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Miniaturization of Bubbles by Shock Waves in Gas-Liquid Two-phase Flow in the Venturi Tube

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Journal of Thermal Science 2021年第3期30卷 1068-1076页

作者： JIANG Xin yasunobu Tsuyoshi NAKAMURA Arisa SHIMAZU Masaki National Institute of Technology Kitakyushu College KitakyushuFukuoka 802-0985Japan

Fine bubbles have been widely applied in many fields such as industry,medical engineering and ***,many attentions have been paid to the study of fine bubble generations in order to increase the yield while decrease the ***,the generation process of fine bubbles is a quite complicated process in which multiple hydrodynamic forces are interacted in the gas-liquid two-phase *** studies focus on the techniques of the converging-diverging nozzle(venturi tube)generator,which is famous for its simple and cheap features,and generates fine bubbles by using the miniaturization phenomenon of bubbles occurring in the venturi ***,the impact conditions on the amount and size of bubbles such as nozzle geometry and bleed air haven’t been investigated *** this work,we implement many experiments on the venturi tube fine bubble generators with different geometries and generating conditions,and evaluate different factors impacting the production components such as the volume and the bubble *** experimental results show that the supersonic flow filed in the venturi tube promotes the miniaturization of the bubbles,and the convergent angle of the nozzle and air bleed have a great impact on the size and volume of bubbles.

关键词： fine bubble shock wave gas-liquid two-phase flow venturi tube

Characteristic and Mechanism of Pressure Fluctuation Caused by Self-Induced Oscillation of Supersonic Impinging Jet

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Journal of Thermal Science 2013年第2期22卷 123-127页

作者： Tsuyoshi yasunobu Yumiko Otobe Hideo Kashimura Department of Control & Information Systems Engineering Kitakyushu College of Technology

When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow oscillation occurs. This oscillation depends on the pressure ratio in the flowfield, the position of an obstacle and is related with the noise problems of aeronautical and other industrial engineering. The characteristic and the mechanism of self-induced flow oscillation, have to be clarified to control various noise problems. But, it seems that the characteristics of the oscillated flowfield and the mechanism of an oscillation have to be more cleared to control the oscillation. This paper aims to clarify the effect of the pressure ratio and the obstacle position and the mechanism of self-induced flow oscillation by numerical analysis and experiment, when the underexpanded supersonic jet impinges on the cylindrical body. From the result of this study, it is clear that occurrence of the self-induced flow oscillation depends on the pressure balance in the flowfield.

关键词：超音速冲击射流自激振荡机制压力脉动特性振荡流场噪音问题超音速射流

Effect of Plate Position and Size for Self-Induced Flow Oscillation of Underexpanded Supersonic Jet Impinging on Perpendicular Plate

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Journal of Thermal Science 2011年第3期20卷 238-241页

作者： Tsuyoshi yasunobu Yumiko Otobe Hideo Kashimura Department of Control & Information Systems Engineering Kitakyushu College of Technology Sii Kokuraminami-ku Kitakyushu-shiFukuoka 802-0985 Japan

When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow oscillation occurs at the specific condition of the pressure ratio in the flowfield, the position of an obstacle and so on. This oscillation is related with the noise problems of aeronautical and other industrial engineering so that the characteristic and the mechanism of self-induced flow oscillation have to be cleared to control the various noise problems. But, it seems that the characteristics of the oscillated flowfield and the mechanism of oscillation have to be more clear to control the oscillation. This paper aims to clarify the effect of the plate position and the width for the self-induced flow oscillation of an underexpanded supersonic jet impinging on the perpendicular plate by the experiment and the numerical analysis. From the results, it is clear that the occurring domain of the self-induced flow oscillation and its dimension strongly depend on the plate position and the width.

关键词：超音速射流振荡流场自诱导位置尺寸垂直板撞击

Numerical Study for Hysteresis Phenomena of Shock Wave Reflection in Overexpanded Axisymmetric Supersonic Jet

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Journal of Thermal Science 2006年第3期15卷 220-225页

作者： Tsuyoshi yasunobu Ken Matsuoka Hideo Kashimura ShigeruMatsuo ToshiakiSetoguchi Corresponding Author Department of Control and Information Systems EngineeringKitakyushuCollege of Technology5-20-1 ShiiKokuraminamiKitakyushuJapan Kitakyushu College of Technology 5-20-1 ShiiKokuraminamiKitakyushuJapan(Student) Kitakyushu College of Technology 5-20-1 ShiiKokuraminamiKitakyushuJapan Department of Mechanical Engineering Saga University1HonjoSagaJapan

