Updated on 2026/03/30

写真a

 
ITO, Kimihisa
 
Affiliation
Faculty of Science and Engineering, School of Fundamental Science and Engineering
Job title
Professor
Degree
(BLANK) ( The University of Tokyo )
(BLANK) ( The University of Tokyo )

Research Experience

  • 1996
    -
    　

    Waseda Univ. Professor

  • 1991
    -
    1996

    Waseda Univ., Associate Prof.

  • 1983
    -
    1991

    Tohoku Univ., Research Associate

  • 1986
    -
    1988

    Carnegie-Mellon Univ. Post-Doc

Education Background

  • 　
    -
    1983

    University of Tokyo   Graduate School, Division of Engineering   Metallurgy  

  • 　
    -
    1978

    University of Tokyo   Faculty of Engineering   Metallurgy  

Professional Memberships

  • 　
    　
    　

    日本金属学会

  • 　
    　
    　

    環境資源学会

  • 　
    　
    　

    日本物理学会

  • 　
    　
    　

    日本鉄鋼協会

Research Areas

  • Earth resource engineering, Energy sciences / Metals production and resources production / Mathematical physics and fundamental theory of condensed matter physics / Fundamental physical chemistry

Research Interests

  • 数理物質工学

Awards

  • TAWARA AWARD

    2017.03   The Iron and Steel Institute of Japan   Conditions for Ethringite Formation from the Reaction of Blast Furnace Slag with Alkaline Aqueous Solution

    Winner： Aya Harashima, Kimihisa Ito

  • SCIENTIFIC ACHIEVEMENT MERIT PRIZE

    2013.03   The Iron and Steel Institute of Japan   Fundamental study of the iron and steel refining processes

    Winner： Kimihisa Ito

  • NISHIYAMA COMMEMORATIVE PRIZE

    1998.04   The Iron and Steel Institute of Japan  

    Winner： Kimihisa Ito

  • 村上記念研究奨励賞

    1991.10  

  • John Chipman Award

    1991.04  

 

Papers

  • Simulation of Thermal Decomposition of Partially Calcined Spherical Limestone Injected into a Molten Iron Bath

    Yuichi Tsurukawa, Shinobu Owada, Kazuki Ito, Kimihisa Ito

    ISIJ INTERNATIONAL   62 ( 3 ) 602 - 605  2022

    DOI

    Scopus

  • Numerical Simulation of Impinging Gas Jet on a Liquid Bath Using SPH Method

    Jumpei Maruyama, Kazuki Ito, Makoto Ando, Jun Okada, Kimihisa Ito

    ISIJ INTERNATIONAL   60 ( 6 ) 1375 - 1377  2020

    DOI

    Scopus

    3
    Citation
    (Scopus)

  • Numerical simulation of flow characteristics of partially solidified steelmaking slag for the recovery of its sensible heat

    Yuichi Tsurukawa, Masahiro Tsuboi, Kimihisa Ito

    International Conference on Energy and Material Efficiency and CO2 Reduction in the Steel Industry     558 - 560  2017.10  [Refereed]

    Authorship：Corresponding author

  • Cold Model Experiment and Numerical Simulation of Flow Characteristics of Multi-phase Slag

    Masahiro Tsuboi, Kimihisa Ito

    ISIJ INTERNATIONAL   57 ( 7 ) 1191 - 1196  2017

    DOI CiNii

    Scopus

    10
    Citation
    (Scopus)

  • Three-Dimensional Modeling of Interfacial Tension with Smoothed Particle Hydrodynamics by Using Pairwise Potential

    Mieko Nakano, Kimihisa Ito

    ISIJ INTERNATIONAL   56 ( 7 ) 1297 - 1299  2016

    DOI

    Scopus

    8
    Citation
    (Scopus)

  • Three Dimensional Simulation of Lime Particle Penetration into Molten Iron Bath Using Smoothed Particle Hydrodynamics

