研究活動情報

• Carbon Nanotube Synthesis via the Calciothermic Reduction of Carbon Dioxide with Iron Additives
  Tatsuya Kikuchi; Ryoma Ishida; Shungo Natsui; Takehiko Kumagai; Isao Ogino; Norihito Sakaguchi; Mikito Ueda; Ryosuke O. Suzuki
  ECS SOLID STATE LETTERS, 4, 9, M19, M22, 2015年, ［査読有り］
  英語, 研究論文（学術雑誌）
• 減圧環境における上昇気泡の数値解析
  姫野 武洋; 熊谷 剛彦
  鉄と鋼, 101, 2, 109, 116, 2015年, ［査読有り］
  日本語, 研究論文（学術雑誌）
• 液中浮上時の気泡挙動の数値解析
  中村 修; 熊谷 剛彦; 髙谷 幸司
  鉄と鋼, 101, 2, 117, 122, 2015年, ［査読有り］
  日本語, 研究論文（学術雑誌）
• 密閉容器内における粘性流体中を上昇する単一気泡に関する数値流体解析
  田川 俊夫; 安西 洋平; 熊谷 剛彦
  鉄と鋼, 101, 2, 101, 108, 2015年, ［査読有り］
  日本語, 研究論文（学術雑誌）
• 減圧密閉容器内を上昇する気泡の観察
  熊谷 剛彦; 岸本 康夫; 中村 修; 田川 俊夫; 姫野 武洋; 嶋﨑 真一
  鉄と鋼, 101, 2, 93, 100, 2015年, ［査読有り］
  日本語, 研究論文（学術雑誌）
• Stable mesh-free moving particle semi-implicit method for direct analysis of gas-liquid two-phase flow
  Shungo Natsui; Hifumi Takai; Takehiko Kumagai; Tatsuya Kikuchi; Ryosuke O. Suzuki
  CHEMICAL ENGINEERING SCIENCE, 111, 286, 298, 2014年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Multiphase Particle Simulation of Gas Bubble Passing Through Liquid/Liquid Interfaces
  Shungo Natsui; Hifumi Takai; Takehiko Kumagai; Tatsuya Kikuchi; Ryosuke O. Suzuki
  MATERIALS TRANSACTIONS, 55, 11, 1707, 1715, 2014年
  英語, 研究論文（学術雑誌）
• Formation Behaviors of Microchannels in Reactive-Sintered Ni-Al Alloys by Sacrificial-Core Method
  TESHIROGI Yuya; OHMI Tatsuya; KUMAGAI Takehiko; IGUCHI Manabu
  実験力学 : journal of JSEM, 13, s209, s212, The Japanese Society for Experimental Mechanics, 2013年07月01日
  英語, We investigate the effects of process conditions on the formation behavior of microchannels in reactive-sintered Ni-Al alloys as a part of a study to develop a powder-metallurgical process to produce a transpiration-cooling device including microchannel networks for a disaster preventing robot. The microchannel was successfully produced by a sacrificial-core method with a compact specimen composed of Ni and Al elemental powders when a moderate heating pattern was employed for sintering.
• 急縮小部を有する微小流路内気液二相流の気泡速度に及ぼす流路高さの影響
  深澤 慧; 熊谷 剛彦; 大参 達也; 岩井 一彦; 井口 学
  混相流 = Japanese journal of multiphase flow, 27, 2, 168, 174, THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, 2013年06月15日
  日本語, An experimental investigation is carried out on the effects of a sudden contraction on the characteristics of an air-water two-phase flow in a millimeter-scale rectangular channel. The results reveal that the flow pattern transition types caused by sudden contraction can be basically classified into five. The scatter of the leading edge velocity of a bubble observed downstream of the sudden contraction increases as the channel height becomes smaller than a certain critical value. This phenomenon is not beneficial for practical usage of gas-liquid two-phase flows in micro channels.
