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作者： Yang, Ying Guo, Liejin Liu, Hongtan International Research Center for 'Solar-Hydrogen' Renewable and Clean Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University 28 West Xianning Road Xi'an Shaanxi 710049 China Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Institute of Analytical Science Northwest University Xi'an Shaanxi 710069 China Department of Mechanical and Aerospace Engineering University of Miami Coral Gables FL 33124 United States

An empirical corrosion model for SS316L in simulated proton exchange membrane fuel cell (PEMFC) environments is developed based on systematic experimental data on the effects of various factors, such as acidity, fluoride ion concentration, temperature and polarization potential. Correlation parameters under different conditions are provided in tabulated forms and comparisons of the empirical model with experimental results are shown in graphical forms. The results show that the empirical model agrees very well with the experimental data except at the short initial polarization time and the model is applicable up to a polarization potential of 0.7 V. The results also show that polarization potential is the most sensitive parameter among all the parameters studied. Highlights: The factors affecting corrosion behavior of SS316L are studied systematically. An empirical corrosion model for SS316L in PEMFC environments is proposed. The polarization potential is the most sensitive parameter. © 2012 Hydrogen Energy Publications, LLC.

关键词： Stainless steel

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Short-term Microgravity Experiment of Pool Boiling Heat Transfer Utilizing the Drop Tower Beijing

Short-term Microgravity Experiment of Pool Boiling Heat Tran...

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Asina Microgravity Pre-Symposium——9th China-Japan-Korea Workshop on Microgravity Sciences(第九届中日韩微重力科学学术会议暨亚洲微重力科学大会)

作者： Jing Li Wang-Fang Du Yan-Fang Xue Jin-Jia Wei Jian-Fu Zhao Key Laboratory of Microgravity Institute of MechanicsChinese Academy of Sciences.Beijing100190China State Key Laboratory of Multiphase Flow in Power EngineeringXi''an Jiaotong UniversityXi''an 710049China

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Thermal impact of the parallel laying of oil/gas pipelines

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Shiyou Xuebao/Acta Petrolei Sinica 2012年第2期33卷 320-326页

作者： Wang, Qiankun Yu, Bo Sun, Changzheng Shi, Yue Zhang, Jinjun Wei, Jinjia Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249 China Shanxi Provincial Natural Gas Co. Ltd. Taiyuan 030006 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Thermal impact of the parallel laying of gas and oil pipelines remains unclear though that of two oil pipelines has been relatively well studied. A numerical simulation method combined by finite volume and finite difference was used to investigate the complex heat transfer in three typical parallel laying patterns between gas and oil pipelines: hot oil pipeline with cold gas pipeline;cold oil pipeline with hot gas pipeline and hot oil pipeline with hot gas pipeline. In terms of these three different parallel laying cases, the present paper analyzed characteristics of the maximum differential temperature range and thermal distribution of oil/gas temperatures at different intervals along pipelines relative to the single laying. The numerical simulation results can provide some guidelines for designs and safe operations of the parallel laying of oil/gas pipelines.

关键词： Thermoanalysis

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Noncondensables Effects on Subcooled Boiling of a Single Bubble in Different Gravity Levels

Noncondensables Effects on Subcooled Boiling of a Single Bub...

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第七届天地应用两相系统国际研讨会

作者： Liang ZHANG Jian-Fu ZHAO Hao PENG Hui-Xiong LI Key Laboratory of Microgravity(National Microgravity Laboratory)/CAS Institute of MechanicsChinese Academy of Sciences(CAS). Beijing100190China State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy and Power EngineeringXi’an Jiaotong University. Xi’an 710049China

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Bubble Behavior and Heat Transfer of Nucleate pool boiling on Micro-Pin-Finned Surface in Microgravity

Bubble Behavior and Heat Transfer of Nucleate pool boiling o...