    Mieko Nakano, Kimihisa Ito

    ISIJ INTERNATIONAL   56 ( 9 ) 1537 - 1542  2016

    DOI

    Scopus

    14
    Citation
    (Scopus)

  • The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

    Aya Harashima, Kimihisa Ito

    ISIJ INTERNATIONAL   56 ( 10 ) 1738 - 1745  2016

    DOI

    Scopus

    9
    Citation
    (Scopus)

  • The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

    Aya Harashima, Kimihisa Ito

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   101 ( 11 ) 566 - 573  2015

    DOI

    Scopus

    4
    Citation
    (Scopus)

  • Application of Particle Methods for the Analysis of Refining Reactions

    Kimihisa Ito

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   100 ( 11 ) 809 - 813  2014

  • Development of Simulation Model for Hot Metal Dephosphorization Process

    Shin-ya Kitamura, Kimihisa Ito, Farshid Pahlevani, Masaki Mori

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   100 ( 4 ) 491 - 499  2014

    DOI

    Scopus

    20
    Citation
    (Scopus)

  • Oxidation Rate of Solid Iron Using an Ar-H2O Mixture through CaO-SiO2-Al2O3-FeO Slag

    Masahiro Shimizu, Genki Abukawa, Kimihisa Ito

    ISIJ INTERNATIONAL   52 ( 8 ) 1497 - 1499  2012

    DOI

    Scopus

  • Utilization of Multiphase Fluxes for the Dephosphorization of Hot Metal

    Kimihisa Ito, Masahiro Terasawa

    STEEL RESEARCH INTERNATIONAL   80 ( 10 ) 733 - 736  2009.10

  • The Model Experiment on the Formation of 2CaO•SiO2-3CaO•P2O5 Phase in the Dephosphorization Slag

    Masayuki Kami, Masahiro Terasawa, Atsushi Matsumoto, Kimihisa Ito

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   95 ( 3 ) A236 - A240  2009.03

  • The Estimation of Structural Properties for the CaO-SiO2-CaCl2 Melts by Molecular Dynamics Simulations

    Kentaro Asakura, Kimihisa Ito

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   95 ( 3 ) A297 - A299  2009.03

  • Simulation of the Impingement of a Liquid Jet on a Molten Iron Bath by Using a Particle Method

    Masahito Asai, Hiroki Nijo, Kimihisa Ito

    ISIJ INTERNATIONAL   49 ( 2 ) 178 - 181  2009

    DOI

    Scopus

    12
    Citation
    (Scopus)

  • The estimation of structural properties for molten CaO-CaF2-SiO2 system by molecular dynamics Simulations

    Tsuyoshi Asada, Yoshiki Yamada, Kimihisa Ito

    ISIJ INTERNATIONAL   48 ( 1 ) 120 - 122  2008  [Refereed]

    DOI

    Scopus

    32
    Citation
    (Scopus)

  • Physical Chemistry of Slag-Metal Reaction in Hot Metal Pretreatment

    Proceedings of The Asia Steel International Conference 2006     62 - 65  2006.05

  • The evaluation of the mixing properties of the mechanically stirred cylindrical vessel

    Kimihisa Ito, Norihiro Yamamoto, Seiichiro Kuranaga

    ISIJ INTERNATIONAL   46 ( 12 ) 1791 - 1794  2006  [Refereed]

    DOI CiNii

    Scopus

    17
    Citation
    (Scopus)

  • Water Model Experiment for the Measurement of the mixing characteristics of a mechanically stirred cylindrical reactor