• Structure Control of Cu-Zn Microchannel Lining Layers with Electrochemical Dissolution
  KOBAYASHI Kazuki; OHMI Tatsuya; KUMAGAI Takehiko; SAKAIRI Masatoshi; IGUCHI Manabu
  実験力学 : journal of JSEM, 12, s213, s216, The Japanese Society for Experimental Mechanics, 2012年07月01日
  英語, The effect of potentiostatic dissolution on the structure of a Cu-Zn alloy microchannel lining layer was investigated. The microchannel lining layer was fabricated by a powder-metallurgical process using copper powder and zinc wire. The lining layer became more porous after potentiostatic dissolution at a constant potential of −0.5 V vs. Ag/AgCl. The lining layer was remarkably dezinced and it contained many open pores under the dissolution condition at +0.5 V. These results indicate the possibility of precise structure control of the microchannel lining layer.
• Fabrication of Free-Form Channels by a combined process of Metal Injection Molding and Sacrificial-Core Method
  SHITARA Yutaro; OHMI Tatsuya; KUMAGAI Takehiko; IGUCHI Manabu
  実験力学 : journal of JSEM, 12, s226, s231, The Japanese Society for Experimental Mechanics, 2012年07月01日
  英語, A novel process has been examined to produce a free-form metal pipe containing thin channels. This process combined a sacrificial-core method and Metal Injection Molding (MIM). MIM compound containing SUS304 stainless steel powder was used as a body compound, and a compound with Cu powder was used as a sacrificial-core compound. These compounds were assembled and injection-molded, and then thermally treated for dewaxing and sintering. With an adequate heating treatment, the sacrificial-core metal migrated to the body-metal region, and thus a channel was successfully produced.
• Composition and Structure Changes in Al_3Ni_2 Microchannel Lining Layers by Alkali Leaching
  SAITOH Yusuke; OHMI Tatsuya; SAKAIRI Masatoshi; KUMAGAI Takehiko; IGUCHI Manabu
  実験力学 : journal of JSEM, 12, s237, s242, The Japanese Society for Experimental Mechanics, 2012年07月01日
  英語, Effects of alkali leaching time on the composition and structure changes in the Al₃Ni₂ microchannel lining layer produced by a sacrificial-core method have been investigated. The composition was measured both on the specimen surface directly exposed to the leachant and on the new surface cut after alkali leaching. In each surface, the decrease in Al concentration became sluggish after formation of Ni₃Al. On the other hand, nano structure consisted of almost pure Ni was detected on the inner wall of the microchannel leached for 864 ks.
• Fabrication of Ni-Al Alloy Transpiration-Cooling Device by Powder-Metallurgical Microchanneling Process
  OMURA Masutaka; OHMI Tatsuya; KUMAGAI Takehiko; IGUCHI Manabu
  実験力学, 11, 0, s272, s275, The Japanese Society for Experimental Mechanics, 2011年
  英語, We examine a concept and fabrication method of a microchannel-type transpiration-cooling device consisting of thermally resistant metals. The device consists of open-porous Ni-Al alloys and contains microchannel networks. Cooling water is supplied from a tank to every corner of the device through the microchannel networks, and then it seeps out to be vaporized absorbing the latent heat. The porous body of the device and the microchannel are produced by a powder-metallurgical microchanneling process using a sacrificial core.
• Gas-Liquid Two-Phase Flow through an Orifice in Millimeter-Scale Rectangular Channel
  OKE Takashi; KUMAGAI Takehiko; Ilegbusi Olusegun J; IGUCHI Manabu
  実験力学, 11, 0, s53, s58, The Japanese Society for Experimental Mechanics, 2011年
  An experimental investigation is carried out on air-water two-phase flow through a plate orifice in a millimeter-scale rectangular channel. The width of the channel is kept constant at 50 mm and the height is varied from 0.19 mm to 2.00 mm. The contraction ratio of the orifice is varied from 0.04 to 0.4, and the thickness of the orifice also is allowed to vary over a wide range. The flow patterns upstream and downstream of the orifice are observed with a high-speed camera and by visual inspection. The conditions for occurrence of the observed flow patterns are presented on a flow pattern map. The velocity of the leading edge of a bubble, representing the bubble velocity, is deduced from the camera images. In the upstream part of the test section the bubble velocity is approximated by the sum of the superficial velocities of air and water. A correlation is proposed for the maximum bubble velocity in the whole test section as a function of the two superficial velocities and the contraction ratio.
