsymmetric tilt boundaries in copper were simulated by molecular dynamics method. From the calculations, it was revealed that the grain boundary energy ofq110rsymmetric tilt boundaries strongly depended on misorientation and that there are deep energy cusps at the misorientation angles which correspond to (111)S3 and (113)S11 symmetric tilt boundaries. It was found that the atomic structure of eachq110rsymmetric tilt boundary was described by three kinds of structural units which constitute (331)S19, (111)S3 and (113)S11 symmetric tilt boundaries respectively, and by (110) and (001) single crystal units. The volume expansion of each grain boundary was evaluated and compared with the grain boundary energy. As a result, it was elucidated that the grain boundary energy depends on the excess free volume of symmetric tilt boundaries.

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Atomic Structure and Electronic State of <110> Symmetric Tilt Boundaries in Palladium

Mizuguchi¹,

Takata²,

Ikeda³

et al. 2005

J. Japan Inst. Metals

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In this study, the energy and atomic structure of the〈110〉symmetric tilt boundaries in palladium were calculated using a molecular dynamics (MD) method and the electronic structures of hydrogen in the bulk and at the grain boundaries were calculated using discrete variational Xa (DV Xa) molecular orbital cluster calculaion by solving Hartree Fock Slater equation.The result of MD simulation revealed that the energy of the〈110〉symmetric tilt boundary of palladium depended on the misorientation angle and that there were large energy cusps at the misorientation angles which correspond to the {111}S3 and {113} S11 symmetric tilt boundaries. The atomic structure of all 〈110〉symmetric tilt boundaries could consist of the combination of the {331} S19, {111}S3 and {113}S11 structural units and {110}S1 and {001}S1 single crystal units.The result of DVXa molecular orbital cluster calculation showed that the interstitial hydrogen atoms induced the palladium hydrogen chemical bond which had a different energy level from the palladium palladium bond. The component of the palladium hydrogen bond at the grain boundaries was similar to those in the bulk palladium. It is clarified that electronic structure near the grain boundary is different from that in the perfect crystal.

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Numerical Modeling of Grinding Rate in Granular Flow of Brittle Materials

Cited by 9 publications

References 5 publications

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

Grain Boundary Energy and Atomic Structure of <110> Symmetric Tilt Boundaries in Copper

Atomic Structure and Electronic State of <110> Symmetric Tilt Boundaries in Palladium

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