    Proceedings of The 12th ISIJ-VDEh Seminar     63 - 67  2005.11

  • 鉄鋼工学セミナーテキスト 熱力学

    日本鉄鋼協会    2005.07

  • 酸化チタンを含む酸化鉄系スラグの物理化学

    ITO Kimihisa, MATSUZAKI kenji

    鉄と鋼   91 ( 1 ) 28 - 32  2005.01

    　View Summary

    Physical chemistry of T1O_2-containing FeO-based slag should be valuable to understand the iron and steelmaking processes using iron sand In the present work, the activity of each component was estimated for Fe_1O-SiO_2-TiO2-MO_r (MO_r=CaO, MgO, AlO_<15>) melts by using regular solution modeI The empirical equation to estimate the reduction rate of the same melts by CO gas was derived from the experimental data The methodology of the estimation of thermodynamic and kinetic properties of TiO_2-containing FeO-based slag was established

    DOI CiNii

    Scopus

    2
    Citation
    (Scopus)

  • 機械式撹拌炉内の固液混合に及ぼす邪魔板の効果

    KUROYANAGI Shigeyoshi, YAMAMOTO Norihiro, IBA Atsushi, HORII Hiroyuki, ITO Kimihisa, KIKUCHI Naoki

    鉄と鋼   90 ( 6 ) 329 - 333  2004.06

    　View Summary

    For the application of the mechanical stirring method currently used in KR process to the new refining processes, the effect of baffles on the mixing of bath liquid and solid particles was investigated using a water model. The baffle whose width is 1/10 of the vessel diameter was enough to enhance the liquid-particles mixing. The LDV measurement showed the formation of the unsteady vertical flow by the baffle. The same effect on the mixing was observed by injecting gas from the bottom into the mechanically stirred vessel.

    DOI CiNii

    Scopus

    14
    Citation
    (Scopus)

  • The dissolution rate of solid lime into molten slag used for hot-metal dephosphorization

    T Hamano, M Horibe, K Ito

    ISIJ INTERNATIONAL   44 ( 2 ) 263 - 267  2004  [Refereed]

    　View Summary

    Highly efficient dissolution of CaO into melt has an important role in reducing the amount of steelmaking slag produced in the hot-metal dephosphorization process because the existence of free-CaO in the melt prevents reuse of the slag. There are numerous studies related to the rate of CaO dissolution, however, in many cases the experimental conditions have been limited. The present work measured the dissolution rate of CaO into several kinds of slags: FetO-CaO-SiO2-X (X,- CaF2, CaCl2, Al2O3 and B2O3) systems at hot-metal temperatures. To apply the results to practical operations, the efficiency of additives in dissolving CaO in the melts was compared using "the enhancement factor" based on the results.

  • Measurement of the volumetric mass-transfer coefficient for gas-liquid reaction in a mechanically stirred vessel

    FUJIURA Masakuni, YAMAMOTO Norihiro, ITO Kimihisa

    CAMPISIJ/日本鉄鋼協会   16 ( 4 ) 890 - 893  2003.09

    CiNii

  • 溶融CaO-SiO2-Al2O3スラグ中ZnOの熱力学

    環境資源工学   50 ( 3 ) 127 - 130  2003.08

    DOI CiNii

  • 還元溶解炉を用いた都市ごみ処理のシミュレーション

    環境資源工学   50 ( 3 ) 131 - 134  2003.08

    DOI CiNii

  • マテリアルサイエンスの基礎 速度論

    八千代出版    2003.02

  • Reaction Kinetics of FeO Containing Molten Slags

    Steel Research   70   1  2003.01

  • Reaction Kinetics of FeO Containin Molten Slags

    The 11th ISIJ-VDEh Seminar   74   9 - 13  2002.09

    DOI

    Scopus

    1
    Citation
    (Scopus)

  • Water Model Experiment of Fluid flow in Continuous Agitation Vacuum Agitation Vessel

    Proceedings of EMC 2001    2001.09

  • Distribution equilibria of Pb and Cu between CaO-SiO2-Al2O3 melts and liquid copper

    K Matsuzaki, T Ishikawa, T Tsukada, K Ito

    METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE   31 ( 6 ) 1261 - 1266  2000.12  [Refereed]

