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18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference 2012

作者： Liu, Zhaohui Bi, Qincheng Guo, Yong Ma, Xuesong Zhao, Shujun State Key Laboratory of Multiphase Flow in Power Enigeeing Xi'an Jiaotong University Xianning West Road No.28 Xi'an 710049 China Science and Technology on Scramjet Laboratory Beijing Power Machinery Research Institute Beijing 100074 China

ISBN: (纸本)9781600869310

A simplified cooling device consisting of two parallel channels is used to simulate the regeneratively cooled structure of hypersonic vehicles. A concept of "static flow instability (SFI)" is proposed in this paper. The SFI is similar to the ledinegg instability which is primary found in the two-phase flow boiling system to explain the static flow excursion. But for hydrocarbon fuel, SFI may take place in the cooling structure at high temperature and supercritical pressure. A model is constructed to analyze the mechanism of the SFI. The pressure drop vs. flow characteristic curves are calculated from the thermopysical properties of hydrocarbon fuel, which include the heat sink and density. Experiments verify that the model is feasiable, though the accuracy of density of hydrocarbon fuel is still need to improve. At a given heating power, the pressure drop vs. flow characteristic curve is a Ntype one, which makes the same pressure drop at different mass flow rates. That triggers the SFI. Chemical craking makes the SFI much more complicated. At the relevant pressure, the pressure drop vs. flow characteristic curve becomes a quintic curve. More extreme points on the curve induces more instability. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Pressure drop

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A Comprehensive Performance Evaluation Index for Metal Hydrides Reactor

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Energy Procedia 2012年 29卷 421-430页

作者： Xiangyu Meng Zewei Bao Zhen Wu Fusheng Yang Zaoxiao Zhang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 PR China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China

A comprehensive performance evaluation index that reflects the heat transfer capacity of the metal hydrides reactor was introduced, and some advantages of this index were discussed. A mathematical model of hydrogen adsorption and desorption was set up, and the validity of the model was confirmed by experimental data reported in literatures. Numerical simulations about working processes of two types of classical reactors (tubular and disc reactor) were performed. The results of comparative study show that the new index can be used in a quantitative evaluation of the reactor performance, and it is more reasonable than traditional ones.

关键词： Index Performance Reactor Metal hydrides Heat transfer

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Validation analysis of different mass transfer formula in single droplet evaporation model

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Huagong Xuebao/CIESC Journal 2012年第6期63卷 1704-1708页

作者： Xin, Juanjuan Zhou, Zhifu Xin, Hui Chen, Bin Wang, Guoxiang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China Department of Mechanical Engineering University of Akron Akron OH44325 United States

Droplet evaporation is one of the important physical processes in liquid spray. Various models have been formulated in literature to compute the mass flow rate of droplet evaporation. It is found that all these models can be written in a single formulation, with various models represented by different expressions in the driving force HM, which can be classified into three kinds, namely, classical model, mass analogy model and drift-flux model. In this paper, we perform an analysis of the assumptions involved in the derivation of the three kinds of models, and find that the drift-flux model, which takes into account the effects of Stefan flow and corrective mass transfer, is the correct expression, while the classical model ignores Stefan flow effect and the mass analogy model ignores transient effect. Then the influence of mass driving force HM on droplet evaporation is analyzed, and it is concluded that both the classical model and the mass analogy model underestimate the effect of evaporation especially at high evaporate rates.

关键词： Mass transfer

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Rapid solidification process of a water droplet due to depressurization

Rapid solidification process of a water droplet due to depre...

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第七届天地应用两相系统国际研讨会

作者： Lu Liu Qincheng Bi Guoxiang Wang Department of Power Engineering North China Electric Power University071003 BaodingChina State Key Laboratory of Multiphase FlowXi’an Jiaotong University710049 Xi’anChina State Key Laboratory of Multiphase Flow Xi’an Jiaotong University710049 Xi’anChina

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Heat Transfer Characteristics flow-Jet Combined Boiling over Micro-Pin-Finned Surfaces

Heat Transfer Characteristics Flow-Jet Combined Boiling over...

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第七届天地应用两相系统国际研讨会

作者： Y.H.Zhang J.J.Wei D.Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University28 Xianning XiluXi＇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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Asian Microgravity Pre-Symposium 9th China-Japan-Korea Workshop on Microgravity Sciences

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 University Key Laboratory of Microgravity(National Microgravity Laboratory)/CAS Institute of MechanicsChinese Academy of Sciences

Nucleate pool boiling heat transfer of micro-pin-fined surface structure is proposed for efficiently cooling electronic components with high heat flux in microgravity,and verified by experiments performed utilizing the drop tower ***-pin-fins with the dimensions of 50μm×120(am （thickness×height）(denoted as Chip PF50-120) and the space of 50μm were fabricated on the chip surface by dry etching ***-72 was used as working *** pool boiling on a smooth surface was also tested for *** were conducted in terrestrial gravity before the release of the drop capsule and in short-term microgravity during the free falling in the drop tower Beijing. The facility satisfied the safety criteria to expose the apparatus in the drop capsule to different gravitational environments varying between microgravity（μg）(10-10 g,g=9.81 m/s) in the free falling period and high-g level in the deceleration recovery system（16 go）.

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

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Critical anomaly and finite size scaling of the self-diffusion coefficient for Lennard Jones fluids by non-equilibrium molecular dynamic simulation

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Chinese Physics B 2011年第10期20卷 362-367页

作者： Ahmed Asad 吴江涛 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

We use non-equilibrium molecular dynamics simulations to calculate the self-diffusion coefficient, D, of a Lennard Jones fluid over a wide density and temperature range. The change in self-diffusion coefficient with temperature decreases by increasing density. For density ρ＊ = ρσ3 = 0.84 we observe a peak at the value of the self-diffusion coefficient and the critical temperature T＊ = kT/ε = 1.25. The value of the self-diffusion coefficient strongly depends on system size. The data of the self-diffusion coefficient are fitted to a simple analytic relation based on hydrodynamic arguments. This correction scales as N-α, where α is an adjustable parameter and N is the number of particles. It is observed that the values of a 〈 1 provide quite a good correction to the simulation data. The system size dependence is very strong for lower densities, but it is not as strong for higher densities. The self-diffusion coefficient calculated with non-equilibrium molecular dynamic simulations at different temperatures and densities is in good agreement with other calculations fronl the literature.

关键词： self-diffusion coefficient non-equilibrium molecular dynamic simulation Lennard Jonesfluid critical dynamics

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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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Asian Microgravity Pre-Symposium 9th China-Japan-Korea Workshop on Microgravity Sciences

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 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Key Laboratory of Microgravity.Institute of Mechanics Chinese Academy of Sciences

Boiling is a very complex and illusive process with very high efficiency of heat *** many sub-processes in boiling phenomenon,gravity can be involved and play much important *** reveal its influence,long-term,steady microgravity are ***,the opportunity is much ***,ground-based short-term microgravity experiment becomes an attractive alternative. Experiments of transient pool boiling of highly subcooled FC-72 on a smooth silicon chip with the dimensions of 10×10x0.5 mm3 were studied in short-term microgravity condition utilizing the drop tower *** heating currents were switched on near the release of the drop *** bubble behaviors and heat transfer of air-dissolved FC-72 on the silicon chip were obtained at the bulk

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

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Factors affecting corrosion behavior of SS316L as bipolar plate material in PEMFC cathode environments

Factors affecting corrosion behavior of SS316L as bipolar pl...

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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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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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