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Asina Microgravity Pre-Symposium——9th China-Japan-Korea Workshop on Microgravity Sciences(第九届中日韩微重力科学学术会议暨亚洲微重力科学大会)

作者： Jin-Jia Wei Jian-Fu Zhao Yong-Hai Zhang Yan-Fang Xue Yan Long Liang Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi''an100190China Key Laboratory of Microgravity(National Microgravity Laboratory)/CASInstitute of MechanicsChinese Academy of SciencesBeijing100190China

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Spray, ignition and combustion characteristics of biodiesel and diesel fuels injected by micro-hole nozzle under ultra-high injection pressure

Spray, ignition and combustion characteristics of biodiesel ...

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8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012

作者： Kuti, Olawole Abiola Zhu, Jingyu Nishida, Keiya Wang, Xiangang Huang, Zuohua Department of Mechanical Engineering Federal University of Technology PMB 704 Akure Ondo State Nigeria Department of Mechanical System Engineering University of Hiroshima 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan Changan Automobile Corporation No. 199 Wuhong Road Yubei District Chonqing China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The spray and combustion characteristics of biodiesel (BDF) and diesel fuels injected by a micro-hole nozzle of 0.08 mm diameter under increasing injection pressure up to ultra-high value of 300 MPa were investigated in this research. The LIF-PIV (Laser Induced Fluorescence- Particle Image Velocimetry) technique was used to investigate the spray and entrained gas characteristics of the fuels while the OH chemiluminescence and two color techniques were utilized to study the ignition and combustion characteristics of the spray flames. From the research it was observed that at all injection pressures, due to inferior atomization processes, the normal velocity and total mass of the entrained gas by BDF was less compared to diesel. As a result of higher cetane number the BDF's flame ignition delay was shorter compared to diesel. The ratio of the mass flow rate of gas entrained to mass flow rate of injected fuel by BDF was less compared to diesel. Oxygen content in the BDF played a greater role in soot reduction as against the gas entrained. Copyright © 2012 by the Japan Society of Mechanical Engineers.

关键词： Biodiesel

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Assessment on the Long Term Performance of a LaNi 5 based Hydrogen Storage System

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Energy Procedia 2012年 29卷 720-730页

作者： Fusheng Yang Xinxin Cao Zaoxiao Zhang Zewei Bao Zhen Wu Nyallang Nyamsi Serge State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 P. R.China Suzhou Research Institute Xi’an Jiaotong University Suzhou 215123 P. R. China

Metal hydride represents a promising candidate for hydrogen storage, because the technique is essentially safe, compact and flexible. However, the properties of the metal hydride tend to change in repeated hydriding/dehydriding cycles, which will inevitably affect the performance of corresponding hydrogen storage system. The effect is investigated in this paper by numerical simulation using a commercial package COMSOL MULTIPHYSICS 3.5a, and a typical material- LaNi5 is chosen for discussion. Through sensitivity analysis, the influences of variation in key properties over repeated cycles on the charging time of a tank-type storage system, are evaluated and some useful conclusions are drawn.

关键词： Metal hydride Hydrogen storage system Hydriding/dehydriding cycles Charging time Reaction kinetics

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Coupling lattice Boltzmann model for simulation of thermal flows on standard lattices

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Physical Review E 2012年第1期85卷 016710-016710页

作者： Q. Li K. H. Luo Y. L. He Y. J. Gao W. Q. Tao Key Laboratory of Thermal Fluid Science and Engineering of MOE National Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Energy Technology Research Group School of Engineering Sciences University of Southampton Southampton SO17 1BJ United Kingdom Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering Tsinghua University Beijing 100084 China Department of Zoology University of Cambridge Cambridge CB2 3EJ United Kingdom

In this paper, a coupling lattice Boltzmann (LB) model for simulating thermal flows on the standard two-dimensional nine-velocity (D2Q9) lattice is developed in the framework of the double-distribution-function (DDF) approach in which the viscous heat dissipation and compression work are considered. In the model, a density distribution function is used to simulate the flow field, while a total energy distribution function is employed to simulate the temperature field. The discrete equilibrium density and total energy distribution functions are obtained from the Hermite expansions of the corresponding continuous equilibrium distribution functions. The pressure given by the equation of state of perfect gases is recovered in the macroscopic momentum and energy equations. The coupling between the momentum and energy transports makes the model applicable for general thermal flows such as non-Boussinesq flows, while the existing DDF LB models on standard lattices are usually limited to Boussinesq flows in which the temperature variation is small. Meanwhile, the simple structure and general features of the DDF LB approach are retained. The model is tested by numerical simulations of thermal Couette flow, attenuation-driven acoustic streaming, and natural convection in a square cavity with small and large temperature differences. The numerical results are found to be in good agreement with the analytical solutions and/or other numerical results reported in the literature.