  • Simulation of Waste Treatment in Steelmaking Furnace

    Proc. of the Int. Conf. on Steel &amp; Society   463  2000.06

  • Physical Chemistry of FeO Based Slags Containing TiO2 and P2O5

    Proc. of the Int. Conf. on Steel &amp; Society     439  2000.06

  • Effect of P2O5 on Reduction Rate of FeO Containing Slags with CO gas

    Proc. of the 6th Int. Conf. on Molten Slags     92  2000.06

  • Development of Dephosphorization Simulator for The Minimization of Steelmaking Slags

    Proc. of the Int. Conf. on Steel &amp; Society     277  2000.06

  • マテリアルサイエンスの基礎 熱力学

    八千代出版    2000.02

  • 製鋼スラグ極小化委員会報告 脱りんシミュレータ

    日本鉄鋼協会    1999.11

  • Rate of reduction of FetO-SiO2-TiO2 melts with CO gas

    K Matsuzaki, T Maki, T Hamano, K Ito

    METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE   30 ( 4 ) 827 - 829  1999.08  [Refereed]

  • 鉄鋼工学セミナーテキスト 反応速度

    日本鉄鋼協会    1999.07

  • Waste Treatment in New Ironmaking Processes.

    East Asia Recycling Symposium, Tsukuba    1999.06

  • Activity Coefficient of Nickel Oxide in BaO-based Slags.

    Metallurgical and Materials Transactions   30B ( 1 ) 143 - 144  1999.04

    DOI DOI2

    Scopus

    4
    Citation
    (Scopus)

  • Thermodynamics of chromium oxides in CaO-SiO2-CaF2 slag

    Yasushi Okabe, Isao Tajima, Kimihisa Ito

    Metallurgical and Materials Transactions B   29 ( 1 ) 131 - 136  1998.02

    　View Summary

    The distribution ratio of chromium between a CaO-SiO2-CaF2 slag and liquid silver under the oxygen partial pressure used in practical hot-metal dephosphorization treatment was measured at 1623 K. The distribution ratio was minimal when the basicity index of a slag, wt pct CaO/wt pct SiO2, was about 2. The redox equilibrium between CrO (Cr2+) and CrO1.5 (Cr3+) in the slag was also measured as a function of slag composition. The calculated activity coefficient of CrO had a maximum value at wt pct CaO/wt pct SiO2=2, whereas that of CrO1.5 decreased monotonously with the increase in slag basicity.

    DOI DOI2

    Scopus

    19
    Citation
    (Scopus)

  • アジアにおける金属系材料の地球環境保全型・有効利用促進のための調査研究報告書

    日本機械工業連合会、 金属系材料研究開発センター    1997.03

  • Expansion of Injected Gas Bubble and Its Effects on Bath Mixing under Reduced Pressure.

    Tatsuoka Teruhisa, Kamata Chizuna, Ito Kimihisa

    ISIJ International   37 ( 6 ) 557 - 561  1997

    　View Summary

    The behavior of a single bubble was observed and the complete mixing time was measured under reduced pressure (∼1.33×102Pa (1 Torr)) using a silicon oil model. The bubble expanded greatly and changed from oval to a spherical-cup shape. The complete mixing time tended to be constant independent of the stirring power of gas per unit bath volume in the low vessel pressure range (<6.66×102Pa), because most of the expansion energy was dissipated and the mixing occurred near the bath surface; this was confirmed by observation of the flow.

    DOI CiNii

    Scopus

    17
    Citation
    (Scopus)

  • 古典的核生成理論を熱力学から考えてみよう

    Ito Kimihisa

    まてりあ   36 ( 1127 ) 1127 - 1130  1997

    DOI CiNii

  • Thermodynamics of NiO,CrO and CrO1.5 in CaO-SiO2-CaF2 Slag.