• マイクロスケール管路内気液二相流に関する研究動向
  大毛 隆志; 熊谷 剛彦; 井口 学
  Swirl, 4, 1, 26, 30, 旋回噴流システム研究会, 2010年06月
  日本語
• A bouncing droplet on an inclined hydrophobic surface
  Yoshiaki Ueda; Yusuke Sakai; Takehiko Kumagai; Toshio Ishii; Manabu Iguchi
  JOURNAL OF VISUALIZATION, 13, 1, 5, 6, 2010年02月
  英語, 研究論文（学術雑誌）
• Flow Patterns of Gas-Liquid Two-phase Flow through an Abrupt Expansion in Millimeter-Scale Rectangular Channel
  OKE Takashi; KUMAGAI Takehiko; IGUCHI Manabu
  実験力学, 10, 0, s32, s37, The Japanese Society for Experimental Mechanics, 2010年
  英語, The effect of an abrupt expansion on the flow pattern of air-water two-phase flow in a millimeter-scale rectangular channel was investigated. The channel height was fixed as 0.19 mm, 0.50 mm, 1.00 mm and 2.00 mm. The expansion ratio was 5, 2.5, 1.67 and 1.25 for every channel height. The superficial velocity of air was varied from 5.0 cm/s to 80.0 cm/s and that of water was varied from 10.0 cm/s to 80.0 cm/s. As a result, a flow pattern with recirculation zone was observed in the channel height of 2.00 mm and 1.00 mm. This is the same pattern as that in the conventional scale pipes and ducts with an abrupt expansion. Furthermore, there was no effect of an abrupt expansion on the flow pattern when the expansion ratio was close to unity. On the other hand, in the channel height of 0.19 mm, each bubble spread in the lateral direction after it passed through the abrupt expansion. This is an interesting phenomenon in the small channel height.
• ミリスケール扁平矩形流路において気液二相流の流動様式および圧力損失におよぼす流路スケールの影響
  熊谷 剛彦; 井口 学
  Swirl, 2, 3, 10, 13, 旋回噴流システム研究会, 2008年12月
  日本語
• Effects of Channel Gap and Channel Attitude on Flow Pattern of Air-water Two-phase Flow in Rectangular Millimeter-scale Channels
  Kumagai Takehiko; Okuyama Yoshiyuki; Iguchi Manabu
  実験力学 : journal of JSEM, 8, 152, 157, 日本実験力学会, 2008年06月25日
  英語, Effects of channel gap and channel attitude on the flow pattern of gas-liquid two-phase flow in rectangular millimeter-scale gap channels are investigated. The channel gap is varied from 0.5mm to 10.0mm. The observed flow patterns in horizontally placed channels are classified into three categories: bubbly flow, slug flow and annular flow. As the gap becomes small, the bubbly flow regime shifts to the slug flow regime. The boundary between the slug flow regime and the annular flow regime is hardly dependent on the gap. In the bubbly flow regime, the so-called channeling phenomenon of bubbles takes place. Concerning the effects of channel attitude on the flow pattern, a channel with a gap of 1.0mm is mainly used. The inclination angle of the channel is varied from 0° to 90° . The observed flow patterns for a vertically wide channel with an inclination angle of 0° are classified into three categories: bubbly flow, slug flow and stratified wavy flow. Those for an inclination angle of 90° are classified into bubbly flow, slug flow and annular flow. As the inclination angle increases form 0 to about 30°, the bubbly flow regime becomes wide. With a further increase in the inclination angle from about 30° to 90°, it becomes narrow. The slug flow regime changes with an increase in the inclination angle in a complicated manner.
• 扁平矩形流路における気液二相流の流動様式におよぼす壁面撥水性の影響
  熊谷 剛彦; 井口 学
  実験力学, 7, 1, 50, 56, The Japanese Society for Experimental Mechanics, 2007年
  日本語, The flow patterns for gas-liquid two-phase flow have been experimentally investigated using "mm scale" rectangular channels. In this scale the transition of dominant forces from body forces such as the inertial force and buoyancy force to the surface force occurs. The surface force is changed in this study by coating repellent on the inner wall of the channel. The observed flow patterns are basically classified into three categories; bubbly flow, slug flow and annular flow just like those in wetted channels. The boundaries among them, however, become to depend on the wettability of the channel wall as the scale of the channel decreases.
