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SIRIUS-F設備を用いたBWR-5炉心の安定性評価 采用SIRIUS-F设备的BWR-5堆芯稳定性评价
Progress in Multiphase Flow Research Pub Date : 2008-06-15 DOI: 10.3811/PMFR.3.111
正裕 古谷, 貴憲 深堀, 伸也 溝上, 淳 横谷
{"title":"SIRIUS-F設備を用いたBWR-5炉心の安定性評価","authors":"正裕 古谷, 貴憲 深堀, 伸也 溝上, 淳 横谷","doi":"10.3811/PMFR.3.111","DOIUrl":"https://doi.org/10.3811/PMFR.3.111","url":null,"abstract":"Channel stability, core-wide stability, and regional stability experiments were conducted for a wide range of operating conditions of a BWR-5 with UOX (uranium dioxide) type 9×9A fuels installed, including maximum power points along the minimum pump speed line and the natural circulation line. The SIRIUS-F facility, used in this study, was designed and constructed for highly accurate simulation of void-reactivity feedback of BWRs. The decay ratios and the resonance frequencies are in good agreement with those from the design analysis code, ODYSY. The SIRIUS-F experimental results demonstrated stability characteristics such as a stabilizing effect of the power, and revealed a sufficiently large stability margin even under hypothetical conditions of power enlargement.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124869509","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
Cooling of Large Area for Flow Boiling in Narrow Channels by Improved Liquid Supply 改进供液对窄通道流动沸腾大面积冷却的影响
Progress in Multiphase Flow Research Pub Date : 2008-06-15 DOI: 10.3811/PMFR.3.75
S. Miura, Y. Inada, Y. Shinmoto, H. Ohta
{"title":"Cooling of Large Area for Flow Boiling in Narrow Channels by Improved Liquid Supply","authors":"S. Miura, Y. Inada, Y. Shinmoto, H. Ohta","doi":"10.3811/PMFR.3.75","DOIUrl":"https://doi.org/10.3811/PMFR.3.75","url":null,"abstract":"Heat generation density from semiconductor devices increases with the rapid development of electronic technology. The cooling system using boiling two-phase phenomena attracts much attention because of its high heat removal potential. Experiments on the increase of CHF for flow boiling in narrow channels by improved liquid supply were conducted for the development of high-performance space cold plates. A large surface of 150mm in heated length and 30mm in width with grooves of an apex angle of 90 deg, 0.5mm in depth and 1mm in pitch was employed. A structure of narrow heated channel between parallel plates with an unheated auxiliary channel was devised and tested by using water for different combinations of gap sizes and volumetric flow rates, where inlet of the main heated channel and the outlet of auxiliary unheated channel were closed in order to prevent the flow instability observed frequently at low flow rate for parallel two channels. The data were compared with those for the two parallel channels. CHF values of 2×106W/m2 were obtained for the improved configuration. For gap sizes of 2mm and 5mm at high volumetric flow rate larger than 3.60l/min, the extension of dry-patches were observed at the upstream location of the main heated channel resulting burnout not at the downstream but at the upstream. The values of pressure drop for gap size of 2mm were higher than that for gap size of 5mm. When the performance of cooling system was evaluated by the pump power ignoring its variation of efficiency with volumetric flow rate, i.e., the power defined as the product of the pressure drop and the total volumetric flow rate, higher values of CHF were obtained for gap size of 5mm as far as the same pump power was concerned.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130283482","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
Thermal-Hydraulic Estimation in Tight-Lattice Rod Bundles for Development of the Innovative Water Reactor for Flexible Fuel Cycle 柔性燃料循环新型水反应堆开发中紧晶格棒束的热水力估算
Progress in Multiphase Flow Research Pub Date : 2008-06-15 DOI: 10.3811/PMFR.3.99
M. Kureta, H. Yoshida, H. Tamai, A. Ohnuki, H. Akimoto
{"title":"Thermal-Hydraulic Estimation in Tight-Lattice Rod Bundles for Development of the Innovative Water Reactor for Flexible Fuel Cycle","authors":"M. Kureta, H. Yoshida, H. Tamai, A. Ohnuki, H. Akimoto","doi":"10.3811/PMFR.3.99","DOIUrl":"https://doi.org/10.3811/PMFR.3.99","url":null,"abstract":"","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124806365","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: 4
Adaptive Mesh Refinement Front-tracking 法による油中沈降水滴の数値シミュレーション Adaptive Mesh Refinement Front-tracking法对油中沉降水滴的数值模拟
Progress in Multiphase Flow Research Pub Date : 2007-03-15 DOI: 10.3811/PMFR.2.165
恭史 山本, 知正 植村