    Proceedings of the 5th International Conference on Molten Slags Fluxes and Salts./Iron and Steel Society    1997.01

  • Cold model experiments of gas removal from molten metal by an irradiation of ultrasonic waves

    M Kobayashi, C Kamata, K Ito

    ISIJ INTERNATIONAL   37 ( 1 ) 9 - 15  1997  [Refereed]

    DOI DOI2 CiNii

    Scopus

    14
    Citation
    (Scopus)

  • 希土類金属鉱石分解へのアルカリ水熱法の利用

    金属/アグネ技術センター    1996.08

  • 過酷環境使用金属系材料の研究課題に関する調査研究報告書

    日本機械工業連合会、金属系材料研究開発センター    1996.04

  • Model Study of Gas Removal from Melts Using High-Power Ultrasonic.

    International Congress of Steelmaking./Iron and Steel Society    1996.04

  • バストネサイト鉱石のアルカリ水熱反応速度

    資源と素材/資源素材学会   111;14  1995.12

  • Decomposition of Rare Earth Containing Ores by Alkaline Hydrothermal Process

    TOYODA Shoichi, ITO Kimihisa, TOKUDA Masanori

    Metallurgical Review of MMIJ/資源素材学会   12;2 ( 2 ) 60 - 70  1995.12

    CiNii

  • Mesurement of the Volumetric Mass Transfer Coefficient in a Cylindrical Gas Injected Vessel under Reduced Pressures

    Sakaguchi Kiyonobu, Ito Kimihisa

    ISIJ International/日本鉄鋼協会   35;11 ( 11 ) 1348 - 1353  1995.11

    　View Summary

    The behavior of bubbles in a vessel under reduced pressure was observed and the volumetric mass transfer coefficient was measured using a water model. The average diameter of the bubbles immediately after breaking away from the orifice increased with increasing gas flow rate corrected by the pressure at the orifice. An empirical equation for the volumetric mass transfer coefficients under normal and reduced pressures was developed, which can represent previous work using a water model.

    DOI DOI2 CiNii

    Scopus

    26
    Citation
    (Scopus)

  • 水熱法を用いた銅-マンガン複合酸化物の合成

    資源・素材関係学協会合同春季大会講演概要/資源・素材学会   1995   13 - 13  1995.09

    CiNii

  • 含希土類鉱石のアルカリ水熱分解

    資源と素材/資源素材学会   111;7  1995.07

  • Application of Gas-Lift Pump to Molten Metal System

    ISIJ International/日本鉄鋼協会   35;7  1995.07

  • 製鋼基礎

    鋳物/日本鋳造工学会   67;5  1995.05

  • SYNTHESIS OF BORON-NITRIDE FROM BORON-OXIDE USING SUPERCRITICAL AMMONIA

    K YOKOI, K ITO, M TOKUDA

    MATERIALS TRANSACTIONS JIM   36 ( 5 ) 645 - 648  1995.05  [Refereed]

  • Cold Model Experiments on the Application of Gas Lift Pump to the Transportation of Molten Metal.

    Kamata Chizuna, Ito Kimihisa

    ISIJ International   35 ( 7 ) 859 - 865  1995

    　View Summary

    Application of a gas lift pump to a molten metal system was evaluated by determining the effects of liquid properties on the pump's transportation characteristics using a water bath, a glycerol solution bath, and a Wood's metal bath. The flow in the gas lift pipe was in a "slug flow" regime when the pump was working. The critical gas flow rate, which is defined as the lowest gas flow rate required to transport the liquid, decreased with increase in the submergence and with decrease in pipe diameter in all systems. The density of the liquid strongly affected the lifted liquid volume whereas the viscosity had little influence on it. The empirical equation to predict the transportation of molten metal was derived using the slug flow model based on the corrected Nicklin's equation. The model was able to reproduce the critical gas flow retes obtained by the experiment.

