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Hydrodynamic performance of spouted beds with different types of draft tubes

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Particuology 2013年第5期11卷 475-482页

作者： hiroshi Nagashima Kazumi Suzukawa Toshifumi Ishikura Department of Chemical Engineering Fukuoka University19-1Nanakuma 8-chomeJonan-kuFukuoka 814-0180Japan

Hydrodynamic performance of spouted beds with four different types of draft tubes has been investigated experimentally. In this work, irregular and angular particles were used as the spouting solids and the results were compared with those of the previous work in which regular and round particles had been used. It was found that the conical-cylindrical porous draft tube was the best option for solid-gas contact and solids circulation as in the case of round particles. Moreover, by using conical-cylindrical porous draft tube, the gas flow rate through the annulus reached 65-70%, equal to the level of a conventional spouted bed.

关键词： Spouted bedConical-cylindrical porous draft tubeAngular sandGas-solid contactSolids circulation rate

One-Dimensional Analysis of Supersonic Two-Stage HVOF Process

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Journal of Thermal Science 2009年第4期18卷 332-337页

作者： hiroshi KATANODA Junichi HAGI Minoru FUKUHARA Dept.Mechanical Engineering Kagoshima University

The one-dimensional calculation of the gas/particle flows of a supersonic two-stage high-velocity oxy-fuel(HVOF) thermal spray process was performed. The internal gas flow was solved by numerically integrating theequations of the quasi-one-dimensional flow including the effects of pipe friction and heat transfer. As for the supersonicjet flow, semi-empirical equations were used to obtain the gas velocity and temperature along the centerline. The velocity and temperature of the particle were obtained by an one-way coupling method. The material ofthe spray particle selected in this study is ultra high molecular weight polyethylene (UHMWPE). The temperaturedistributions in the spherical UHMWPE particles of 50 and 150 m accelerated and heated by the supersonic gasflow was clarified.

关键词： Compressible Flow Supersonic Flow Two-Stage HVOF Thermal Spray One-Dimensional Analysis UHMWPE

Experimental Study on Shock Wave Structures in Constant-area Passage of Cold Spray Nozzle

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Journal of Thermal Science 2007年第1期16卷 40-45页

作者： hiroshi KATANODA Takeshi MATSUOKA Kazuyasu MATSUO Dept.Mechanical Engineering Kagoshima University1-21-40 KorimotoKagoshima890-0065 Japan Takagi Precision Dies Co. Ltd.2-4-1 Ishida-MinamiMinami-kuKitakyushuFukuoka802-0836 Japan Dept.Mechanical Systems and Environmental Engineering The University of Kitakyushu1-1 HibikinoWakamatsukuKitakyushuFukuoka808-0135 Japan

Cold spray is a technique to make a coating on a wide variety of mechanical or electric parts by spraying solid particles accelerated through a high-speed gas flow in a converging-diverging nozzle. In this study, pseudo-shock waves in a modeled cold spray nozzle as well as high-speed gas jets are visualized by schlieren technique. The schlieren photographs reveals the supersonic flow with shock train in the nozzle. Static pressure along the barrel wall is also measured. The location of the head of pseudo-shock wave and its pressure distribution along the nozzle wall are analytically explained by using a formula of pseudo-shock wave. The analytical results show that the supersonic flow accompanying shock wave in the nozzle should be treated as pseudo-shock wave instead of normal shock wave.

关键词： Supersonic Flow Pseudo-Shock Wave Jet Flow Cold Spray

Numerical Simulation on Supersonic Flow in High-Velocity Oxy-Fuel Thermal Spray Gun

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Journal of Thermal Science 2006年第1期15卷 65-70页

作者： hiroshi KATANODA Hideki YAMAMOTO Kazuyasu MATSUO The University of Kitakyushu 1-1 Hibikino Wakamatsu-ku Kitakyushu Fukuoka 808-0135 Japan

This paper analyzes the behaviour of coating particles as well as the gas flow both inside and outside of the High-Velocity Oxy-Fuel （HVOF） thermal spray gun by using a quasi-one-dimensional analysis and a numerical simulation. The HVOF gun in the present analysis is an axially symmetric convergent-divergent nozzle with the design Math number of 2.0. From the present analysis, the distributions of veloeity and temperature of the coating particles flying inside and outside of the HVOF gun are predicted. The velocity and temperature of the coating particles at the exit of the gun calculated by the present method agree well with the previous experimental results. Therefore, the present method of calculation is considered to be useful for predicting the HVOF gas and particle flows.

关键词： compressible flow supersonic jet thermal spray HVOF.

Analysis of Particle Behavior in High-Velocity Oxy-Fuel Thermal Spraying Process

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Journal of Thermal Science 2003年第3期12卷 279-282页

作者： hiroshi Katanoda Kazuyasu Matsuo Department of Mechanical Systems and Environmental Engineering Faculty of Environmental EngineeringThe University of Kitakyushu1-1 HibikinoWakamatu-kuKitakyushuFukuoka808-0135JapanDepartment of Mechanical Systems and Environmental EngineeringFaculty of Environmental EngineeringThe University of Kitakyushu1-1 HibikinoWakamatu-kuKitakyushuFukuoka808-0135Japan

This paper analyzes the behavior of coating particle as Well as the gas flow both of inside and outside the High-Velocity Oxy-Fuel (HVOF) thermal spraying gun by using quasi-one-dimensional analysis and numerical simulation. The HVOF gun in the present analysis is an axisymmetric convergent-divergent nozzle with the design Mach number of 2.0 followed by a straight passage called barrel. In the present analysis it is assumed that the influence of the particles injected in the gas flow is neglected, and the interaction between the particles is also neglected. The gas flow in the gun is assumed to be quasi-one-dimensional adiabatic flow. The velocity, temperature and density of gas in the jet discharged from the barrel exit are predicted by solving Navier-Stokes equations numerically. The particle equation of motion is numerically integrated using three-step Runge-Kutta method. The drag coefficient of the particle is calculated by linear interpolation of the experimental data obtained in the past. Particle mean temperature is calculated by using Ranz and Marchalls' correlation for spherical particles. From the present analysis, the distributions of velocity and temperature of the coating particles flying inside and outside the HVOF gun are predicted.

