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Materials Today Catalysis 2023年 3卷

作者： Liao, Chen Jing, Wenhao Wang, Feng Liu, Ya International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China

Constructing a Z-scheme heterostructure is of great significance to achieve efficient photocatalytic CO2 conversion without sacrificial reagents. However, the fabrication of a well-suited Z-scheme remains a challenge. In this work, we constructed a Z-scheme system with a suitable band structure by in-situ hydrothermal growth of In2S3 nanosheets on electrospun Fe3C/Carbon fibers with 3D structure. The Z-scheme electron transport path is verified by the calculation of the energy band structure calculation and the method of photodeposition, indicating that In2S3 and Fe3C are reduction reaction sites and oxidation reaction sites respectively. Carbon fibers serve as both the skeleton of the 3D structure and the electron mediator from Fe3C to In2S3. Moreover, the DFT calculation demonstrates that the introduction of Fe3C can reduce the energy barrier of *CO and *COH coupling on In2S3, and weaken the bonding of In-S, thereby enhancing the product selectivity towards acetate. Owing to the efficient charge transfer of the Z-scheme system, the photocorrosion in In2S3 is also greatly reduced, showing a relatively stable chemical composition after several hours of reaction. Compared with In2S3 and Fe3C/C, In2S3-C/Fe3C composites showed a significantly increased acetate evolution rate of 11.33 μmol/h/g without any sacrificial reagents. This work provides important insights into the design and research of the photocatalyst system that combines a monolithic 3D structure and a Z-scheme charge flow for efficient CO2 conversion. © 2023 The Authors

关键词： Carbon fibers

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CFD simulation of thermal hydraulic characteristics in a typical upper plenum of RPV

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Frontiers in Energy 2021年第4期15卷 930-945页

作者： Mingjun WANG Lianfa WANG Yingjie WANG Wenxi TIAN Jian DENG Guanghui SU Suizheng QI State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

A comparative computational fluid dynamics(CFD)study was conducted on the three different types of pressurized water reactor(PWR)upper plenum,named TYPE 1(support columns(SCs)and control rod guide tubes(CRGTs)with two large windows),TYPE 2(SCs and CRGTs without windows),and TYPE 3(two parallel perforated barrel shells and CRGTs).First,three types of upper plenum geometry information were collected,simplified,and adopted into the BORA facility,which is a 1/5 scale system of the four-loop PWR ***,the geometry,including the upper half core,upper plenum region,and hot legs,was built using the Salome *** that,an unsteady calculation to simulate the reactor balance operation at hot full power scenario was ***,the differences of flowrate distribution at the core outlet and temperature distribution and transverse velocity inside the hot legs with different upper plenum internals were *** results suggest that TYPE 1 upper plenum internals cause the largest flowrate difference at the core outlet while TYPE 3 leads to the most even distributed *** distribution and evolution pattern of the tangential velocity inside hot legs is highly dependent on the upper plenum *** counter-rotating swirls exist inside the TYPE 1 hot leg and only one swirl revolving around the hog leg axis exist inside the TYPE 2 hot *** TYPE 3,two swirls like that of TYPE 1 rotating around the hot leg axis significantly increase the temperature homogenization *** research provides meaningful guidelines for the future optimization and design of advanced PWR upper plenum internal structures.

关键词： pressurized water reactor(PWR) upper plenum internal structures temperature distribution computational fluid dynamics(CFD)

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Hierarchically microporous membranes for highly energy-efficient gas separations

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2023年第3期1卷 376-387页

作者： Shuangjiang Luo Tianliang Han Can Wang Ying Sun Hongjun Zhang Ruilan Guo Suojiang Zhang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Chemical and Biomolecular Engineering University of Notre DameNotre DameIN 46556USA Longzihu New Energy Laboratory Zhengzhou 450000China Henan University Jinming RoadKaifeng475004China

The implementation of synthetic polymer membranes in gas separations,ranging from natural gas sweetening,hydrogen separation,helium recovery,carbon capture,oxygen/nitrogen enrichment,etc.,has stimulated the vigorous development of high-performance membrane ***,size-sieving types of synthetic polymer membranes are frequently subject to a trade-off between permeability and selectivity,primarily due to the lack of ability to boost fractional free volume while simultaneously controlling the micropore size ***,we review recent research progress on microporosity manipulation in high-free-volume polymeric gas separation membranes and their gas separation performance,with an emphasis on membranes with hourglass-shaped or bimodally distributed ***-of-the-art strategies to construct tailorable and hierarchically microporous structures,microporosity characterization,and microcavity architecture that govern gas separation performance are systematically summarized.