• 部分的な濡れ性変化が微小重力下で形成する液体プラグ長さに及ぼす影響
  吉田 仁; 熊谷 剛彦; 井口 学
  実験力学 : journal of JSEM, 4, 2, 115, 119, 日本実験力学会, 2004年06月25日
  日本語
• Occurrence condition for a swirl motion of a bath agitated by bottom gas injection
  M Iguchi; D Iguchi; Y Sasaki; T Kumagai; S Yokoya
  ISIJ INTERNATIONAL, 44, 10, 1623, 1628, 2004年
  英語, 研究論文（学術雑誌）
• 気泡噴流中の気液間物質移動と気液界面積の評価
  熊谷 剛彦; 井口 学; 中谷 忠稔
  鐵と鋼 : 日本鐡鋼協會々誌, 89, 7, 735, 741, 社団法人日本鉄鋼協会, 2003年07月
  日本語, Experimental investigation was carried out on the gas-liquid mass flux and interfacial area in a bottom blown bubbling jet. The mass flux was measured by two methods in a relatively low gas flow rate regime. One is based on a change in the bubble size and the other is based on a change in the pH in the bath. When the gas flow rate exceeded a certain critical value, the mass transfer coefficient was satisfactorily apporoximated by an previously proposed empirical equation for a clean liquid, regardless of the degree of contamination. An empirical equation was proposed for the total interfacial area in a bubbling jet as a function of the physical properties of fluids and process parameters.
• 垂直円管内水-油系上昇二相流の流動形態に及ぼす濡れ性の影響
  金城 知徳; 井口 学; 熊谷 剛彦
  混相流, 17, 2, 154, 163, 日本混相流学会, 2003年06月15日
  日本語
• 強い乱流中の単一静止気泡からの物質移動
  熊谷 剛彦; 井口 学
  鐵と鋼 : 日本鐡鋼協會々誌, 88, 11, 715, 722, 社団法人日本鉄鋼協会, 2002年11月
  日本語, A single CO_2 bubble was held in a downward highly turbulent flow field realized in a tapered pipe. The dissolution process of the bubble was recorded with a CCD camera and the images were processed on a personal computer to determine the mass transfer coefficient for the bubble. An empirical equation was proposed for the mass transfer coefficient by referring to the previously obtained experimental findings. The equation is expressed as a function of the size of the bubble and the turbulence intensity in addition to the well-known Schmidt number and Reynolds number. The measured values of the mass transfer coefficient were approximated by the equation within a scatter of ±60%. Such estimation accuracy is acceptable in this kind of measurement.
• 乱流に誘起された気液界面上の波動が物質移動におよぼす影響
  熊谷 剛彦; 井口 学; 植村 知正; 米原 紀吉
  鐵と鋼 : 日本鐡鋼協會々誌, 88, 4, 180, 187, 社団法人日本鉄鋼協会, 2002年04月
  日本語, Wave motions appear on the surface of a single-bubble rising in liquid when the bubble Reynolds number exceeds a certain critical value. Such wave motions enhance the mass transfer from the bubble to the liquid especially under the condition that the bubble surface is contaminated by surfactant. This is caused by surface renewal due to the wave motions. The mass transfer coefficient under this condition was experimentally measured using a simplified model. Water and CO_2 gas were used as the working fluids. Two empirical equations for the mass transfer coefficient were proposed.
• 気液界面における二酸化炭素の移動現象の可視化
  赤松 祐也; 米原 紀吉; 植村 知正; 井口 学; 熊谷 剛彦
  可視化情報学会誌 = Journal of the Visualization Society of Japan, 21, 93, 94, 2001年07月01日
  日本語
• 材料プロセスと輸送現象
  井口 学; 木内 弘道; 熊谷 剛彦
  資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan, 117, 4, 2001年04月25日
  日本語
• Instability Phenomena at Bath Surface Induced by Top Lance Gas Injection
  KUMAGAI Takehiko; IGUCHI Manabu
  ISIJ international, 41, S52, S55, The Iron and Steel Institute of Japan, 2001年03月
  英語, Top lance gas injection processes are extensively used in metallurgical engineering. When the exit of the top lance is placed near the bath surface, a downward bubbling jet is generated in the bath. The flow patterns of the downward bubbling jet are classified into seven categories mainly with gas flow rate. Instability phenomena of the bubbling jet appear when the gas flow rate is higher than a certain critical value. The phenomena are strongly dependent on the penetration depth of the bubbling jet into the bath, and hence, an empirical relation is proposed for the penetration depth as a function of the gas flow rate, nozzle diameter and vessel diameter.
