Search Results 1-20 of 120

  • Thermal Oxidation Behavior of Magnesium Silicide with Added Alumina or Aluminum

    Nakada Yoshinobu

    … The depth profile of the samples after thermal oxidation in the E-SEM was evaluated by X-ray photoelectron spectroscopy (XPS). … The dimensionless figure of merit of Sb-doped Mg<sub>2</sub>Si with added Al<sub>2</sub>O<sub>3</sub> …

    MATERIALS TRANSACTIONS, 2021

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  • Validation of dimensionless method using height average wind velocity for wind forces

    Kume Kenichi , Bielicki Sebastian , Kobayashi Hiroshi , Ohba Hiroki

    … The normalization with the HAWV provides flexibility in CFD calculation settings and in the same in modeling wind profile demanded for estimation of the wind forces. …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 31(0), 39-46, 2020

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  • Analysis of the spherical shock wave in a rarefied polyatomic gas based on extended thermodynamics  [in Japanese]

    NAGAOKA Reishi , TANIGUCHI Shigeru

    … It is shown that the similarity solutions are characterized by a dimensionless parameter and the dynamic pressure can essentially contribute to the profile of the physical quantities.</p> …

    The Proceedings of Conference of Kyushu Branch 2019.72(0), E34, 2019

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  • Incorporating suction in to stability charts for unsaturated soil slopes

    Vo Thanh , Russell Adrian R.

    … It is shown that a stable curvilinear slope profile is uniquely governed by dimensionless parameters. … The charts are presented using these dimensionless parameters and may be used in the preliminary design of stable curvilinear slopes. …

    Japanese Geotechnical Society Special Publication 7(2), 139-147, 2019

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  • CHARACTERISTICS BOUNDARY LAYER AND BOTTOM SHEAR STRESS BENEATH TSUNAMI WAVES  [in Japanese]

    TANAKA Hitoshi , TINH Nguyen Xuan , SONG Wenzheng

    2010年チリ地震の際にモントレー湾口水深9mで計測された流速分布をもとに,津波の底面境界層特性に関する検討を行った.その結果,観測結果は通常想定される定常流速度分布と大きく異なり,むしろ風波の波動境界層の特性を示すことが分かった.そこで,波動乱流境界層厚に関する実験式をもとに,津波のもとで使用すべき抵抗則を判断するための条件式を理論的に導出した.それに基づいて仮想的な津波の浅水変形過程における境 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_313-I_318, 2018

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  • Three-dimensional numerical analysis of magnetohydrodynamic flow bounded by conducting walls under alternating-current magnetic fields  [in Japanese]

    MURE Yoshiteru , KOHNO Haruhiko

    … It is confirmed that the spatio-temporal mean Lorentz force in the conducting fluid becomes weaker with the increase in the dimensionless frequency due to the skin effect. … It is also shown that the flow pattern in a hexahedral closed domain is largely changed when the frequency is getting higher, which is associated with the change in the Lorentz force profile.</p> …

    Transactions of the JSME (in Japanese) 84(863), 17-00589-17-00589, 2018

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  • Poiseuille flow over a wavy surface

    Simon J. Haward , Amy Q. Shen , Jacob Page , Tamer A. Zaki

    … The glass channels are fabricated by the method of selective laser-induced etching, which allows them to be made with a high (quasi-2D) aspect ratio (width/depth, w/2d=5) and with an accurate wave profile of small relative amplitude (A/d=0.05,A<k). … 414, 195 (2000)], we examine the influence of two dimensionless parameters (the normalized channel half-depth α=kd and the viscous length scale θ) on the penetration depth P of the perturbations that the wavy surface induces to the Poiseuille base flow. …

    Physical Review Fluids 2(12), 124102, 2017-12-08

    IR 

  • A Critical Condition for Overfill-to-Starve Transition of Doctor-Bladed Liquids in Gravure Coatings

    Miura Hidenobu , Tsuruoka Ayumi , Yamamura Masato

    … whereas, it exhibits a concave surface profile in each groove at high speeds, i.e. a starved configuration with a partial filling of the groove. … The dimensionless volumes of residue on the roll obeyed a master curve with respect to a balance between the pressure-driven and viscous drag flows. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 50(4), 262-267, 2017

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  • EXPERIMENTAL STUDY ON THE ROLL WAVES FLOW VELOCITY AND PERIODIC PROPERTIES  [in Japanese]

    MIYAJIMA Masahiro , MIZUTANI Natsuki

    この論文は,転波列流れに関する流速と周期について実験的に検討したものである.転波列研究に関してこれまで具体的に実験結果を踏まえて議論された研究は数少ない.本文では,まずPIV手法を用いた内部流速についての知見を示し,次に超音波式距離計を用いた実験を行って周期特性を明らかにしている.実験の結果,転波列流れが対数則分布より速い流速値を示していること,そして周期の発生要因については摩擦速度と粘性底層厚が …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_727-I_732, 2017

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  • SOME ANALYTICAL GUIDELINES TO DEFINE OPTIMUM PROFILE RELIEF IN NARROW-FACED SPUR AND HELICAL GEARS  [in Japanese]

    VELEX Philippe , BRUYÈRE Jérôme

    … <p>Based on analytical developments, it is found that families of profile modifications can render transmission error nearly constant which can be represented by so-called dimensionless master curves. … These analytical findings compare well with the quasi-static numerical optimal profile relief obtained by coupling a lumped parameter model and a genetic algorithm. …

    The Proceedings of the JSME international conference on motion and power transmissions 2017(0), 04-07, 2017

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  • Stability Analysis of Rotating-Disk Flows with Uniform Suction