    DOI CiNii

    Scopus

    21
    Citation
    (Scopus)

  • The grand partition function of dilute biregular solutions

    Kimihisa Ito, Meguru Nagamori, Motonori Tokuda

    Metallurgical and Materials Transactions B   25   703 - 711  1994.10

    　View Summary

    It has been demonstrated that the grand partition function (GPF) of biregular solutions contains in one single equation such thermodynamic principles as Henry's law, Raoult's law, the Gibbs-Duhem relation, Raoultian activity coefficients and their finite power series, Wagner's rec-iprocity, Schenck-Frohberg-Steinmetz's interchange, Lupis-Elliott's additivity, Mori-Morooka's disparity, and Darken's quadratic formalism. The logarithm of the Raoultian activity coefficient of species i, In γi should not be expressed by the Taylor series expansion, lest its truncation infringe the Gibbs-Duhem equation. The GPF methodology establishes that In γi, is not a vector but a scalar point function, free from any path dependence. While Darken's quadratic formalism employs three parameters to describe a ternary solution, the present biregularity approximation offers an alternative using seven empirical parameters, in case better accuracy is needed.

    DOI

  • Study on the foaming of CaO-SiO2-FeO slags: Part I. Foaming parameters and experimental results

    Kimihisa Ito, R. J. Fruehan

    Metallurgical Transactions B   20 ( 4 ) 509 - 514  1989.08

    　View Summary

    In order to understand the effect of slag composition on foaming in iron and steelmaking processes, slag foaming was quantitatively studied for CaO-SiO2-FeO slags in the temperature range of 1250 °C to 1400 °C. It was found that slag foaming could be characterized by a foaming index (Σ), which is equal to the retention or traveling time of the gas in the slag, and the average foam life ( τ). The effects of P2O5, S, MgO, and CaF2 on foaming were studied. As expected, slag foaming increased with increasing viscosity and decreasing surface tension. It was found that suspended second-phase solid particles such as CaO, 2CaO SiO2, and MgO stabilized the foam and had a larger effect on foaming than changes in viscosity and surface tension for the slags studied.

    DOI DOI2

  • Study on the foaming of CaO-SiO2-FeO slags: Part II. Dimensional analysis and foaming in iron and steelmaking processes

    Kimihisa Ito, R. J. Fruehan

    Metallurgical Transactions B   20 ( 4 ) 515 - 521  1989.08

    　View Summary

    An empirical equation for the foaming index Σ of a CaO-SiO2-FeO slag was obtained by dimensional analysis. The effect of second-phase particles on slag foaming was well described by calculating the viscosity of the mixture using the modified Einstein equation. The anticipated foaming in basic oxygen furnace (BOF), electric arc furnace (EAF), and bath-smelting processes was estimated using the parameter Σ for various operating conditions and slag compositions. For BOF operations, it is predicted that foaming is most extreme in the middle of the blow, and a stable foam in EAF is achieved with less basic slags with low FeO contents. For bath smelting, foam heights of 5 m are possible, and a higher degree of prereduction prior to smelting will reduce foaming (because of smaller gas evolution) and possibly increase production rates. Running the process at a higher pressure will also reduce foam heights, because the volume of gas generated is less.

    DOI DOI2

  • Thermodynamics of nitrogen in CaO-SiO2-AI2O3 slags and its reaction with Fe-Csat. melts

    Kimihisa Ito, R. J. Fruehan

    Metallurgical Transactions B   19 ( 3 ) 419 - 425  1988.06

    DOI DOI2

  • Phosphorus Distribution between Basic Slags and Carbon- saturated Iron at Hot-metal Temperatures

    ITO Kimihisa, SANG Nobuo

    Transactions of the Iron and Steel Institute of Japan   25 ( 5 ) 355 - 362  1985

    DOI DOI2 CiNii

▼display all

Books and Other Publications

  • 基礎材料科学

    伊藤, 公久, 平田, 秋彦, 山本, 知之

    コロナ社  2020.10 ISBN: 9784339066524

  • Thermodynamic data for steelmaking

    日野, 光兀, 伊藤, 公久

    Tohoku University Press  2010 ISBN: 9784861631290

  • 速度論

    伊藤, 公久

    八千代出版  2003.02 ISBN: 4842912626

  • 熱力学 : マテリアルサイエンスの基礎

    伊藤, 公久

    八千代出版  2000.02 ISBN: 484291128X

Research Projects

  • Numerical simulation of the erosion and the destruction of the refractories used in high temperature processes.