• 気液間物質移動におよぼす液流れの影響
  熊谷 剛彦; 井口 学
  鐵と鋼 : 日本鐡鋼協會々誌, 87, 4, 159, 166, 社団法人日本鉄鋼協会, 2001年
  日本語, 研究論文（学術雑誌）
• KClとTiCl_4からのK_2TiCl_6の合成反応特性
  熊谷 剛彦; 近田 昭一; 佐々木 健; 石川 達雄; 千葉 忠俊
  化学工学論文集, 24, 4, 558, 561, The Society of Chemical Engineers, Japan, 1998年07月10日
  日本語, 溶融塩を用いたTiの電解採取や還元製造のための原料塩であるK<SUB>2</SUB>TiCl<SUB>6</SUB>の合成におけるKClと TiCl<SUB>4</SUB>の反応特性を検討した.K<SUB>2</SUB>TiCl<SUB>6</SUB>の合成反応実験では, 種々の粒径のKCl粒子を用い, 過剰のTiCl<SUB>4</SUB>ガスと683Kで接触させた.その結果, 反応速度は反応進行に伴って急速に低下し, 反応は完了前に実質的に停止することが判明した.生成粒子断面のEPMA分析結果から, 反応の停止がK<SUB>2</SUB>TiCl<SUB>6</SUB>の粒子外殻層形成に起因し, 層厚さが5～6μmに達すると起こることがわかった.さらに, これらの結果が生成物層内のTiCl<SUB>4</SUB>ガスの拡散律速を仮定した未反応核モデルにより説明できることを明らかにした.
• NaCl-KCl等モル混合塩におけるTiCl_4の溶解特性
  熊谷 剛彦; 近田 昭一; 佐々木 健; 石川 達雄
  電気化学および工業物理化学 : denki kagaku, 66, 1, 55, 60, 電気化学会, 1998年01月05日
  日本語
• A preliminary experiment of volatilization of minerals in coal ash by chlorination treatment
  Taihei Shimada; Takehiko Kumagai; Takashi Tsurue; Yoshinori Nakata; Takeshi Okutani; Shohei Takeda; Jun-Ichiro Hayashi; Tadatoshi Chiba
  Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy, 76, 2, 134, 144, Maruzen Co. Ltd., 1997年
  英語, 研究論文（学術雑誌）
• 石炭炭化反応中のガス発生特性(<特集>コークスプロセス工学の展開)
  松岡 浩一; 川井 仁; 熊谷 剛彦; 千葉 忠俊
  鐵と鋼 : 日本鐡鋼協會々誌, 82, 5, 383, 387, 社団法人日本鉄鋼協会, 1996年05月01日
  日本語, Changes in mass with time due to gas evolution during carbonization were observed for particles and a cylindrical pellet of various coals heated respectively in a thermogravimetric balance and a microautoclave. The experiments were carried out for a range of the heating rate from 1 to 50K/min, the holding temperature from 673 to 823K and the nitrogen gas pressure of 0.1 and 1.0MPa. Effects of these operating variables on the gas evolution characteristics were experimentally examined. It was demonstrated that the gas evolution characteristics depend on the heating rate and the holding temperature as well as coal nature. Moreover, the total amount of gas evolved at a holding temperature was shown to be independent of the heating rate and to increase with the holding temperature. A simple reaction model is proposed for gas evolution which assumes coal to consist of two components having different reactivities for pyrolysis ; one producing gas along with formation of semicoke via plastic intermediate and the other converting directly to gas. The model parameters were analyzed by fitting the model to the observed results and successfully utilized to explain observed results at different operating conditions.