{"title":"Adaptive Mesh Refinement Front-tracking 法による油中沈降水滴の数値シミュレーション","authors":"恭史 山本, 知正 植村","doi":"10.3811/PMFR.2.165","DOIUrl":"https://doi.org/10.3811/PMFR.2.165","url":null,"abstract":"In this paper, numerical simulations of a contaminated water drop sinking in silicone oil were performed by a Front-tracking (FT) method. In order to achieve high spatial resolution near the interface, an Adaptive Mesh Refinement (AMR) method was employed. A finite difference scheme suitable for AMR grid systems, which are independent from vortex structure, was proposed and evaluated. Importance of accuracy of the finite difference scheme for viscous term at interface between different size cells was confirmed. Effect of the calculative thickness of interface in FT simulations was evaluated by comparing the results with and without AMR. It was found that the proposed AMR-FT method taking the contamination effect into account can reproduce the experimentally observed water drop very precisely.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691553","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
二相系格子ボルツマン法を用いた液滴衝突の数値解析(直径比0.5 の場合) 使用双相晶格玻尔兹曼方法对液滴碰撞进行数值分析(直径比为0.5时)
Progress in Multiphase Flow Research Pub Date : 2007-03-15 DOI: 10.3811/PMFR.2.157
文平 榊原, 隆二 稲室
{"title":"二相系格子ボルツマン法を用いた液滴衝突の数値解析(直径比0.5 の場合)","authors":"文平 榊原, 隆二 稲室","doi":"10.3811/PMFR.2.157","DOIUrl":"https://doi.org/10.3811/PMFR.2.157","url":null,"abstract":"The lattice Boltzmann method for two-phase flow is applied to the simulations of binary droplet collisions with the size ratio of 0.5 for various Weber numbers of 30 < We < 83, impact parameters of 0 ≤ B ≤ 0.75 and Reynolds numbers of 3000 < Re < 4900. The density ratio of the liquid to the gas is fixed at 50. The results are classified into the three collision formations such as coalescence, reflexive separation, and stretching separation. The boundaries between the three types of collisions are compared with existing theoretical predictions. The mixing processes are also simulated for various Weber numbers at B=0 to investigate the mixing rate during separating collisions, and the relation between the mixing rate and the Weber number is obtained.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128341210","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
The Effect of Gravitational Orientation on Cryogenic Forced Convective Boiling 重力取向对低温强迫对流沸腾的影响
Progress in Multiphase Flow Research Pub Date : 2007-03-15 DOI: 10.3811/PMFR.2.109
治 河南, Kawanami Osamu, Nishida Teruo, 照男 西田, Honda Itsuro, 逸郎 本田, Kawashima Yousuke, 陽介 川島, Ohta Haruhiko, 治彦 大田
{"title":"The Effect of Gravitational Orientation on Cryogenic Forced Convective Boiling","authors":"治 河南, Kawanami Osamu, Nishida Teruo, 照男 西田, Honda Itsuro, 逸郎 本田, Kawashima Yousuke, 陽介 川島, Ohta Haruhiko, 治彦 大田","doi":"10.3811/PMFR.2.109","DOIUrl":"https://doi.org/10.3811/PMFR.2.109","url":null,"abstract":"We investigated the heat transfer during tube quenching for developing an on-orbit cryogenic fluid management system. This paper describes the experimental results of tube quenching for two flow directions (upflow and downflow) under terrestrial conditions. Liquid nitrogen is used as the test fluid, and it is injected into a transparent heated tube at a mass velocity of 100-300 kg/m2s. The tubes are made of Pyrex glass, and have two kinds of inner diameter (10mm and 13.6mm). The thermal data reveals that the quenching time during which the inner wall temperature became equal to the liquid nitrogen temperature under upflow conditions is less than that under downflow conditions. The flow visualization data reveals that the droplet size and flow derangement under upflow conditions were greater than those under downflow conditions. This flow behavior leads to an increase in the cooling rate of the tube wall under upflow conditions.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129067656","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
A Hybrid Method for Predicting Dispersed Gas-Liquid and Liquid-Liquid Multi-Phase Flows 一种预测分散气液和液液多相流的混合方法
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.163
K. Sakoda, Akira Sou, A. Tomiyama
{"title":"A Hybrid Method for Predicting Dispersed Gas-Liquid and Liquid-Liquid Multi-Phase Flows","authors":"K. Sakoda, Akira Sou, A. Tomiyama","doi":"10.3811/PMFR.1.163","DOIUrl":"https://doi.org/10.3811/PMFR.1.163","url":null,"abstract":"A hybrid CMFD (computational multi-fluid dynamics) method is proposed for the prediction of gas-liquid and/or liquid-liquid dispersed two-phase flows including large-scale interface, poly-dispersed bubbles and drops. The method is the hybrid integration of an interface tracking method (ITM), three kinds of particle tracking methods (PTM) and an averaging method based on a multi-fluid model (MFM). The integration enables us to cover a wide range of d*=d/Δx, where d is the particle diameter and Δx the grid size, and to perform various kinds of multiphase CFD such as standard interface tracking, particle tracking and multi-fluid simulations, and hybrid simulations by making an arbitrary combination of ITM, PTM and MFM. The field equations and numerical solution procedure of the proposed method are described in detail. To demonstrate its potential, a poly-dispersed air-water bubbly flow in a vertical square duct and an air-water bubble plume in an open vessel are computed using the combination of ITM, PTM and MFM.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"39 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":"123534846","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
