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Progress in Multiphase Flow Research最新文献

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Development of a Measurement Technique for Liquid-Solid Flows Induced by Dispersion Phase with High Concentration 高浓度分散相诱导液固流动测量技术的发展
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.141
T. Shigematsu, T. Kohno
{"title":"Development of a Measurement Technique for Liquid-Solid Flows Induced by Dispersion Phase with High Concentration","authors":"T. Shigematsu, T. Kohno","doi":"10.3811/PMFR.2.141","DOIUrl":"https://doi.org/10.3811/PMFR.2.141","url":null,"abstract":"An image velocimetry technique for measuring fluid motion of liquid-solid flow with high particle density is developed and presented. The new technique, which obtains velocities and directions by connecting path lines of tracers in sequence images captured by high speed cameras, is classified into a kind of particle tracking velocimetry. Detail of the algorithm of the developed image velocimetry, called path line connecting velocimetry (PLCV), is presented. Some results of measuring liquid-solid flows induced by dispersion phase with high concentration are presented.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127974699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Optimum Design of a New Micro-Bubble Generator and Its Applications to Industries 新型微泡发生器的优化设计及其工业应用
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.25
F. Matsuyama, S. Kanazawa, M. Sadatomi, A. Kawahara, Keiko Kano
{"title":"Optimum Design of a New Micro-Bubble Generator and Its Applications to Industries","authors":"F. Matsuyama, S. Kanazawa, M. Sadatomi, A. Kawahara, Keiko Kano","doi":"10.3811/PMFR.1.25","DOIUrl":"https://doi.org/10.3811/PMFR.1.25","url":null,"abstract":"Micro-bubble technology has been recognized to be a useful tool to purify water in lake or sea under pollution and to promote the growth of marine and agricultural products. In this study, the performance of Sadatomi's micro-bubble generator has been experimentally investigated in order to estimate the pump power required in the use at deep water level. In addition, an analytical model has been proposed to predict hydraulic performance of micro-bubble generator under any water depths and its validity has been confirmed.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125756624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effects of Surface Tension on Flow Characteristics of Two-Phase Annular Flow in Vertical Small Diameter Pipes 表面张力对垂直小直径管内两相环空流动特性的影响
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.189
M. Sadatomi, H. Tsubone, A. Kawahara, H. Shiota
{"title":"Effects of Surface Tension on Flow Characteristics of Two-Phase Annular Flow in Vertical Small Diameter Pipes","authors":"M. Sadatomi, H. Tsubone, A. Kawahara, H. Shiota","doi":"10.3811/PMFR.1.189","DOIUrl":"https://doi.org/10.3811/PMFR.1.189","url":null,"abstract":"The effects of surface tension on flow characteristics of two-phase annular flow in vertical pipes of 16 to 5 mm i.d. have been studied experimentally and analytically. In the adiabatic experiments, three kinds of liquids mainly with different surface tension were used as the test liquids while air as the test gas. The data obtained were instantaneous and mean void fraction, pressure drop and flow regime, etc. at near atmospheric pressure. The effects of surface tension on each flow parameter were studied by comparing the data for the different liquids. In the analysis, the above data were compared with calculations by various correlations in literatures. Regarding the void fraction, the calculations were conducted mainly by the well-known two-phase two-fluid model. The constitutive equations of the interfacial friction force were tested against the data. The results of the above experiments and comparisons are reported in this paper.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121253257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Numerical Analysis of Cavitation Using CIVA 利用CIVA进行空化数值分析
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.155
N. Tanaka, Kousuke Akutsu, Takaya Taguchi
{"title":"Numerical Analysis of Cavitation Using CIVA","authors":"N. Tanaka, Kousuke Akutsu, Takaya Taguchi","doi":"10.3811/PMFR.1.155","DOIUrl":"https://doi.org/10.3811/PMFR.1.155","url":null,"abstract":"We have developed a numerical method to evaluate behaviors of the cavitating bubbles based on the recent CFD (computational fluid dynamics) techniques. The method employs a finite-volume method combined with the high order and flexible interpolation scheme, CIVA. Two kinds of fluid behaviors, liquid (incompressible) and gas (compressible), are simultaneously computed by the unified scheme, CUP, which can handle the large density ratio (especially in case of mercury) associated with cavitation. By combining it with a new numerical cavitation model, which takes into account of compressibility of gas, good numerical results of water and mercury can be obtained._","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121865397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Bouncing and Coalescence of a Pair of Bubbles Rising Side by Side 一对并排上升的气泡的弹跳和合并
