Search Results 1-20 of 222

  • Simulation of the Initiation and Motion of Seismically Induced Aso-Ohashi Landslide During the 2016 Kumamoto Earthquake

    Shi X , Jiang Y

    … A finite difference method (FDM) model is set up by the true terrain data. … In order to verify that only the steeply dipping region was moved due to earthquake, a GIS (Geographic Information System)-based depth average Bingham model which estimates the movement of slide mass is presented. …

    Tehnicki vjesnik - Technical Gazette 27(6), 2044-2052, 2020-12

    IR 

  • RHEOLOGICAL CONSTANTS MEASUREMENT OF MORTAR THAT FLUIDITY IS EVALUATED BY SLUMP AND ANALYSIS OF SLUMP AND SLUMP FLOW OF MORTAR BY MPS METHOD  [in Japanese]

    HIRANO Syuya , YAMADA Yoshitomo , NISHI Hironobu , SAKIHARA Kohei

    … It was confirmed that the flow curves of all mortar samples were able to be approximated by the Bingham model under all shear conditions. … And the obtained flow curve was approximated by the Bingham model, and the rheological constants of all mortar sample was determined. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (774), 993-1003, 2020-08

    J-STAGE  AIJ  AIJ 

  • SLUMP FLOW SIMULATION OF HIGH FLUIDITY CONCRETE BY MPS METHOD  [in Japanese]

    YAMADA Yoshitomo , UEHARA Yoshiki , SAKIHARA Kohei , URANO Shinji

    … First, the flow of Bingham fluid between parallel plates was analyzed, and the validity of the analysis method was verified. … were used for the rheological constants (yield value, plastic viscosity) of concrete used for slump flow analysis.</p><p> The results obtained in this study can be summarized as follows.</p><p> The flow of Bingham fluid between parallel plates was reproduced using the proposed MPS analysis. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (771), 663-672, 2020-05

    J-STAGE  AIJ 

  • Viscosity of Slag Suspensions with a Polar Liquid Matrix

    Saito Noritaka , Hara Daigo , Teruya Seiyu , Nakashima Kunihiko

    … The trend of increasing viscosity of the molten slag suspensions with dispersed CaO and MgO particles was similar to that of the room-temperature suspensions, exhibiting Bingham non-Newtonian behavior. … The viscosity model composed with the results from the glycerol aqueous suspensions underestimated the slag viscosity, which can be attributed to the repulsive forces in the high-polarity liquid matrix.</p> …

    ISIJ International 60(12), 2807-2818, 2020

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  • STUDY OF DRAG FORCE TO FALLING SPHERES IN CARRIER MATERIALS (MIXTURE OF VISCOUS FLUID AND FINE PARTICLES) FOR ORE LIFTING TECHNOLOGY AND INTERPRETATION OF RHEOLOGICAL CONSTANTS  [in Japanese]

    ORITA Kiyotaka , TANI Kazuo , KOSHO Tetsushi , SUZUKI Akihiko , TANAKA Keiichi

    <p>　著者らは，粗粒かつ高密度の海底鉱物資源を海底から海面まで効率的に揚鉱するためにキャリア物質（粒状体を含む粘性流動体，以下CM，Carrier Material）を用いた方式を提案している．効率的な揚鉱を可能とするCMを選定するためには，揚鉱管内で鉱石の沈降を抑制する性能（材料分離抵抗性）を評価する必要がある．そこで，球の沈降実験装置を作製して，球の沈降速度<i>ν& …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76(2), I_881-I_886, 2020

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  • Numerical Simulation of Coexisting Solid-liquid Slag Trickle Flow in a Coke Bed by the SPH Method with a Non-Newtonian Fluid Model

    Natsui Shungo , Sawada Akinori , Nogami Hiroshi , Kikuchi Tatsuya , Suzuki Ryosuke O.