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2021.04
    -
    2024.03
     

    Ito Kimihisa

    　View Summary

    The simulation program for the dissolution and fracture phenomena of refractories was developed and the following results were obtained: 1) The simulation program for the dissolution of solids using the particle method was developed and compared with the results of a cold model experiment for the verification on the same scale, and it was confirmed that the simulator could sufficiently reproduce the experimental results. 2) A simulation program for the drying fracture phenomena of castable refractories using the particle method was developed. Compared with the verification experiment using a high-temperature drying cell, the developed simulator was able to sufficiently reproduce the crack propagation of CaCO3-water paste at high temperatures.

  • Development of the multi-phase thermal fluid simulator for the analysis of high temperature processes.

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2017.04
    -
    2020.03
     

    Ito Kimihisa

    　View Summary

    The numerical simulator for the analysis of thermo-fluid in metallurgical processes was developed. The obtained results are as follows: 1) CFD program for non-Newtonian fluids was developed and applied to analyze the heat recovery process of steelmaking slags. 2) The gas-liquid two-phase flow simulator using XSPH method for the prediction of rising bubbles and the gas jets impinging onto the molten metal bath. Additionally, the heat transfer and expansion effects were considered. 3) The heat transfer equations and chemical reaction rates were coupled the developed simulator, which was applied to the simulation of the thermal decomposition of partially calcined CaCO3 particles driven into a molten metal bath.

  • A study on the non-equilibrium statistical mechanics of particle methods based on Hamiltonian mechanics

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2011.04
    -
    2015.03
     

    SUZUKI Yukihito, SHIBATA Yoshihiro, YOSHIMURA Hiroaki, ITO Kimihisa

    　View Summary

    A particle method based on the GENERIC formalism which is a theoretical framework for non-equilibrium thermodynamics has been studied. Indeed, a particle method based on the Poisson bracket defined on the state space of the Eulerian description of fluid flow has been developed and some numerical experiments have been done. In addition, the two-dimensional vorticity equation has been formulated within the GENERIC formalism and discretized using the discrete variational derivative method. The thus-obtained numerical method preserves or dissipates the kinetic energy and enstrophy depending on whether the flow is inviscid or viscid

  • ナノ粒子添加による超高度金属材料の創成

    文部科学省 

    Project Year :

    2000
    -
    2004
     

  • Zn removal from aluminum alloys

    Project Year :

    1999
    -
    2001
     

  • The innovative iron and steelmaking process harmonized with environment

    Project Year :

    1996
    -
    2000
     

  • The control of nucleation

    Project Year :

    1997
    -
    1998
     

  • Development of C60 Synthesis Process Using Extended Arc.

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    1993
    -
    1995
     

    ITO Kimihisa

    　View Summary

    The synthesis process of C60 using extended arc was developed in this research. The arc was stabilized and extended by injecting helium gas with relatively high flow rate, which was larger than those used in the conventional fullerene production process by an order of magnitude. The analytical method of C60 and C70 was refined and the concentrations of them were precisely determined. The collector was separated into four parts and the collection efficiency was measured in the experiment. The production ratio of C70 to C60 was 20-50%, which was higher than the reported value (about 10%). The flow pattern of gas and the temperature distribution in the reactor was numerically calculated by a computer simulation. The result shows that the CO-axial gas injection enhances the deposition of graphite on the cathode and the vortex is generated at the lower part of the collector.The usage of the liquid organic compounds as the source of fullerenes was tested using the same equipment. However, the steady arc was not obtained in all the runs, which suggests that the much larger current capacity is needed for this purpose

  • 超臨界水を用いた希土類酸化物超微粒子および薄膜の製造

    日本学術振興会  科学研究費助成事業

    Project Year :