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.1
T. Sanada, K. Sugihara, Minori Shirota, Masao Watanabe, T. Fukano
{"title":"Bouncing and Coalescence of a Pair of Bubbles Rising Side by Side","authors":"T. Sanada, K. Sugihara, Minori Shirota, Masao Watanabe, T. Fukano","doi":"10.3811/PMFR.1.1","DOIUrl":"https://doi.org/10.3811/PMFR.1.1","url":null,"abstract":"Experimental study on bouncing and coalescence of a pair of bubbles rising side by side in a quiescent liquid has been performed. A novel bubble generator has been developed to generate pairs of bubbles precisely. High-speed imaging technique has been employed to investigate the trajectory and shape of bubbles in detail. We observed that the trajectory of rising bubble varies with Reynolds number. When the Reynolds number is over the critical region, a pair of bubbles approaches each other and then collides. After the collision, two types of motion are observed: coalescence and bouncing. We investigate the critical Reynolds number and Weber number, based on the rising velocity, over which bubbles bounce. As a result, we clarify that the critical Weber number is around 2 regardless of Morton number. The critical Reynolds number decreases with increasing Morton number. In addition, we have found that the bouncing of a pair of bubbles differs from that of single bubbles at a wall; the two bubbles perform attracting and bouncing motion continuously with a rising velocity being kept almost constant, and the amplitude of bouncing motion of bubbles is seven to eight times larger than that of a single bubble at a wall.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122940395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Technology Development of Estimation Method for Complex Gas-liquid Two-phase Flow in Nuclear Reactors:(Development of Void Fraction Measurement Techniques, Numerical Simulation, and Nonlinear Statistics Analysis for Unsteady, Inhomogeneous Gas-Liquid Two-Phase Flow) 核反应堆复杂气液两相流估计方法的技术发展(非定常、非均匀气液两相流的空隙率测量技术、数值模拟与非线性统计分析)
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.213
M. Misawa, Akio Suzuki, A. Minato
{"title":"Technology Development of Estimation Method for Complex Gas-liquid Two-phase Flow in Nuclear Reactors:(Development of Void Fraction Measurement Techniques, Numerical Simulation, and Nonlinear Statistics Analysis for Unsteady, Inhomogeneous Gas-Liquid Two-Phase Flow)","authors":"M. Misawa, Akio Suzuki, A. Minato","doi":"10.3811/PMFR.1.213","DOIUrl":"https://doi.org/10.3811/PMFR.1.213","url":null,"abstract":"Numerical simulation of gas-liquid two-phase flow is important for design of nuclear power systems. Conventional codes require experiments from laboratory scale to mock-up to obtain database for constitutive equations and verification. The aim of this study is to provide new simulation technique to substitute for a part of costly experiments. The extended two-fluid model developed by Hitachi, Ltd. was employed to treat inhomogeneous and intermittent two-phase flow behavior, which had been considered through constitutive equations. Validity of the new simulation code for complex two-phase flow was proved by comparison between calculated and experimental void fraction signals from two-phase flows in circular tubes, CCFL of a thick plate, and natural circulation of aerated pool in double cylinders. For measurement of instantaneous, multi-dimensional void fraction distributions, wire-mesh sensor techniques were employed for all test setups. It was found that the two-phase flow has higher orders of dynamics than initially expected, leading to development of robust analysis methods. The comparison was successful for well-structured flow patterns as slug flow, since the large diameter bubbles show low dimensional dynamics. It is also noted that an optimal delay time reconstruction method and a point correlation dimension method together were useful to increase the reliability of the analysis.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130002936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Instantaneous Behavior of Cavitation Clouds at Impingement of Cavitating Water-Jet 空化云在空化水射流冲击下的瞬时行为
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.47
Y. Saito, Keiichi Sato
