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2017 Transactions of the American Nuclear Society, ANS 2017

作者： Zhang, Dalin Song, Ping Wang, Shibao Wang, Xin'an Chen, Jing Yue, Nina Tian, Wenxi Qiu, Suizheng Su, G.H. School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an710049 China

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Experimental study on pressure drop characteristic of wet air with ash particles in a horizontal tube bundle heat exchanger

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Energy Procedia 2017年 142卷 4010-4015页

作者： Yuanzhi Qin Jingying Yang Haibo Dai Jinshi Wang Ming Liu Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The pressure drop characteristic of wet air with ash particles in a horizontal tube bundle heat exchanger was studied experimentally. The variations with time, effects of water vapor mass fractions and mainstream velocities on pressure drop characteristic were presented. Experimentally results showed that with the increase in the time, the pressure drop coefficient firstly increased then became stable. In the case of wet air with ash particles, the pressure drop coefficient increased with the increase of the water mass fraction and decreased with the increase of the mainstream velocity. Compared with wet air without ash particles, the pressure drop coefficients were higher in the presence of ash particles, due to ash deposition.

关键词： Pressure drop coefficient Heat exchanger wet air Ash particles

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Chaotic Characteristics Analysis on Recognition of Steam Plume flow Pattern of Direct Contact Condensation in a Rectangular Channel

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Energy Procedia 2017年 142卷 3827-3832页

作者： Binbin Qiu Jia Liu Jiping Liu Junjie Yan Xiaoping Yang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Chaotic characteristics of direct contact condensation(DCC) for steam jet in subcooled water in a rectangular channel were analyzed at subcooled water temperature of 30 ℃. The steam mass flux and Reynolds number of subcooled water were in the range of 250-600kg/(m 2 s) and 78,000-172,000 respectively. Three different flow patterns, bubble flow, oscillation jet and stable jet, were observed. Correlation dimension( D 2 ) changes with flow patterns. For bubble flow, oscillation jet and stable jet, the corresponding correlation dimension values increase and are in the ranges of 9.68~10.30, 10.03~11.17 and 11.10~12.62, respectively. Different flow patterns have different Hurst exponent( H ). From the range of correlation dimensions and Hurst exponents, the flow pattern of steam jet can be recognized without looking the picture of steam plume. This result is very important for flow pattern recognition without the observation windows.

关键词： flow pattern recognition chaotic characteristics correlation dimension Hurst exponent

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Aeroelastic Analysis of Preset Angle for A Typical Airfoil Section with Cubic Nonlinear Stiffness

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Journal of Physics: Conference Series 2019年第1期1300卷 012100-012100页

作者： Nan, Guofang Ding, Di Wang, Weitao School of Energy and Power Engineering University of Shanghai for Science and Technology China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering 516 Jungong Road 200093 Shanghai P.R. China School of Energy and Power Engineering University of Shanghai for Science and Technology China

The influences of the preset angle on the dynamic responses of the typical airfoil section with cubic nonlinear stiffness were investigated under consideration of the aerodynamic flutter onset due to certain angle of attack. The typical airfoil model with cubic nonlinear stiffness is developed to analyze the plunging and the pitching motions for the airfoil section. Based on the Grossman’s quasi steady aerodynamic model, the aerodynamic lift and the moment can be obtained and then the equation of motion for the airfoil section is derived by applying the Lagrange theorem. The effects of the preset angle and the oncoming flow speed on the nonlinear dynamics are analyzed by means of the bifurcation diagram, the frequency-amplitude diagram, the time history, etc. Simulation results show that the preset angle influences the intensity of the vibration, moderate or severe, stable or unstable, even under certain circumstance, the jump and chaos phenomenon occur; and the oncoming flow speed affects the distribution of the vibration energy for the plunging and the pitching motions. The unstable stall region for the responding parameters should be avoided to keep the airfoil safe in engineering practice. Some qualitative and quantitative rules are obtained for the airfoil design and the flutter suppression.

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Experimental Study on Cohesiveness Characteristics of Raw Cement Ash at Moderate Temperature

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Energy Procedia 2017年 105卷 4674-4679页

作者： Tao Han Chang’an Wang Qi Cao Wufeng Chen Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Raw cement ash deposition in SP boilers gives rise to serious operation problems. In the present, mechanism of raw cement ash deposition is still unclear because the ash components, gas atmosphere and gas temperature are quite different from existing studies. The characteristics of cohesiveness of raw cement ash in moderate temperature were investigated in a lab-scale electric furnace. Three typical raw cement ashes were selected as samples, three base plates, including rough steel plate, smooth steel plate, organic glass plate were studied. Ball-impacting method was adopted to evaluate the cohesiveness of ash. Experimental results show that, the ash cohesiveness is mainly dependent on the components of ash, and the material property of base plate, while it exhibits little relationship with the roughness of the plate surface. Low-melting substances appear during ash deposition on steel plate. The results reveal that ferrum possibly has catalytic to some low-melting substances forming.

