Search Results 1-20 of 2620

  • Repetitive Energy Deposition at a Supersonic Intake in Subcritical and Buzz Modes

    Myokan Manabu , Kubota Akiya , Iwakawa Akira , Sasoh Akihiro

    Published Online:26 Oct 2019

    AIAA Journal 58(1), 107-117, 2020-01

    IR 

  • Performance Improvement of Swirl Type Micro Bubble Generator:(2<sup>nd</sup> Report: Effect of Inlet Diameter of Swirl Chamber on Bubble Diameter by Analysis)  [in Japanese]

    KAWAGUCHI Kiyoshi , KASE Atsushi

    … Swirl-type, pressurizing dissolution, and perforated plate methods have been proposed for micro bubble generation. … The swirl-type method can generate micro bubbles even under low-pressure power in a simple structure. … The enlarged inlet diameter of the swirl chamber can reduce the average bubble diameter. … This study examined the effect of the swirl chamber inlet diameter on the flow around chamber outlet in a swirl-type micro bubble generator by numerical analysis. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW, 2020

    J-STAGE 

  • Production of Oxygen Ultrafine Bubble Water with Spray Injection from a Pressurized Container  [in Japanese]

    YAMAZAKI Kyoka , TERASAKA Koichi , FUJIOKA Satoko

    … <p>A novel ultrafine bubble generation method has been developed in this study. … Water with adjusted dissolved oxygen concentration in a pressure vessel was pressurized with oxygen. … After sufficient shaking, the water in the pressure vessel was sprayed through the nozzle into the receiver. … The discharged water was returned to the pressure vessel again, pressurized and shaken with oxygen. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW, 2020

    J-STAGE 

  • Numerical Study on Impulsive Pressure Fluctuations of Horizontal Air-Water Two Phase Slug Flow under Submerged Outlet Condition  [in Japanese]

    SATO Takahiro , OTA Kazuyuki

    … This study was a numerical investigation using OpenFOAM for pressure fluctuations created by the horizontal air-water two-phase slug flow on submerged outlet condition. … A comparison between the numerical results of three different solvers and experimental data indicated that the numerical result using compressibleInterFoam solver could reproduce the pressure fluctuation with sufficient accuracy.</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW, 2020

    J-STAGE 

  • Numerical Simulation of a Rising Bubble in a Shear-Thinning Fluid under Pressure-Oscillating Field  [in Japanese]

    Ito Shunsaku , Iwata Shuichi , Nagumo Ryo , Mori Hideki

    … <p>When pressure-oscillation is applied to a highly viscous solution containing a bubble, the bubble rising velocity is significantly enhanced compared to its natural bubble rising velocity. …

    Nihon Reoroji Gakkaishi 48(3), 145-151, 2020

    J-STAGE 

  • Performance Improvement of Swirl Type Micro Bubble Generator:(1st. Report: Effect of Inlet Diameter of Swirl Chamber on Bubble Diameter by Experiment)  [in Japanese]

    KAWAGUCHI Kiyoshi , KASE Atsushi

    … Swirl type, pressurizing dissolution, and perforated plate methods have been proposed for micro bubble generation. … The swirl type method can generate micro bubbles even under low-pressure power in a simple structure. … This study examined the effect of the swirl chamber inlet diameter on the bubble diameter in a swirl type micro bubble generator. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(2), 352-361, 2020

    J-STAGE 

  • Optimizing Liquid Transport Velocity of Bioinspired Open-type Micro-blade Arrays

    Kuwada Rikima , Ishii Daisuke

    … Nevertheless, these devices have some issues, such as their susceptibility to bubble entrapment and impurities, and their necessity for high pressure to transport liquid as these devices consist of various closed tubes. …

    Journal of Photopolymer Science and Technology 33(2), 177-184, 2020

    J-STAGE 

  • Study on the flow and heat transport characteristics of concentric-tube two-phase thermosyphon