{"title":"Instantaneous Behavior of Cavitation Clouds at Impingement of Cavitating Water-Jet","authors":"Y. Saito, Keiichi Sato","doi":"10.3811/PMFR.2.47","DOIUrl":"https://doi.org/10.3811/PMFR.2.47","url":null,"abstract":"It is known that water-jet with cavitation clouds shows unsteady behavior and causes high impact. It is useful for not only the water jet technology but also various engineering fields. The unsteadiness of cavitation clouds is one of the most interesting problems for the use of the cavitating water-jet. In this study, we tried to estimate the behavior of the cavitation clouds at the impingement. Especially, the behavior of the cavitation clouds was observed using a high-speed video camera triggered by the cavitation impact, and analyzed with an image processing technique.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123871731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Flow and Aeration Characteristics of Micro Bubble Jet Flow 微气泡射流的流动与曝气特性
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.33
T. Shakouchi, Tadashi Matsumoto, M. Nishio, K. Tsujimoto, T. Ando
{"title":"Flow and Aeration Characteristics of Micro Bubble Jet Flow","authors":"T. Shakouchi, Tadashi Matsumoto, M. Nishio, K. Tsujimoto, T. Ando","doi":"10.3811/PMFR.2.33","DOIUrl":"https://doi.org/10.3811/PMFR.2.33","url":null,"abstract":"In this study, a new micro bubble generator, i.e. nozzle, with a very simple construction is proposed newly and the behavior, such as velocity distribution and spread, of micro bubble jet flow is made clear by PIV and LDA measurements of velocity distribution. The new nozzle uses a very high velocity water jet flow having a large velocity gradient near the nozzle exit. The shearing force shears the gas bubbles and makes considerable small bubbles or rather micro bubbles. The aeration characteristics of this micro bubble generator, i.e. nozzle, are also discussed.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124581464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Bubble Dissolution of CO2-Water Two Phase Bubbly Flows in a Vertical Pipe 垂直管道中co2 -水两相气泡流的气泡溶解
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.9
S. Abe, S. Nozawa, S. Hosokawa, A. Tomiyama
{"title":"Bubble Dissolution of CO2-Water Two Phase Bubbly Flows in a Vertical Pipe","authors":"S. Abe, S. Nozawa, S. Hosokawa, A. Tomiyama","doi":"10.3811/PMFR.2.9","DOIUrl":"https://doi.org/10.3811/PMFR.2.9","url":null,"abstract":"Spatial evolution of radial void and bubble size distributions in CO2-water gas-liquid bubbly flows in a vertical pipe were measured using a conductivity probe and an image processing method. Numerical simulations were carried out using a three-dimensional one-way bubble tracking method with a mass transfer model, which takes into account the accumulation of surfactants on bubble surface and the absorption and desorption of gas components. As a result, the following conclusions were obtained: (1) the decreasing rate of the total gas volume decreases in the flow direction due to the desorption of N2 and O2, the accumulation of surfactants and the bubble volume expansion due to the decrease in static pressure, and (2) the bubble tracking method gave good predictions for the bubble dissolution process in CO2-water bubbly pipe flows.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114422164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Flow Pattern and Pressure Drop Characteristics on Gas/Liquid Two-phase Flow in a Serpentine Capillary Tube 蛇形毛细管内气液两相流的流型和压降特性
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.25
Toru Sukawa, T. Hasegawa, Kenji Yoshida, I. Kataoka
{"title":"Flow Pattern and Pressure Drop Characteristics on Gas/Liquid Two-phase Flow in a Serpentine Capillary Tube","authors":"Toru Sukawa, T. Hasegawa, Kenji Yoshida, I. Kataoka","doi":"10.3811/PMFR.2.25","DOIUrl":"https://doi.org/10.3811/PMFR.2.25","url":null,"abstract":"In the present investigation, detailed observations on the flow patterns and measurements for pressure drop characteristics affected by the curvature effect in a micro-channel were carried out. The test channel has a square cross section that has 2.0 mm on a side, and the radii of the curvature were 1.0 mm and 3.0 mm. It was cleared that the pressure fluctuation intensity became larger in the case of the curvature 1.0mm compared with the case of the curvature 3.0 mm. Furthermore, in order to investigate the influence of the wall wettability, we applied the water repellent micro-channel. In the case of the water repellent micro-channel, the flow pattern tended to easily transit to Annular flow side compared with the normal micro-channel without the water repellent, and we can see a new flow regime like Rivulet flow due to applying water repellent. In addition, the time-averaged pressure drop was decreased in the case of water repellent compared with the case of normal wall. The reason of this is considered that the liquid slug could move easily due to the lower surface tension force at the solid-liquid interface.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115109318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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