关键词： deposition cohesiveness roughness low-melting sunbstances

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Microstructure evolution and properties evaluation of a novel bondline based on Cu@Sn Preform during temperature treatment

Microstructure evolution and properties evaluation of a nove...

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第十九届国际电子封装技术会议(ICEPT 2018)

作者： Hongyan xu Ju Xu Puqi Ning Jianqiang Li Beijing Engineering Laboratory of Electrical Drive System & Power Electronic Device Packaging Techno State Key Laboratory of Multiphase Complex System Institute of Process EngineeringChinese Academy o

The microstructure and properties of Cu@Cu3Sn@Cu6Sn5three-dimensional network bonding interconnections based on Cu@Sn preform was *** through holes were observed at the bulk in as-reflowed,aged and temperature cycling *** evolution and phase transformation during thermal treatment test were studied,the shear strength of three-dimensional network bondlines for as-reflowed and thermal treating samples were compared and *** phase composition of as-reflowed interconnects was Cu/Cu6Sn5 and transformed to Cu/Cu3Sn/Cu6Sn5 after thermal *** failure modes of as-reflowed,aged and temperature cycling test were found in three-dimensional network structure *** average shear strength of the as-reflowed and the thermal treatment bonding interconnections are 49.5 Mpa and 24.9 Mpa,respectively,and crack initiated and propagated that perpendicular to substrate during the aging *** fracture surfaces of the temperature treatment bonding interconnections after shearing test were characterized in *** results show that the Cu3Sn phases in Cu@Cu3Sn@Cu6Sn5 three-dimensional network structure affected its strength and fracture *** Cu-rich substrate side at the fracture surfaces is always regular while the bulk phases are often accompanied by shear bands and dimples.

关键词： microstructure evolution as-reflowed aging test temperature cycling shearing strength

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Effect of prompt dissociation of formyl radicals on 1,3,5-trioxane laminar flame speeds at high pressure 55

Effect of prompt dissociation of formyl radicals on 1,3,5-tr...

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55th AIAA Aerospace Sciences Meeting

作者： Zhao, Hao Fu, Jiapeng Ju, Yiguang Department of Mechanical and Aerospace Engineering Princeton University Engineering Quad Olden Street PrincetonNJ08544 United States Department of Power Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9781624104473

Flame speeds of all hydrocarbon fuels are very sensitive to the reactions of formaldehyde (CH2O) and formyl radical (HCO). In this paper, we studied the prompt dissociation effect of HCO on the flame speeds of trioxane and formaldehyde up to 9 atm. The effects of prompt HCO dissociation were examined at high pressure. Different kinetic models were compared against the experimental results. The results showed there was a significant effect of the HCO prompt reaction on the flame speed in a broad range of pressure and equivalence ratio. At higher pressure, it was observed that the prompt effect was reduced due to the third-body collision effect. However, with the increase of O2mole fraction, the prompt effect was enhanced. Comparison showed that HP Mech with the inclusion of the prompt reactions had a better prediction at lean and ultra-lean conditions than other mechanisms. The improved prediction of the flame speed indicated that the prompt effect needed to be considered in the model development of hydrocarbon and oxygenated fuel combustion. © 2017 by Hao Zhao, Jiapeng Fu, and Yiguang Ju.

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Ash Deposition and Alkali Metal Migration during Zhundong High-alkali Coal Gasification

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Energy Procedia 2017年 105卷 1350-1355页

作者： Guangyu Li Chang’an Wang Pengqian Wang Yongbo Du Xuan Liu Wufeng Chen Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Ash deposition is particularly serious during Zhundong coal combustion/gasification due to its high alkali metal content, which causes great troubles and limits its utilization. This paper focuses on the ash deposition characteristics and migration disciplinarian of akali metal during Zhundong coal gasification varing with different conditions, such as ash deposition temperature, gasification temperature, O 2 /coal, steam/coal, and deposition time. Experimental result indicates that gasification conditions play a significant role on ash deposition. The root cause of severe fouling is the high content of Na in Zhundong coal, most of which is water-soluble. Besides, the contents of Na, Fe, S, Cl in ash are obviously changed with flue gas temperature increasing, indicating these elements have great influence on ash deposition, and the migration of Na, Fe and Cl presents similar variation during deposition. In addition, Na deposits mainly above 873 K, and Fe gains enrichment in ash at various temperatures. With the increase of gasification temperature, the content of Na in the ash is increased, which could exacerbate ash deposition. Both O 2 /coal and steam/coal have a certain influence on migration of elements, and the increases of O 2 /coal and steam/coal can relieve the ash fouling phenomena. Deposited ash on heating surface will react with Na in flue gas at high temperature, leading to the increase of content of Na in the ash with deposition time increasing.