关键词： supersonic nozzle supersonic jet thermal spraying gas-particle flow.

Homogeneity tests on neutron shield concrete

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Nuclear Science and Techniques 2014年第A1期25卷 57-61页

作者： Koichi Okuno hiroshi Iikura HAZAMA ANDO Technical Research Institute 515-1 Karima Tsukuba Ibaraki 305-0822 Japan JAEA Quantum Beam Science Directorate 2-4 Shirakata Tokai-mura Naka-gun Ibaraki 319-1195 Japan

In recent years, neutrons have been studied for application in fields such as material analysis and boron neutron capture therapy. To create a compact shield for these facilities, a neutron shield concrete is developed. Verifying the homogeneity of the concrete is important to ensure adequate shielding performance. In this research, neutron radiography images of the concrete are taken using the Thermal Neutron Radiography Facility (TNRF) of the JRR-3 research reactor, and the transmission ratio of the thermal neutrons were estimated. The results showed that the transmission ratio of the concrete was almost the same at each depth. © 2014, Science Press. All rights reserved.

关键词：中子屏蔽同质性测试研究反应堆中子俘获屏蔽性能照相设备中子照相

Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury

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Neural Regeneration Research 2018年第6期13卷 981-982页

作者： hiroshi Nakagawa Masahiko Takada Sobell Department of Motor Neuroscience and Movement Disorders Institute of Neurology University College London Systems Neuroscience Section Primate Research Institute Kyoto University

Spinal cord injury（SCI）leads to permanent disability with motor and sensory *** mature mammalian central nervous system（CNS）possesses a limited capacity to regenerate/regrow after injury.

关键词： Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury SCI

Conditions Where the Ruled Class Unites for the Revolution:Applicability of a Game Theory on Social Dilemmas

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学术界 2019年第6期 185-192页

作者： hiroshi Onishi Keio University

Revolutions,typical cases of crucial social transformations,cannot be realized successfully without a large number of ***,creating conditions favorable for acquiring enough participants should be an important topic of Marxist social *** particular,this problem includes the “free-ride,” because the benefits of revolutionaries’ activities are gained not only by the activists but also by all other *** paper analyzes problems such as this one,applying non-cooperative game theory to social dilemma *** leads to some interesting *** this research,the problem of the workers’ choice between unity or freeride is first defined using numerical examples of the gain *** is defined again in a more generalized form using other *** so doing,we express both the cost of participating in the movement and the gains from the concession of the ruling *** this analysis focuses on the importance of the number of participants,the concession of the ruling class is framed as a function of the number of *** results of this analysis revealed that the economic base and superstructure accurately correspond in some game structures but not in *** other words,the social dilemma presents either as a case of prisoners’ dilemma or as a chicken ***,this paper analyzes the influence of group size,and it was revealed that groups with a large number of members,such as a ruled class,find it particularly difficult to *** phenomenon is called the “large group dilemma.” In these ways,this research shows that the aforementioned type of game theory can be used to analyze the difficulties and possibilities of social movements.

关键词： revolution historical materialism social dilemma large group chicken game

Fixed-ratio combinations of basal insulin and glucagon-like peptide-1 receptor agonists as a promising strategy for treating diabetes

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World Journal of Diabetes 2023年第3期14卷 188-197页

作者： hiroshi Nomoto Department of Rheumatology Endocrinology and NephrologyFaculty of Medicine and Graduate School of MedicineHokkaido UniversitySapporo 060-8638HokkaidoJapan

The maintenance of appropriate glycemic control is important for the prevention of diabetic complications in people with type 2 diabetes(T2D). Numerous oral antidiabetic drugs are now clinically available, but in particular, the introduction of injection regimens using insulin and/or glucagon-like peptide-1 receptor agonist(GLP-1RA)s represents promising step-up options for oral antidiabetic drug treatment. The recently licensed fixed-ratio combination(FRC) products,which comprise basal insulin and a GLP-1RA, have potent anti-hyperglycemic effects and reduce the undesirable side-effects of each component, such as body weight gain, hypoglycemia, and gastrointestinal symptoms. Two FRCs-insulin degludec/Liraglutide and insulin glargine/Lixisenatide-are now clinically available and, to date, several phase Ⅱ/Ⅲ trials have been conducted in particular groups of subjects with T2D. However, their utility in real-world clinical settings is of interest for most clinicians. Recently reported real-world clinical trials of these two FRCs in various situations have demonstrated their efficacy regarding glycemic control and the quality of life of people with T2D. Their long-term safety and efficacy require confirmation, but a treatment strategy that includes an FRC may be compatible with the concept of “well-balanced” therapy in certain groups of patients with T2D who have inadequate glycemic control.

关键词： Clinical trial Diabetes mellitus,type 2 Glucagon-like peptide-1 receptor Glycemic control Insulin,long-acting Quality of life