当高压的气体对从超声的嘴的真空房间精疲力尽时， overexpanded 超声的喷气以特定的状况被形成。在二维的超声的喷气，而且，为流动地里的冲击波的思考类型的磁滞现象现象在伪稳定的流动下面并且例如被发生，这被知道，在常规思考( RR ... 详细信息

当高压的气体对从超声的嘴的真空房间精疲力尽时， overexpanded 超声的喷气以特定的状况被形成。在二维的超声的喷气，而且，为流动地里的冲击波的思考类型的磁滞现象现象在伪稳定的流动下面并且例如被发生，这被知道，在常规思考( RR )和马赫思考(先生)之间的过渡压力比率被这现象影响。许多报纸为 underexpanded 描述了磁滞现象现象在 overexpanded axisymmetric 喷气下面的超声的喷气，而是这现象没在过去的报纸被详细说明。这研究的目的是用 TVD 方法在 overexpanded axisymmetric 喷气为冲击波的思考类型清除磁滞现象现象并且讨论磁滞现象现象的特征。

关键词：可压缩流轴对称流超声射流规则反射

Performance and Internal Flow of Sirocco Fan Using Contra-Rotating Rotors

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Journal of Thermal Science 2008年第1期17卷 35-41页

作者： J.Fukutomi T.Shigemitsu T.yasunobu Institute of Science and Technology The University of Tokushima2-1 Minamijyosanjima-choTokushima 770-8506JAPAN Institute of Science and Technology The University of Tokushima2-1 Minamijyosanjima-choTokushima 770-8506JAPAN Research Associate Graduate School of Advanced Technology and Science The University of Tokushima2-1 Minamijyosanjima-choTokushima 770-8506JAPAN

用一个内部转子是的 contra-rotating 在转子的一把西洛可风扇子在内安定西洛可风扇子转子和各个转子在一个相反的方向旋转为得到更高的压力并且做一把西洛可风扇子的结构的目的被建议更紧缩。如果高分泌物压力随 contra-rotating 转子... 详细信息

用一个内部转子是的 contra-rotating 在转子的一把西洛可风扇子在内安定西洛可风扇子转子和各个转子在一个相反的方向旋转为得到更高的压力并且做一把西洛可风扇子的结构的目的被建议更紧缩。如果高分泌物压力随 contra-rotating 转子的采纳被获得，它能被用于各种各样的目的。有 contra-rotating 转子的一把西洛可风扇子的压力系数比一把常规西洛可风扇子 2.5 倍高于常规西洛可风扇子和到更大的流动率的 contra-rotating 转子移动的最大的效率点。在另一方面，它从流动测量结果被澄清在 contra-rotating 转子的外部转子的插头的那个周围速度部件变得比常规的大。在现在的纸，有 contra-rotating 转子的一把常规西洛可风扇子和一把西洛可风扇子的表演被显示出，在两个盒子的外部转子的插头的内部流动地被澄清。然后，表演和内部流动地上的 contra-rotating 转子的不同类型的效果被调查，有高效的转子设计将被讨论。

关键词：热能排风机高压力旋转式喷灌器低角度环形弧度浆叶

Feasibility study of laser-driven neutron sources for pharmaceutical applications

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High Power Laser Science and Engineering 2023年第2期11卷 37-43页

作者： Takato Mori Akifumi Yogo yasunobu Arikawa Takehito Hayakawa Seyed R.Mirfayzi Zechen Lan Tianyun Wei Yuki Abe Mitsuo Nakai Kunioki Mima Hiroaki Nishimura Shinsuke Fujioka Ryosuke Kodama Institute of Laser Engineering Osaka UniversitySuitaJapan National Institutes for Quantum Science and Technology TokaiJapan Tokamak Energy Ltd. AbingdonUK Graduate School of Engineering Osaka UniversitySuitaJapan Fukui University of Technology FukuiJapan

We predict the production yield of a medical radioisotope^(67)Cu using^(67)Zn(n,p)^(67)Cu and ^(68)Zn(n,pn)^(67)Cu reactions with fast neutrons provided from laser-driven neutron *** neutrons were generated by the p+9Be and d+9Be reactions with high-energy ions accelerated by laser–plasma *** evaluated the yield to be(3.3±0.5)×10^(5) atoms for^(67)Cu,corresponding to a radioactivity of 1.0±0.2 Bq,for a Zn foil sample with a single laser *** a simulation with this result,we estimated^(67)Cu production with a high-frequency *** result suggests that it is possible to generate^(67)Cu with a radioactivity of 270 MBq using a future laser system with a frequency of 10 Hz and 10,000-s radiation in a hospital.