    … <p>A simulation of the dripping behavior of solid-phase suspended molten slag in a coke bed was performed using the Bingham fluid model in the framework of smoothed particle hydrodynamics (SPH). … slag, with suspended solids approximated by the Bingham fluid model, and the holdup droplets were trapped at approximately the same site regardless of the yield value. …

    ISIJ International 60(7), 1445-1452, 2020

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  • Flow Analysis and Approximate Expressions of Factors Related to Frictional Loss for Laminar Flow of Viscoplastic Fluids through a Concentric Annulus  [in Japanese]

    HATAKEYAMA Nobuo , SHIMIZU Yoshiyuki , MASUYAMA Tadashi

    … In recent years, the Herschel-Bulkley rheological model is recommended as a general fluid model of drilling mud because it encompasses the power law model and the Bingham plastic model. … For studies on laminar flow of viscoplastic fluids (fluids with yield stress) through concentric annuli, there are researches on Bingham fluid by Fredrickson & …

    Journal of MMIJ 136(5), 40-51, 2020

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  • X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation

    Noda Takashi , Shibasaki Kenichi , Miyata Shinji , Taniguchi Masato

    … Hydrodynamic feature of grease was regarded as a non-Newtonian fluid, which shows a highly non-linear flow curve, and the constitutive equation of modified Bingham plastic model proposed by Papanastasiou was applied to rheological property. …

    Tribology Online 15(1), 36-44, 2020

    J-STAGE 

  • RHEOLOGICAL CONSTANTS MEASUREMENT OF CEMENT PASTE AND CEMENT PASTE FLOW ANALYSIS BY MARKER PARTICLE VISCO-PLASTIC FINITE ELEMENT METHOD  [in Japanese]

    YAMADA Yoshitomo , HIGASHIFUNAMICHI Yusuke , UEHARA Yoshiki , SAKIHARA Kohei

    … It was confirmed that the flow curves of all cement paste samples can be approximated by the Bingham model under all shear conditions. … And the obtained flow curve was approximated by the Bingham model, and the rheological constants (yield value and plastic viscosity) of the paste sample was determined. … The obtained flow constitutive equation considers non-Bingham characteristic, flow history, and pressure dependency of yield value. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (756), 139-148, 2019-02

    IR  J-STAGE  AIJ 

  • Optimal Design of Magnetorheological Fluid Clutch for Haptics Device  [in Japanese]

    KIKUCHI Takehito , ABE Isao

    … Three different MRFs are modeled with Bingham fluid model in off-state and on-state. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 1P2-B14, 2019

    J-STAGE 

  • Numerical analysis of dam breaking behavior of Bingham pseudoplastic fluid by using the explicit MPS method  [in Japanese]

    NEGISHI Hideyo , AMAKAWA Hiroaki , MANIWA Kazuaki , OBARA Shingo , HAYAMA Makoto , DONG Daming

    … As for the numerical work, a basic algorithm to simulate non-Newtonian grease macro flows was developed based on the explicit MPS (Moving Particle Simulation) method coupled with Bingham pseudoplastic fluid model. …

    Transactions of the JSME (in Japanese) 85(875), 19-00086-19-00086, 2019

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  • Flow Characteristics of Slurry with Rare-Earth Rich Mud under Deep Seabed around Minamitorishima  [in Japanese]

    SHIMIZU Yoshiyuki , HATAKEYAMA Nobuo , HANAMURA Eigo , WATANABE Kazuo , YOKOYAMA Yuka , MASUYAMA Tadashi

    … Further, three types of fluid model; … the Power low model, the Bingham-Papanastasiou model and the Herchel-Bulkley-Papanastasiou model were fitted on the data using the least square techniques, then compared with each other. …

    Journal of MMIJ 135(7), 52-62, 2019

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  • Experimental Study on the Viscosity of Stainless Steelmaking Slags

    Liu Zhuangzhuang , Dekkers Rob , Blanpain Bart , Guo Muxing

    … The results are discussed by considering the Iida model for the fully liquid slag and the Herschel-Bulkley equation for the solid-bearing slag. … For the liquid slag, the predicted viscosity values by the original Iida model do not agree very well with the measured ones, because the model does not include the amphoteric behavior of Cr<sub>2</sub>O<sub>3</sub> …

    ISIJ International 59(3), 404-411, 2019

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  • Spreadsheet Solutions for Rheological Properties and Viscoplastic Fluid Flow in Circular Pipes and in Parallel-plates  [in Japanese]