关键词： LATTICE Boltzmann methods MATHEMATICAL models COMPUTER simulation THERMAL analysis ENERGY dissipation DISTRIBUTION (Probability theory) ACOUSTIC streaming DENSITY functionals

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Additional interfacial force in lattice Boltzmann models for incompressible multiphase flows

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Physical Review E 2012年第2期85卷 026704-026704页

作者： Q. Li K. H. Luo Y. J. Gao Y. L. He Energy Technology Research Group School of Engineering Sciences University of Southampton Southampton SO17 1BJ United Kingdom Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering Tsinghua University Beijing 100084 China Department of Zoology University of Cambridge Cambridge CB2 3EJ United Kingdom National Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The existing lattice Boltzmann models for incompressible multiphase flows are mostly constructed with two distribution functions: one is the order parameter distribution function, which is used to track the interface between different phases, and the other is the pressure distribution function for solving the velocity field. In this paper, it is shown that in these models the recovered momentum equation is inconsistent with the target one: an additional force is included in the recovered momentum equation. The additional force has the following features. First, it is proportional to the macroscopic velocity. Second, it is zero in every single-phase region but is nonzero in the interface. Therefore it can be interpreted as an interfacial force. To investigate the effects of the additional interfacial force, numerical simulations are carried out for the problem of Rayleigh-Taylor instability, droplet splashing on a thin liquid film, and the evolution of a falling droplet under gravity. Numerical results demonstrate that, with the increase of the velocity or the Reynolds number, the additional interfacial force will gradually have an important influence on the interface and affect the numerical accuracy.

关键词： COMPUTER simulation LATTICE Boltzmann methods multiphase flow INCOMPRESSIBLE flow (Fluid mechanics) DISTRIBUTION (Probability theory) MOMENTUM (Mechanics)

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Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube

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Chinese Science Bulletin 2011年第26期56卷 2853-2861页

作者： ZHANG YingJia HUANG ZuoHua WEI LiangJie NIU ShaoDong State Key Laboratory of Multiphase Flow in Power Engineering Xi' an Jiaotong University Xi'an 710049 China

Ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures with hydrogen amount-of-substance fractions ranging from 0–20% were measured in a shock tube *** ambient temperature varied from 1422 to 1877 K and the pressure was maintained at 0.4 MPa behind the reflected shock *** experiments were conducted at an equivalence ratio of *** fuel mixtures were diluted with nitrogen gas so that the nitrogen amount-of-substance fraction was 95%.The experimental ignition delay time of the CH4/H2 mixture decreased as the hydrogen amount-of-substance fraction *** enhancement of ignition by hydrogen addition was weak when the ambient temperature was >1750 K,and strong when the temperature was <1725 *** ignition delay time of 20% H2/80% CH4 was only one-third that of 100% CH4 at 1500 K.A modified model based on GRI-Mech 3.0 was proposed and used to calculate the ignition delay times of test *** calculated results agreed with the experimental ignition delay *** sensitivity analysis showed that HO·+H2 →H·+H2O was the main reaction for the formation of the H· at 1400 *** the hydrogen amount-of-substance fraction increased,chain branching was enhanced through the reaction H·+O2→O·+HO·,and this reduced the ignition delay *** 1800 K,the methyl radical (H3C·) became the key species that influenced the ignition of the CH4/H2/O2/N2 mixtures,and sensitivity coefficients of the chain termination reaction 2H3C·(+M)→C2H6(+M),and chain propagation reaction HO2+H3C·→HO·+CH3O decreased,which reduced the influence of hydrogen addition on the ignition of the CH4/H2 mixtures.

关键词：点火延迟时间混合物动力学激波管氢气实验氮气甲烷

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