关键词： laser ion acceleration laser-driven neutron source medical radioisotope

Early colon cancer within a diverticulum treated by magnifying chromoendoscopy and laparoscopy

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World Journal of Gastroenterology 2010年第12期16卷 1545-1547页

作者： Kuang I Fu Yukihiro Hamahata yasunobu Tsujinaka Department of Coloproctology Tokatsu-Tsujinaka Hospital Department of Gastroenterology Juntendo University Nerima Hospital

We report a unique case of intramucosal carcinoma in a tubulovillous adenoma arising from a single *** mucosal resection(EMR)was carried out successfully and completely with the assistance of laparoscopy.A 71-year-old man was admitted to our hospital because of melena and *** colonoscopy showed diverticulosis in the right-sided ***,endoscopy could not exactly detect the bleeding site.A flat elevated polyp was found within a single diverticulum located in the descending colon and diagnosed as an intramucosal carcinoma,as magnifying chromoendoscopy revealed a type Ⅳ pit *** his diverticular bleeding repeated,a rightsided hemicolectomy was decided for treatment,the polyp within the diverticulum was also completely removed by EMR with the assistance of *** a colonic perforation was detected immediately after EMR,the perforation was closed with endoclips intraluminally and also repaired laparoscopically from the serosal ***,the resected lesion was an intramucosal well-differentiated adenocarcinoma and the surgical margin was free of tumor.

关键词： Early colon cancer Diverticulum Magnifying chromoendoscopy Endoscopic mucosal resection Laparoscopy

Characteristics of Spherical Shock Wave and Circular Pulse Jet Generated by Discharge of Propagating Shock Wave at Open End of Tube

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Journal of Thermal Science 2003年第3期12卷 245-249页

作者： Tsukasa Irie Tsuyoshi yasunobu Hideo Kashimura Toshiaki Setoguchi Kazuyasu Matsuo Department of Mechanical Engineering Kitakyushu National College of Technology ShiiKokuraminami-ku Kitakyushu 802-0985 JapanDepartment of Control and Information Systems Engineering Kitakyushu National College of Technology Shii Kokuraminami-ku Kitakyushu 802-0985 JapanDepartment of Control and Information Systems Engineering Kitakyushu National College of Technology Shii Kokuraminami-ku Kitakyushu 802-0985 JapanDepartment of Mechanical Engineering Saga University Honjo Saga 840-8502 JapanDepartment of Mechanical Systems and Environmental Engineering Univ. of Kitakyushu1-1 Hibikino Wakamatsu-ku Kitakyushu808-0135 Japan

When the shock wave propagating in the straight circular tube reaches at the open end, the impulsive wave is generated by the emission of a shock wave from an open end, and unsteady pulse jet is formed near the open end behind the impulsive wave under the specific condition. The pulse jet transits to spherical shock wave with the increase in the strength of shock wave. The strength is dependent on the Mach number of shock wave, which attenuates by propagation distance from the open end. In this study, the mechanism of generating the unsteady pulse jet, the characteristics of the pressure distribution in the flow field and the emission of shock wave from straight circular tube which has the infinite flange at open end are analyzed numerically by the TVD method. Strength of spherical shock wave, relation of shock wave Mach number,distance decay of spherical shock wave and directional characteristics are clarified.

关键词：冲击波数值分析 TVD方法圆形管道传播过程脉动式喷气发动机流量流体力学

Characteristics of the Mach Disk in the Underexpanded Jet in which the Back Pressure Continuously Changes with Time

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Journal of Thermal Science 2003年第2期12卷 132-137页

作者： T.Irie T.yasunobu H.Kashimura T.Setoguchi Department of Mechanical Engineering Kitakyushu National College of TechnologyShiiKokuraminami-kuKitakyushu 802-0985JapanDepartment of Control and Information Systems EngineeringKitakyushu National College of TechnologyShiiKokuraminami-kuKitakyushu 802-0985JapanDepartment of Control and Information Systems EngineeringKitakyushu National College of TechnologyShiiKokuraminami-kuKitakyushu 802-0985JapanDepartment of Mechanical EngineeringSaga UniversityHonjoSaga 840-8502Japan

When the high-pressure gas is exhausted to the vacuum chamber from the nozzle,the underexpanded supersonic jet contained with the Mach disk is generally *** eventual purpose of this study is to clarify the unsteady phenomenon of the underexpanded free jet when the back pressure continuously changes with *** characteristic of the Mach disk has been clarified in consideration of the diameter and position of it by the numerical analysis in this *** sonic jet of the exit Mach number Me=1 is assumed and the axisymmetric conservational equation is solved by the TVD method in the numerical *** diameter and position of the Mach disk differs with the results of a steady jet and the influence on the continuously changing of the back pressure is evidenced from the comparison with the case of steady supersonic jet.

关键词：不完全膨胀喷流音速喷流规则反射马赫反射马赫圆盘 TVD法冲击波