    HONGO Takuya , MIYACHI Yuki , KIMURA Rei , HORIE Hideki , TAKAMATSU Tomonao , IWAKI Chikako

    … We have proposed a model based on bubble pump theory in order to take into consideration the rise of liquid level of the heating section. … We therefore investigated the cause of this difference by making pressure measurements and flow observations, and found that bubble entrainment in the inner tube of the concentric tube of the adiabatic section greatly influences the pressure distribution. …

    Mechanical Engineering Journal 7(3), 19-00578-19-00578, 2020

    J-STAGE 

  • Measurements of in-vessel and ex-vessel liquid corium surface tension and density in the VITI-MBP test bench within ALISA Euro-Chinese project

    DELACROIX Jules , JOURNEAU Christophe , CHIKHI Nourdine , FOUQUART Pascal , ZHAN Dekui

    … This article describes those tests performed in the VITI facility in in CEA severe accident experimental platform, PLINIUS, by means of the Maximum Bubble Pressure (MBP) method. … The measurement procedure using the Maximum Bubble Pressure method is described. …

    Mechanical Engineering Journal 7(3), 19-00611-19-00611, 2020

    J-STAGE 

  • Effects of Ambient Temperature and Carbon Dioxide on Isolated Droplet Burning Behavior of Oxidatively Degraded Methyl Oleate in Microgravity  [in Japanese]

    Shion ANDO , Yuxiang WU , Shinji NAKAYA , Mitsuhiro TSUE

    … Droplet combustion experiments were conducted at atmospheric pressure in air or CO<sub>2</sub> … At high temperature, after a bubble was formed inside the droplet, it expanded abruptly, resulting in a droplet disruption. … The remained fuel also showed bubble formation and disruption periodically until the end of the droplet lifetime. …

    Journal of the Combustion Society of Japan 62(200), 152-160, 2020

    J-STAGE 

  • Mechanism of Potential Oscillation during Electrolysis of Water in Acidic Solutions

    KUGE Terumasa , NISHIMOTO Takanobu , KUROHAGI Masayuki , MAEDA Kouji , YAE Shinji , MUKOUYAMA Yoshiharu

    … In order to obtain a deeper insight into the mechanism of HER oscillation, this present work studies the effect of high pressure (e.g. 0.7 MPa) on the oscillation and current-potential curves. … It also shows that a solution-stirring effect due to the hydrogen bubble evolution, which causes an enhancement of convection near the electrode surface, plays an essential role in HER oscillation. …

    Electrochemistry 88(3), 157-164, 2020

    J-STAGE 

  • A CFD Study on Refractory Wear in RH Degassing Process

    Wang Qiang , Jia Shuyuan , Qi Fengsheng , Li Guangqiang , Li Yawei , Wang Tao , He Zhu

    … The breakup and coalescence of gas bubble was taken into account, and moreover the bubble diameter changed with static pressure. … The results show that the wear behavior of the lining refractory at the up snorkel wall is the most severe due to the rapidly rising bubble. …

    ISIJ International, 2020

    J-STAGE 

  • Development of Mass Production Technology for Nanofiber Air Filter and iPS Cell Culture Scaffold by Electro Bubble Spinning  [in Japanese]

    Kishimoto Yuki

    … <p>This paper reports on the production of nanofibrous materials from a nozzle-less electrospinning method, named "Electro Bubble Spinning", and their applications as air filters and iPS (induced pluripotent stem) cell culture scaffolds. … Electro bubble spinning enables the mass production of nanofibers by stirring the spinning solution with compressed air, resulting in the improvement of the productivity as compared to the nozzle method. …

    Annals of the High Performance Paper Society, Japan 58(0), 25-30, 2020

    J-STAGE 

  • Non-Newtonian Effects on Gas-Liquid Slug Flow in Micro-channel with T-junction Mixer  [in Japanese]