Effect of Wettability of Porous Glass Membrane to Water Phase on Monodispersed Nanobubble Formation 多孔玻璃膜对水相的润湿性对单分散纳米气泡形成的影响
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.1.33
M. Kukizaki
{"title":"Effect of Wettability of Porous Glass Membrane to Water Phase on Monodispersed Nanobubble Formation","authors":"M. Kukizaki","doi":"10.3811/PMFR.1.33","DOIUrl":"https://doi.org/10.3811/PMFR.1.33","url":null,"abstract":"We recently proposed a new method for generating monodispersed nanobubbles from porous glass membranes with uniform pores, in a system consisting of a gaseous phase and a continuous water phase containing a surfactant. In this study, the effect of the surface wettability of the membrane on monodispersed nanobubble formation, using various surface-modified membranes, was examined. The bubbles were generated by forcing air through a surface-modified membrane with mean pore diameters of 72, 210 and 530 nm into distilled water containing 0.3 wt.% of sodium dodecyl sulfate. The membranes were chemically modified with different silane coupler reagents and their surface wettability was evaluated from the contact angle between the membrane surface and the water phase. The contact angle, θ, could be controlled by the number of carbon atoms of the alkyl group in the reagent and/or the concentration of the reagent. Nanobubbles with a narrow diameter distribution were generated from a membrane with θ 45°. In this case, an increased contact angle brought about an increase in the mean bubble diameter and a decrease in the monodispersity of the bubbles.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"39 2 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":"127048473","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
Study on Lift Force acting on Single Drops in Linear Shear Flows 线性剪切流中单个液滴升力的研究
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.55
K. Ogawa, W. Myint, S. Hosokawa, A. Tomiyama
{"title":"Study on Lift Force acting on Single Drops in Linear Shear Flows","authors":"K. Ogawa, W. Myint, S. Hosokawa, A. Tomiyama","doi":"10.3811/PMFR.2.55","DOIUrl":"https://doi.org/10.3811/PMFR.2.55","url":null,"abstract":"Trajectories of single silicon drops in linear shear flows of glycerol-water solutions were measured to evaluate the transverse lift forces acting on the drops. Experiments were conducted under the conditions of logM = -6.3 and -4.8, 0 ReD ≤ 23 and 3.2 ≤ ω ≤ 6.0 s-1, where M is the Morton number, ReD the drop Reynolds number, and ω the magnitude of the velocity gradient of the linear shear flow. The lift coefficient CL was calculated from the measured drop trajectory. As a result, the following conclusions were obtained: (1) CL of spherical drops steeply decreases to zero with increasing ReD, (2) CL of deformed drops decreases from positive to negative values with increasing ReD, and (3) when the shear rate is large and CL is positive, CL takes a larger value for smaller M.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"2 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":"130242203","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: 5
Behavior of Solid Particles in Liquid under Ultrasound Irradiation 超声照射下固体颗粒在液体中的行为
Progress in Multiphase Flow Research Pub Date : 1900-01-01 DOI: 10.3811/PMFR.2.101
J. Ohta, Hiroyuki Nakano, Minoru Okimura, Hiroaki Uematsu
{"title":"Behavior of Solid Particles in Liquid under Ultrasound Irradiation","authors":"J. Ohta, Hiroyuki Nakano, Minoru Okimura, Hiroaki Uematsu","doi":"10.3811/PMFR.2.101","DOIUrl":"https://doi.org/10.3811/PMFR.2.101","url":null,"abstract":"Utilization of ultrasound is considered as an alternative technique for the separation of particles. The authors studied particle behavior in ultrasonic waves in water with frequencies of 23 kHz or 97 kHz. As a result, the particle aggregation types of bands, clump and points are observed, depending on the frequency, power of ultrasound and particle diameter. It was found that some of the aggregation locations for the clump and the point aggregations are reproducible, respectively.","PeriodicalId":381569,"journal":{"name":"Progress in Multiphase Flow Research","volume":"86 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":"134409618","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
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