    HATAKEYAMA Nobuo , SHIMIZU Yoshiyuki , MASUYAMA Tadashi

    … <p>The rheological properties of cement slurries (including fresh concrete and high concentration paste for filling etc.) are complicated, therefore they are approximated by the Bingham plastic model. … In recent years, the application of Herschel-Bulkley model is recommended for drilling mud. … Therefor it is essential to properly select the model in order to design the slurry transportation. …

    Journal of MMIJ 135(2), 15-24, 2019

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  • Method for estimating the end of the deflation initiated in 2014 at Sinabung volcano, Indonesia, under the assumption that the magma behaves as a Bingham fluid

    Hotta Kohei , Iguchi Masato , Ohkura Takahiro , Hendrasto Muhamad , Gunawan Hendra , Rosadi Umar , Kriswati Estu

    … We herein estimated the end of the ongoing deflation at Sinabung volcano, Indonesia, which began in 2014 under the assumption that the magma is incompressible and behaves as a Bingham fluid. … Next, we obtained the absolute pressure in the reservoir as a function of time by modeling the magma as an incompressible fluid inside a spherical reservoir with a cylindrical vent and applying the estimated volume change function to the model. …

    Earth, Planets and Space (70), 2018-07-03

    IR 

  • Fluid structure interaction analysis of snow avalanches using non-Newtonian fluid model  [in Japanese]

    高瀬 慎介 , 森口 周二 , 寺田 賢二郎

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science 23, 4p, 2018-06

  • Pitfalls of Pro‑Organizational Behavior::Theories and Research on Unethical Pro‑Organizational Behavior (UPB)  [in Japanese]

    Kitai Akira , Suzuki Ryuta , Uenoyama Tatsuya , Matsumoto Yuichi

    <p>　本論文の目的は，近年組織行動論で注目され始めている非倫理的向組織行動（Unethical Pro-organizational Behavior：UPB）を理論的に検討することである．蓄積されつつあるUPBの先行研究をレビューし，UPB概念と他の類似概念との違い，社会心理的メカニズム，およびUPBを扱った経験的研究の内容について整理する．そのあとで今後のUPB研究の発展に資する …

    Organizational Science 52(2), 18-32, 2018

    J-STAGE 

  • A HAZARD MAP BASED ON 3D SNOW AVALANCHE SIMULATION  [in Japanese]

    KITOU Kouhei , KOTANI Takuma , YAMAGUCHI Yuya , TAKASE Shinsuke , MORIGUCHI Shuji , TERADA Kenjiro

    本研究では，SUPG/PSPG法に基づく3次元非構造四面体メッシュを用いた安定化有限要素法による雪崩解析の結果と従来の雪崩衝撃力算出式を組み合わせることによって，3次元地形情報による雪崩挙動への影響を加味した上で，雪崩の衝撃力による空間的な対人的危険度を簡便に表現しうる評価マップを作成するための手法を構築した．数値解析においては，雪をせん断応力がせん断速度に依存するビンガム流体と仮定し，内部摩擦角 …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 74(2), I_203-I_211, 2018

    J-STAGE 

  • Design method of thermal connector for electronic equipment cooling  [in Japanese]

    HAYASHI Tomoo , KONDO Yoshihiro , TOYODA Hiroyuki , SATO Shigemasa , TSUBAKI Shigeyasu

    … Firstly, the insertion force was theoretically calculated using the Bingham plastic model for rheology characteristics of the thermal grease and the slip model on the surfaces of the thermal plug and the thermal socket. …

    Transactions of the JSME (in Japanese) 83(850), 16-00580-16-00580, 2017

    J-STAGE 

  • FLOW SIMULATION FOR EVALUATION OF FILLING-ABILITY OF FRESH CONCRETE WITH VIBRATION  [in Japanese]

    URANO Shinji , NEMOTO Hiroshi , YAMADA Yoshitomo , SAKIHARA Kohei

    本研究は，流動解析手法による実際の構造物を対象とした施工性の評価方法の確立を目的として，粒子法の1つであるMPS法を適用し，通常のスランプのコンクリートの流動解析手法としてのMPS法の有効性ついて検討を行った．スランプのコンクリートの構成則をbi-viscosityモデルとし，バイブレータ周辺の加速度分布に依存して，加振されていない場合と比較して，見掛け上降伏値と塑性粘度が低下する流動モデルを適用 …

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 73(2), 179-190, 2017

    J-STAGE 

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