关键词： Coal gasification Zhundong coal alkali metal ash Deposition

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Insights into Charge Transfer at an Atomically Precise Nanocluster/Semiconductor Interface

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Angewandte Chemie 2020年第20期132卷

作者： Yu Wang Xiao‐He Liu Qiankun Wang Martin Quick Sergey A. Kovalenko Qing‐Yun Chen Norbert Koch Nicola Pinna Institut für Chemie and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Strasse 2 12489 Berlin Germany International Research Center for Renewable Energy (IRCRE) and State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China Institut für Physik and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Strasse 6 12489 Berlin Germany

The deposition of an atomically precise nanocluster, for example, Ag 44 (SR) 30 , onto a large‐band‐gap semiconductor such as TiO 2 allows a clear interface to be obtained to study charge transfer at the interface. Changing the light source from visible light to simulated sunlight led to a three orders of magnitude enhancement in the photocatalytic H 2 generation, with the H 2 production rate reaching 7.4 mmol h −1 g catalyst −1 . This is five times higher than that of TiO 2 modified with Ag nanoparticles and even comparable to that of TiO 2 modified with Pt nanoparticles under similar conditions. Energy band alignment and transient absorption spectroscopy reveal that the role of the metal clusters is different from that of both organometallic complexes and plasmonic nanoparticles: A type II heterojunction charge‐transfer route is achieved under UV/Vis irradiation, with the cluster serving as a small‐band‐gap semiconductor. This results in the clusters acting as co‐catalysts rather than merely photosensitizers.

关键词： Ladungstransfer Cokatalysatoren Photosensibilisator Silber-Nanocluster

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Dynamic Pore-Scale Dissolution by CO2-Saturated Brine in Carbonates: Impact of Homogeneous Versus Fractured Versus Vuggy Pore Structure

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Water Resources Research 2020年第4期56卷 e2019WR026112-e2019WR026112页

作者： Yongfei Yang Yingwen Li Jun Yao Stefan Iglauer Linda Luquot Kai Zhang Hai Sun Lei Zhang Wenhui Song Zhiyu Wang Key Laboratory of Unconventional Oil and Gas Development China University of Petroleum (East China) Ministry of Education Qingdao China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao China School of Engineering Petroleum Engineering Discipline Edith Cowan University Joondalup Western Australia Australia Université Montpellier CNRS Geosciences Montpellier Laboratory Montpellier France

Limestone pore structure strongly influences dissolution and associated reactive transport. These effects are critical in limestone diagenesis and but also in engineering operations such as carbon capture and storage (CCS). However, detailed studies on how CO 2 -enriched (acidic) brine changes this pore structure at relevant reservoir storage conditions are very limited. Thus, to provide further quantitative information and more fundamental understanding about these key processes, we studied the dissolution patterns of a homogeneous, a fractured, and a vuggy limestone when flooded with CO 2 -saturated brine at representative storage conditions. The pore structured of these limestones showed drastically different responses to the acidic brine flood. As such, preferential channels surrounded by branched channels were formed in the homogeneous sample, while fractures became the main flow path in the fractured sample. In contrast, only one dominant channel formed in the vuggy sample, which resulted in a sharp permeability increase. These dissolution patterns reflect the associated Damköhler number, which significantly lower in the homogeneous, representing uniform dissolution. However, after injecting sufficient reactive fluid (1,000 PV), this uniform dissolution pattern transformed into a single preferential channel growth. Moreover, we conclude that increasing complexity of the pore geometry leads to more nonuniform dissolution. These dissolution patterns indicate the effect of initial pore structure on preferential channel growth and reaction transport. Our work provides key fundamental data for further quantifying limestone dissolution patterns in CCS, indicating that the CO 2 injection may cause the reactivation of geological faults and damage around wellbore, thus aids in the implementation of industrial-scale CCS. The impact of limestone pore structure on reactive transport was analyzed experimentally and computationally The dissolution patterns of homogeneous, f

关键词： Carbonate dissolution pattern Carbon storage Pore-scale Micro-CT Permeability changes Pe -Da distribution

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