    1990
    　
    　
     

    伊藤 公久

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    超臨界状態の水を用いた素材製造プロセスの一例として、希土類化合物の超微粒子・薄膜の製造に関する研究を行なった。まず、製造条件を明らかにするために、超臨界状態の水を高密度のガスと見なし、希土類化合物が超臨界状態の水中に蒸発し、水分子を配位して分子状で溶ける溶解モデルを考えた。超臨界流体中における希土類化合物の溶解度を状態方程式を用い熱力学モデルにおいて、相互作用パラメ-タa_<12>を用いて比較的良く実験結果を再現することができた。さらにこの熱力学モデルをシリカに関して適用した結果、モデルの有効性が確認された。次いで、水酸化ランタンが溶解している超臨界溶液をノズルを通して急速膨張させることにより超微粒子を生成させた。この粉末は加熱によって、容易に酸化物となる。生成粒子の平均粒径は、ノズル径には依存せずに、圧力の増加に伴い大きくなった。これは、超臨界溶液中の溶質濃度が増加するためと考えられる。超臨界溶液の急速膨張による溶質の析出機構を考察した結果、急速膨張による等エントロピ-領域での状態量は急激な減少によって、水滴核が形成することが推測された。このため溶媒(水滴)の溶解力が急激に低下して、溶媒中の溶質が過飽和状態になり、水酸化ランタンの不均一核生成が起こると考えられる。急速膨張プロセスでは、液滴の生成が溶質の析出よりも早いため、薄膜を作ることはできなかった。また、超臨界水中での薄膜生成速度の推定計算を行なった結果、溶解度を大きく増加させるエントレイナ-の使用が必要であろうとの結論に達した

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Sub-affiliation

  • Faculty of Science and Engineering   Graduate School of Fundamental Science and Engineering

Research Institute

  • 2024
    -
    2026

    Kagami Memorial Research Institute for Materials Science and Technology   Concurrent Researcher

  • 2024
    -
    2026

    Waseda Research Institute for Science and Engineering   Concurrent Researcher

  • 2024
    -
    2025

    Waseda Center for a Carbon Neutral Society   Concurrent Researcher

Internal Special Research Projects

  • 製鉄プロセスにおける未利用顕熱回収プロセス構築のための非Newton熱流体シミュレータの開発

    2018  

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    鉄鋼産業のCO2排出量は我が国全体の13%を占めている。この大量のCO2削減のため、高温のエネルギーを持つ製鋼スラグからの顕熱回収プロセスの開発は重要である。プロセスの最大の問題は、凝固の進行に伴う固相率の増加によって非ニュートン流体の挙動を示す製鋼スラグの流動性予測とその制御である。本研究では自由界面の変形予測に適したSPH（Smoothed Particle Hydrodynamics）法に擬塑性流体およびビンガム流体の粘性モデルを導入した流体シミュレータを開発し、スラグ－冷却ロール間の界面熱抵抗を考慮した伝熱プログラムを連成することで、プロセスシミュレータを完成させ、パイロットスケールでの試験結果と良い一致を見た。

  • 高温反応プロセス解析のためのマルチフェーズ熱流体シミュレータの開発

    2017  

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    数値流体力学の代表的なLagrange手法の一つであるSPH法を用いて、熱流体解析プログラムの開発を行った。本年度は、高速GPGPU（P-100）を３基導入し、高速かつ大規模な計算が可能となった。主たる成果は以下の通りである。① XSPH法を導入した気液混相流の詳細シミュレーションに成功し、上昇気泡の形状予測や高速ガスジェット吹付による液面変動の再現が可能となった。②流体プログラムに伝熱及び化学反応を連成させることで、溶融鉄浴中に打ち込まれた炭酸塩の熱分解シミュレーションを行い、焼成条件の効果を予測した。③ 凝固析出を伴う高粘性混相流の解析プログラムを開発し、溶融スラグの顕熱回収プロセスのシミュレーションを行い、実機と良い一致を見た。