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Vortex-In-Cell Simulation of Free Falling Particulate Jet

Procedia engineering 2015年 102卷 1612-1620页

作者： Rui Wang Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A two-way coupling three-dimensional Vortex-In-Cell (VIC) method is developed for the simulation of gas-solid turbulent flow. The evolution of vortex elements and the motion of solid particles are tracked in the Lagrangian frame, while the flow field is solved by the vorticity Poisson equation on the Eulerian grid. Two-way coupling is implemented by introducing a vorticity source term induced by the motion of particle. This method is applied to simulate the particulate jet generated by solid particles falling from a circular orifice into unbounded quiescent air. The simulation results agree well with the experiment conducted by Ogata, which confirmed the validation of this method. The simulation results demonstrate that the air velocity radial distribution due to the particulate jet satisfies Gaussian distribution. The particle flow rate has little influence on the spread of particles, while velocity of particles increases with increasing the particle flow rate.

关键词： Votex-In-Cell method Particles Two-way coupling

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Experiment of condensation in T-junction: Steam-water flow in water-injected condition 16

Experiment of condensation in T-junction: Steam-water flow i...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Ren, W.Y. Yu, G.J. Bian, J.W. Tian, W.X. Su, G.H. Qiu, S.Z. Fu, X.L. School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University No. 28 Xianning West Road Xi'an710049 China State Nuclear Power Software Development Center Beijing102206 China National Key Laboratory of Nuclear Power Software Beijing10226 China

ISBN: (纸本)9781510811843

Condensation of two-phase flow inside a tube within sub-cooled coolant injected show a complicated phenomenon which affects both the pressure drops from the upstream to downstream and the void fraction distribution in tube. This phenomenon always appears in the T-junction which kind of structure could be found in nuclear power plants design. The investigation about injection to two-phase flow in this structure can help us predict the hydrodynamic phenomenon of condensation heat transfer. Distribution of the fluid temperature and heat transfer coefficient (HTC) due to fluid-fluid mixing and steam condensation had been considered to be a significant process which is included in the pressurized thermal shock (PTS) research. Previous researches had built the integral effect test to analysis the effect of thermal mixing. However, the practical condensate process in T-junction injected is too hard to be predict accurately, which is contributed to the structure, the geometric dimension, the mass flow rate between the main and branch pipe, the flow patterns, the void fraction of two-phase flow, temperature of flow, pressure, etc. We analyzed the process of cooling water injecting from the branch pipe into a horizontal main pipe, and also focus on the phenomena of water injection in steam or different flow patterns. We had set some thermo couples inserting to the tube to keep observing the temperature field inside. The initial conditions of the experiment about the flow pattern before the injection includes stratified flow, wavy flow, annular flow and dispersed flow. We also took the heat dissipation between the test facility and surround into consideration. The experiment is a separate effect test program which based on the phenomena about condensation in T-junction with 45° incidence injection and progressed on ordinary pressure.

关键词： Two phase flow

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Corrigendum to “A 1D model to predict ejector performance at critical and sub-critical operational regimes” [JIJR 36/6 (2013) 1750–1761]

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International Journal of Refrigeration 2017年 75卷 177-177页

作者： Weixiong Chen Ming Liu Daotong Chong Junjie Yan Adrienne Blair Little Yann Bartosiewicz State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Université Catholique de Louvain (UCL) Institute of Mechanics Materials and Civil Engineering (iMMC) Place du Levant 2 B-1348 Louvain-la-Neuve Belgium George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332-0405 USA

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Core degradation research and the simulation of PHEBUS FPT-1

Core degradation research and the simulation of PHEBUS FPT-1

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2015 ANS Annual Meeting

作者： Wang, Jun Corradini, Michael L. Haskin, Troy Department of Engineering Physics University of Wisconsin-Madison 1500 Engineering Drive MadisonWI53706 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

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Development of a thermal-mechanical-material behavior analysis code for the dispersion-plate-type fuel 16

Development of a thermal-mechanical-material behavior analys...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Wu, Yingwei Lu, Qing Deng, Yangbin Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China Department of Nuclear Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781510811843

In this study, the relevant thermal-hydraulic, mechanic-material and burnup effect calculation models were established. On the basis of these mathematic and physic models, a thermal- mechanic-material coupling analysis code for a dispersion-plate-type fuel assembly was independently developed with the consideration of the burnup effects. The coupling program was applied to perform the thermal-mechanical-material behavior analysis of a dispersion-plate-type fuel assembly. Major physical parameters at different burnup stages were well predicted, including flux distribution, temperature profile, Mises stress and mechanic deformations. The result shows that geometric sizes of flow channels are the key parameters determining the coolant flux distribution and the temperature profile of the edge plate presents substantial asymmetry as a result of asymmetric heat transfer caused by the asymmetric geometry. Furthermore, the equivalent stress of base material increased rapidly with burnup because of the thermal expansion and burnup effects, which resulted in substantial plastic deformation and mechanical damage. In addition, the mechanism and process of blistering was investigated for blistering prediction. The result shows that due to the increasing fission gas pressure and the deteriorating yield stress of the cladding, fuel plate blistering may happen when the burnup depth up to a certain value and fuel plate will finally fall into failure as a result of over plastic deformation.