• 高温塩化物溶融塩中におけるAl_3Ti金属間化合物の生成
  熊谷 剛彦; 近田 昭一; 佐々木 健; 石川 達雄
  電気化学および工業物理化学 : denki kagaku, 64, 4, 296, 300, 電気化学会, 1996年04月05日
  日本語
• Apparent Coal Viscosity Estimated from Needle Penetration into Pellet of Pulverized Coal Particles
  MATSUOKA Koichi; KUMAGAI Takehiko; CHIBA Tadatoshi
  ISIJ international, 36, 1, 40, 44, The Iron and Steel Institute of Japan, 1996年01月
  英語, Needle penetration and volumetric dilation were measured for cylindrical pellets of six kinds of pulverized coal particles using a needle penetrometer. The measurements were conducted for a range of the heating rate from 1 to 20 K/min, the holding temperature from 698 to 823 K and the nitrogen gas pressure from 0.1 to 3.0 MPa. Both needle penetration and dilation characteristics depended on these operating variables. Especially, an appreciable needle penetration occurred at high heating rate for coals which exhibited little softening property at low heating rata. Unreasonably high activation energies for viscosity were obtained when the needle penetration curves were analyzed on the basis of an equation of motion assuming that the pellet behaves as a Newtonian fluid with a temperature dependency of viscosity given by Andrade's equation.
• 鉛電解精製工程のエネルギー計算
  熊谷 剛彦; 千葉 忠俊
  資源・素材, 1995, 57, 58, 1995年09月18日
  日本語

• 「精錬プロセスにおける混相現象」特集号の発刊に寄せて
  熊谷 剛彦, 鉄と鋼, 101, 2, 73, 73, 2015年
  日本語, その他
• 分科会合同ワークショップ2009 : -実験力学における計測・データ処理の問題点・ノウハウ・工夫-参加報告
  西原 一嘉; 熊谷 剛彦, 実験力学 : journal of JSEM, 9, 4, 2009年12月25日
  日本語
• 6^ PSFVIP開催報告
  熊谷 剛彦; 大参 達也; 井口 学, 可視化情報学会誌 = Journal of the Visualization Society of Japan, 27, 106, 41, 41, 2007年07月01日
  日本語

• J0502-2-2 微小流路の急拡大部において流路スケールが気液二相流動様式に及ぼす影響(混相流の多次元ビジュアリゼーション(2))
  熊谷 剛彦; 井口 学
  年次大会講演論文集 : JSME annual meeting, 2009年09月12日, 日本語
  Relationship between the channel height and flow pattern of gas-liquid tow-phase flow in a millimeter-scale rectangular channel has been investigated experimentally. Particular attention is paid to the effect of the channel height on the flow pattern through a sudden expansion. The height is reduced from 2mm to 0.5mm. Some interesting flow patterns are observed with a decrease in the height of the channel. For example, the re-circulating flow commonly observed downstream of the sudden expansion in the conventional scale channel disappears at a height of 0.5mm.
• マイクロスケール矩形流路内において気液二相流における圧力損失におよぼす流路壁面の濡れ性の影響 ([日本実験力学会]2009年度年次講演会)
  熊谷 剛彦; 佐藤 政仁; 井口 学
  日本実験力学会講演論文集, 2009年, 日本語
• ミリスケール矩形流路内の気液二相流の気泡上昇速度に及ぼす傾斜角の影響 ([日本実験力学会]2008年度年次講演会)
  熊谷 剛彦; 磯崎 友香; 井口 学
  日本実験力学会講演論文集, 2008年, 日本語
• 上吹きガス吹き込みに誘起される液-液二相成層流体の旋回現象
  熊谷 剛彦; 井口 学
  材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2004年09月01日, 日本語
• 気体溶解速度に及ぼす気泡噴流の旋回現象の影響
  熊谷 剛彦; 井口 学; TERNSTEDT Patrik; JONSSON Par
  材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年09月01日, 日本語
• 円筒容器内の気液二相噴流の旋回現象と均一混合時間
  設楽 守良; 玉森 匠; 井口 大亮; 吉田 仁; 井口 学; 熊谷 剛彦
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• 急回転する円筒容器内液体の流動特性
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