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

作者： Wang, Jun Corradii, Michael L. Haskin, Troy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Unite State Eagle Height 915 College of Engineering University of Wisconsin-Madison MadisonWI53705 United States

ISBN: (纸本)9781510811843

Recently, MAAP and MELCOR research teams completed a set of accident simulations to reconstruct the Fukushima-Daiichi accident in order to better understand severe accident progression. One result from this work was that the predicted hydrogen generation in MELCOR is notably more than in MAAP. The fuel rod degradation process (i.e., debris formation and blockage models) may likely be responsible for this hydrogen generation difference and an opportunity exists to understand the key reasons for this difference. To examine this hypothesis, the PHEBUS FPT1 experiment is selected as a benchmark test, and MELCOR is used as the analysis tool. In the past, the core degradation process of PHEBUS tests was simulated with MELCOR for fission product release insights. In this work, our calculation results are compared to PHEBUS FPT1 data to verify our MELCOR calculation. Given this validation of a nominal MELCOR simulation of the FPT1 test, we start the second step to use the volume fractions of each component as a way to visualize the debris-blockage geometric arrangement for PHEBUS FPT1 as the fuel degradation event proceeds. These results could also provide a logical approach for improving the fuel degradation (i.e., debris formation and blockage models). Relevant research is still ongoing, and will be provided in the final paper. © Copyright (2015) by American Nuclear Society All rights reserved.

关键词： Debris

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High-temperature oxidation kinetics of iso-octane/nbutanol blends-air mixture 10

High-temperature oxidation kinetics of iso-octane/nbutanol b...

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10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Li, Xiaotian Zhang, Xinyi Hu, Erjiang Huang, Zuohua State Key Laboratory of Multiphase Flows in Power Engineering Xi'an Jiaotong University Xi'an Shanxi Province710049 China

N-butanol/iso-octane blends chemical kinetic mechanism is established on the basis of a nbutanol reaction submodel and part of a high-temperature oxidation mechanism of iso-octane, laminar flame speeds of iso-octane/n-butanol blends are simulated and compared with the experimental data sets. It reveals that the Su increases nonlinearly with the increase of n-butanol in the blend and implies that the intermediates of n-butanol are more reactive. Then detailed kinetic path analysis of both nbutanol and iso-octane was performed to find out the rationale for the accelerating. The most influential intermediate reactions were determined for the blend, and flame propagation is largely negative related to concentration of ic4h8 c3h6 and CH3, while C2H4 and C2H3 contribute to the promotion of laminar flame speeds. Flame structures of n-butanol blending iso-octane were also computed and correspond to the kinetic path analysis.

关键词： Blending

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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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An improved moving particle semi-implicit method for simulating viscous free surface flows without compressible stress instability

An improved moving particle semi-implicit method for simulat...

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7th International Conference on Fluid Mechanics(ICFM7)

作者： Hao Xiang Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

＜正＞Moving Particle Semi-implicit（MPS）method and Smoothed Particle Hydrodynamics（SPH）have been widely applied in modelling free surface ***,application of the meshfree methods was still limited due to the problem of compressible stress instability,which occurs in the presence of attractive forces when particles are approaching and the low accuracy of the numerical schemes for gradient operator.

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Synthesis of tert -amyl Ethyl Ether for Gasoline Additive

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Energy Procedia 2015年 75卷 3265-3270页

作者： Zhao Lei Hang Zhang Jing-Jun Liu Bo-Lun Yang Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A series of experiments were carried out in a batch reactor at the temperature range of 313-343 K to study the synthesis of tert -amyl ethyl ether from ethanol (EtOH) and 2-methyl-1-butene (2M1B) catalyzed by the NKC-9 ion-exchange resin. The suitable reaction pressure was obtained by using the method of the Gibbs free energy minimization. The activity coefficients of each component were accurately calculated using the Wilson method, then, the equilibrium constants was obtained. The effect of catalyst size, stirring rate, temperature and EtOH/2M1B molar ratio was investigated at the chosen pressure, respectively. A kinetic model which considered the variation of each component volume was established. The method of nonlinear least square combined with genetic algorithm (NLS-GA) was proposed to estimate the kinetic constant in the forward direction. Results indicated that simulated kinetics results were agreed well with the experimental data.

关键词： Batch reaction Gibbs free energy Kinetics Aspen Plus

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Layer assignment and arrangement optimization for multi-stream plate-fin heat exchanger design 24

Layer assignment and arrangement optimization for multi-stre...

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24th IIR International Congress of Refrigeration, ICR 2015

作者： Wang, Zhe Li, Yanzhong Institute of Refrigeration and Cryogenics Xi'an Jiaotong University No.28 Xianning West Road Xi'an Shaanxi710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9782362150128

The design of layer assignment and arrangement still remains an obstacle for optimizing the performance of the multi-stream plate-fin heat exchangers. A novel layer assignment and arrangement modelling and optimization method are proposed in this paper. It is a combination method of the equipartition of entropy production and the balance of local heat load, by means of which the pressure drop rise and heat transfer performance drop caused by inappropriate layer assignment and arrangement could be reduced to a large extent. The specific entropy generation rates of heat transfer and fluid friction are adopted as the dual objective functions and simultaneously minimized. This model exhibits a good robustness and high efficiency when used to design main heat exchanger in air separation plants, and simultaneity optimizes the plate fin configurations and layer arrangement.

关键词： Entropy

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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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