    ARAKAKI Yoichi , YONEMOTO Yukihiro , KAWAHARA Akimaro

    … <p>The length of liquid slug and gas bubble, gas bubble velocity and pressure drop of gas-liquid two-phase flow in a rectangular channel were measured using a high speed camera and a different pressure transducer. … The measured pressure drop data were compared with unit cell model, which applied to gas bubble pressure drop prediction proposed by Kurimoto et al. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 93-99, 2020

    J-STAGE 

  • Weakly Nonlinear Theory on Two Types of High-Speed and High-Frequency Pressure Waves in Compressible Liquids Containing Many Microbubbles  [in Japanese]

    AKUTSU Ryosuke , YOSHIMOTO Takanori , KANAGAWA Tetsuya , UCHIYAMA Yusuke

    … <p>Two types of weakly nonlinear propagations of plane progressive pressure waves in an initially quiescent compressible liquid uniformly containing many spherical gas bubbles are theoretically investigated. … The main assumptions are as follows: (i) The incident wave frequency is much larger than an eigenfrequency of single bubble oscillations; … These two equations can describe high-speed propagation of pressure waves in compressible bubbly liquids.</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 166-179, 2020

    J-STAGE 

  • Numerical Analysis on Nonlinear Evolution of Pressure Waves in Bubbly LiquidsBased on KdV-Burgers Equation  [in Japanese]

    AYUKAI Takahiro , KANAGAWA Tetsuya

    … <p>Oscillation of gas bubbles in a bubbly liquid induces dissipation and dispersion effectsof waves into a nonlinear evolution of pressure waves. … Long-range propagation of pressure waves with a moderately small amplitude is described by the KdV-Burgers (KdVB) equation. … As a result, the initial bubble radius and the initial void fraction strongly contribute the dissipation and dispersion effects, respectively.</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 158-165, 2020

    J-STAGE 

  • Weakly Nonlinear Theory on Pressure Waves in Bubbly Flows with Nonuniform Distributions of Flow Velocities in Gas and Liquid Phases  [in Japanese]

    MAEDA Taiki , KANAGAWA Tetsuya

    … <p>Weakly nonlinear propagation of plane pressure waves in a flowing water uniformlycontaining many spherical microbubbles is theoretically investigated. … As a result, initial velocity distributions affect an advection effect of waves induced by a relative velocity between gas and liquid phases and a moving bubble.</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 140-147, 2020

    J-STAGE 

  • Development and Influence of Solutal Marangoni Effect due to Interface Deformation  [in Japanese]

    KOBAYASHI Kenji , WATAMURA Tomoaki , SUGIYAMA Kazuyasu

    … <p>The Marangoni effect on the repulsive forces on approaching interfaces, which is likely to suppress bubble coalescence due to the surfactant addition, is numerically studied. … We consider a bubble-wall system and a bubble-bubble one. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 222-230, 2020

    J-STAGE 

  • Generation of UFB Water by Pressure Dissolution and Stirring  [in Japanese]

    TAKAYAMA Atsuyoshi

    … Furthermore, UFB (Ultrafine Bubble) water generates negative ions, and thus, simultaneous interactions with the radical species occur. … In the current study, we attempted to generate a large volume of stable UFB water using pressure dissolution and a stirring mixer. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 188-193, 2020

    J-STAGE 

  • Numerical Analysis of Bubble Behavior and Pressure Rise Phenomena Due to Arc under Insulating Oil in Closed Vessel  [in Japanese]

    Tadokoro Tomo , Kotari Masashi , Ohtaka Toshiya , Iwata Mikimasa , Tanaka Yasuhiro

    … <p>When a fault arc occurs in oil-filled electric power equipment, it generates a flammable pyrolysis bubble. … A dynamic pressure rise with the generation of the bubble, may lead to blowout of the oil and a high-temperature flammable gas. … This paper presents a numerical model for the analysis of bubble behavior and pressure rise due to the arc in a closed vessel containing air and oil. …

    IEEJ Transactions on Fundamentals and Materials 140(4), 230-240, 2020

    J-STAGE 

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