    ITOH Nobutake

    … Applying uniform suction from the surface brings a small parameter associated with displacement thickness of the circumferential velocity profile into a dimensionless form of the equation system. … Two kinds of series solutions expanded by the powers of this parameter are obtained to describe the cross-flow and centrifugal instabilities of the flow having a twisted velocity profile. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 60(1), 27-34, 2017

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  • Bifurcation curves in a combustion problem with general Arrhenius reaction-rate laws

    Taira Kazuaki , 平良 和昭

    … We prove that ignition and extinction phenomena occur in the stable steady temperature profile at some critical values of a dimensionless rate of heat production. …

    Annali dell' Università di Ferrara 62(2), 337-371, 2016-11

    IR 

  • A STUDY ON SEMI-DISPLACEMENT VENTILATION USING IMPINGING JET FLOW:- Prediction of vertical temperature distribution using block model based on numerical experiment by CFD -  [in Japanese]

    KOBAYASHI Tomohiro , SUGITA Kazuki , UMEMIYA Noriko

    … The final objective of this work is to establish a simplified prediction method of vertical temperature profile. … The correlation between key dimensionless number regarding important design conditions and the turbulent thermal diffusivity are finally shown. …

    Journal of Environmental Engineering (Transactions of AIJ) 81(730), 1117-1125, 2016

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  • F221 Measurement of liquid velocity in gas-liquid two-phase flow in a 2x2 rod bundle  [in Japanese]

    OGAWA Yuma , HOSOKAWA Shigeo , TOMIYAMA Akio

    … (2) Local wall shear stress on the rod wall depends on the azimuthal localtion, and the distributions of dimensionless liquid velocities near the wall in inner subchannel agree with the universal dimensionless mean velocity profile of wall turbulence. …

    The Proceedings of the National Symposium on Power and Energy Systems 2014.19(0), 369-370, 2014

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  • Numerical Simulations of a Bubble Rising through a Shear-Thickening Fluid

    Ohta Mitsuhiro , Kimura Sachika , Furukawa Tomohiro , Yoshida Yutaka , Sussman Mark

    … The viscosity profile around the rising bubble is derived from numerical data, and it facilitates the determination of the shear-thickening effects as a function of the power-law exponent <i>n</i>. … For different values of <i>n</i>, the effective viscosity and the associated effective physical dimensionless numbers are determined in order to quantify the shear-thickening effect of the continuous phase fluid on the bubble rise motion. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 45(9), 713-720, 2012

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  • Diffusion in Flow and Porous Catalyst Part inside Microreactors for Heterogeneous Catalytic Reactions  [in Japanese]

    KATAOKA Sho , TAKEUCHI Yasutaka , HARADA Atsuhiro , YAMADA Mitsuhiko , OHMORI Takao , ENDO Akira

    触媒層を内壁に有するマイクロリアクターにおいて,フロー部と触媒層に分けて拡散の影響を評価し,不均一触媒反応を効果的に行う条件について検討した.フロー部ではマイクロリアクター内壁でのみ反応が起こるとして,半径方向の物質移動を考慮に入れた反応器モデルを用いた.このモデルはDamköhler数と変形Péclet数を含む無次元式で表され,リアクター内の濃度分布を求めることで拡散の影 …

    KAGAKU KOGAKU RONBUNSHU 37(5), 420-425, 2011-11-20

    J-STAGE  References (18)

  • S056034 Numerical Analysis of Liquid Crystal Flow between Parallel Plates Using Orientational Distribution Function  [in Japanese]

    CHONO Shigeomi , TSUJI Tomohiro

    … At dimensionless timet^*=5.875, the order parameter remarkably decreases and the preferred angle is almost perpendicular to the main flow direction near the channel wall, so that the velocity profile is sharpened compared with the steady state profile at t^*=8.0. …

    The Proceedings of Mechanical Engineering Congress, Japan 2011(0), _S056034-1-_S056034-4, 2011

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  • Tumbling motion of a single chain in shear flow: A crossover from Brownian to non-Brownian behavior

    Kobayashi Hideki , Yamamoto Ryoichi

    … The chain is represented by a bead-spring model and the smoothed profile method is used to accurately account for the effects of thermal fluctuations and hydrodynamic interactions acting on beads due to host fluids. … It was observed that the chain undergoes tumbling motions and that its dimensionless frequency F=6πησ3ν/kBT depends only on the Peclet number Pe with a power law F∝Peα, where kB is the Boltzmann constant, T is the temperature, and σ is the diameter of the beads. …

    Physical Review E 81(4), 2010-04-26

    IR 

  • Effects of Pathological Conditions on Ocular Pharmacokinetics of Antimicrobial Drugs

    Ueda Kayoko , Ohtori Akira , Tojo Kakuji

    … The barrier capacity of the surrounding membranes such as the retina/choroid/sclera (RCS) membrane and the cornea was characterized by dimensionless Sherwood number derived by the pseudo-steady state approach (PSSA). … data agreed with the simulated profile without contradiction. …

    Chemical and Pharmaceutical Bulletin 58(10), 1301-1305, 2010

    J-STAGE  Ichushi Web 

  • Tolerance Design of Logarithmic Roller Profiles in Cylindrical Roller Bearings

    FUJIWARA Hiroki , YAMAUCHI Kazuto

    … A logarithmic profile is essentially optimal crowning geometry for rolling machine elements such as bearing rollers and raceways. … Although some design methods of the profile have been proposed, they do not refer to the tolerance of the geometry required in engineering applications and in production. … This paper shows how to define the tolerance range associated with the optimum roller profile, previously suggested by one of the authors. …

    Journal of Advanced Mechanical Design, Systems, and Manufacturing 4(4), 728-738, 2010

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