关键词： Plastic deformation

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Simulations of ECC safety injection for single phase and stratified phase flow 16

Simulations of ECC safety injection for single phase and str...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Wang, Kai Cai, Rong Ren, Wuyue Qiu, Suizheng Tian, Wenxi Su, G.H. Chen, Ronghua School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Xianning West Rd. 28 Xi'an Shaanxi710049 China

ISBN: (纸本)9781510811843

ECC safety injection nozzles are usually placed at the primary circulation pipelines as for the Gen II-plus nuclear reactor. Small Break Loss of Coolant Accident (SBLOCA) may lead to Pressurized Thermal Shock (PTS) on the Reactor Pressure Vessel (RPV) wall. Based on the Emergency Core Cooling (ECC) of a 2nd generation plus PWR, the CFD software CFX was adopted to simulate the thermal mixing phenomenon of the sub-cooled water from safety injection nozzle and high temperature water or steam from the cold leg which later forms into stratified flow. Also the steam-water simulation takes the steam condensation into consideration and steam condensation is characterized by a relatively large interfacial area between the two phases. For simulations of single-phase thermal mixing, the temperature profiles of different points were obtained and agreed well with the experiment. For steam mixing with water, the gas volume profile and the condensation rate of the steam were obtained and compared with the experiment, and the effect of different injection nozzle water velocities were also studied.

关键词： Steam

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Nanoporous Graphene Membrane for Gas Separation:Review and Our Progress

Nanoporous Graphene Membrane for Gas Separation:Review and O...

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2015欧亚经济论坛-2015第五届国际纳米科技大会

作者： Bofeng Bai Chengzhen Sun Boyao Wen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Graphene is a one-atom-thick sheet of graphite comprising sp2-hybridized carbon atoms arranged in the hexagonal honeycomb *** removing the honeycomb lattices and forming nanopores with specific geometry and size,nanoporous graphene has been demonstrated as a very high-efScient separation membrane,due to the ultrafast molecular permeation rate for its one atomic *** this presentation,we review the recent advances in nanoporous graphene membrane for the application of gas separation,including the recent theoretical and experimental works,the gas molecular transport mechanisms through the graphene nanopores and the advanced fabrication methods of this stateof-the-art ***,we give a brief introduction on our relevant *** proposed two mechanisms(direct mechanism *** mechanism) for the gas molecular permeation through nanoporous graphene *** quantified the relative contribution of the two mechanisms and showed that the direct flux can be described reasonably accurately using kinetic theory with an appropriate modification assuming steric molecule-pore *** identified an inhibition effect of non-permeable components on the permeation of permeable component,caused by the relatively weakening adsorption on the graphene surface and the blocking effect of non-permeable *** also reported an asymptotically pressure-dependent gas permeation flux owing to the isothermal adsorption *** addition,we demonstrated the potential of nanoporous graphene membranes in natural gas processing to efficiently separate CO2,H2 S,N2,H2 O and others from CH4 with high permeability and selectivity.

关键词： Graphene Nanoporous Graphene Membrane for Gas Separation:Review and Our Progress

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A three-dimensional numerical analysis of platelet flow in a carotid artery

A three-dimensional numerical analysis of platelet flow in a...

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7th International Conference on Fluid Mechanics(ICFM7)

作者： Guojie Li Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Human carotid artery is bifurcated into two arteries in the neck,supplying blood to the brain and facial *** plaque tends to occur and develop in carotid artery sinus,where stenoses and other lesions can cause cerebral *** is accepted that the chronic exposure of the endothelial cells to lower wall shear stress(WSS)is associated with thickening of the vessel wall and development of atherosclerotic ***,platelet in blood is also accepted to play es-

关键词： profile A three-dimensional numerical analysis of platelet flow in a carotid artery WSS

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An Efficient Compound Parabolic Concentrator for Concentrating Solar Photovoltaic-Thermal Hybrid System

An Efficient Compound Parabolic Concentrator for Concentrati...

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2015欧亚经济论坛-2015第五届国际新能源产业大会

作者： Jinjia Wei State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Solar energy devices/systems are required to have high efficiency at low costs to be competitive with conventional energy *** promising approach is to combine a concentrating photovoltaic cell with a solar thermal collector,referred to as concentrating photovoltaic-thermal hybrid system（PV/T）.The PV/T system provides both electricity and usable heat which can enhance total efficiency of the *** concentrating efficiency,photoelectric and light-thermal conversion efficiency are key factors affecting the performance of concentrating photovoltaic-thermal hybrid *** proposed a new design method of integrated compound parabolic collector（CPC） the uniformity and economy of which become much *** validity of this new design method was verified by testing this prototype of *** to accurate mathematical model,a plate-type PV/T was manufactured by laminating the polycrystaU PV cells connected in series on the flate cooling water channel made of aUuminum *** performance of the system was measured under total solar radiation intensity of 810 W/mwith scattering light proportion of 15%.The results showed a total efficiency of above 62%（50%thermal efficiency plus 12%electrical efficiency）.

关键词： An Efficient Compound Parabolic Concentrator for Concentrating Solar Photovoltaic-Thermal Hybrid System Hybrid

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Simulation of the spread of oil slicks by a multiphase particle method

Simulation of the spread of oil slicks by a multiphase parti...

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7th International Conference on Fluid Mechanics(ICFM7)

作者： Guangtao Duan Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Oil spills on the ocean are usually serious marine disasters with tremendous economic loss and environmental *** the spreading of the leaked oil is of great significance to the quick responses and engineering decision... 详细信息

关键词： Simulation of the spread of oil slicks by a multiphase particle method

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