关键词： Gas separation membranes Hierarchical microporosity Micropore size distribution Configurational free volume Solution-diffusion mechanism

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Selective laser melted high Ni content TiNi alloy with superior superelasticity and hardwearing

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Journal of Materials Science & Technology 2022年第21期116卷 246-257页

作者： Hui Shen Qingquan Zhang Ying Yang Yang Ren Yanbao Guo Yafeng Yang Zhonghan Li Zhiwei Xiong Xiangguang Kong Zhihui Zhang Fangmin Guo Lishan Cui Shijie Hao State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China The Key Laboratory of Bionic Engineering(Ministry of Education)and the College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Department of Physics City University of Hong KongKowloonHong KongChina College of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

TiNi alloys with high content Ni(52-55 at.%)are perfectly suitable for preparing wear-and corrosionresistant parts that service on the space station,spacecraft,and submarine,because of their superior superelasticity,high strength,and ***,the fabrication of complicated Ni-rich TiNi parts by the traditional machining method often faces problems of poor precision,low efficiency,and high *** this work,we succeed in preparing an excellent Ti_(47)Ni_(53) alloy by selective laser melting(SLM),and thus,open a new way for the efficient and precise formation of complicated Ni-rich TiNi parts with superelasticity and *** optimized processing window for compact parts without defects is *** elaborately fabricated Ti_(47)Ni_(53) alloy exhibited a breaking strain of 11%,a breaking stress of 2.0 GPa,a superelastic strain of 9%,and a better hardwearing than that of casting and quenched Ti_(47)Ni_(53) ***,the microstructure,phase transformation,and deformation,as well as their influence mechanisms are investigated by in situ transmission electron microscope(TEM)and high-energy X-ray diffraction(HE-XRD).The results obtained are of significance for both fundamental research and technological applications of SLM-fabricated high Ni content TiNi alloys.

关键词： Selective laser melting High Ni content TiNi Superelasticity Wear In situ high-energy X-ray diffraction Microstructure

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Vapor-liquid equilibrium of H2/CO2 and H2/N2/CO2 mixture, the liquefaction technology related to the supercritical water gasification products

Vapor-liquid equilibrium of H2/CO2 and H2/N2/CO2 mixture, th...

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International Multidisciplinary Conference on Computer and Energy Science (SpliTech)

作者： Hongtu Wu Hui Jin School of Energy and Power Engineering Xi’an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi’an China

In this paper, the dew point and liquid phase composition of H 2 /CO 2 and H 2 /CO 2 /N 2 mixtures at phase equilibrium calculated by PR-BM equation and Van Der Waal mixing rule with commercial MATLAB software are introduced, it is of theoretical significance for the wide application of the products of supercritical water gasification. First, the results obtained by the self-programming code are verified with the experimental data, the experimental data and simulation results of two kinds of CO 2 /H 2 mixtures and two kinds of CO 2 /N 2 /H 2 mixtures were compared. The average percentage deviation was 2.69%, 4.05%, 2.22%, 1.20%, respectively. Thus the absolute deviations of the mixtures are within the acceptable range, therefore, the model proposed in this paper can well predict the dew point of the mixtures composed of H 2 /CO 2 or H 2 /CO 2 /N 2 .Afterwards, the dew point and the CO 2 content in the liquid phase of common H 2 /CO 2 and H 2 /CO 2 /N 2 vapor mixtures in supercritical water gasification products were predicted, and a series of analysis and discussion were conducted on the predicted results finally.

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A Preliminary Study on the Blistering Behavior of Dispersion Plate-Type Fuel Assembly

SSRN

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SSRN 2024年

作者： Yu, Songjiao Zhang, Kui Yang, Yiming Liu, Yumin Tian, Wenxi Qiu, Suizheng School of Nuclear Science and Technology Shanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

The dispersion plate fuel assembly, owing to its favorable characteristics of low temperature gradient, high stability, and excellent thermal conductivity, has become a focal point in the research of novel high-performance fuel elements. However, the current literature lacks a comprehensive understanding of the fuel plate's performance, particularly with regard to the bubbling phenomenon in the fuel plate cladding. In this study, we have implemented a fission gas release model, building upon previous analyses of fuel plate performance under steady-state operation. By comparing our calculation results with the Forsberg-Massih model, we find a close correspondence in trends, thereby validating the accuracy of our computational approach. Furthermore, we utilize the upgraded FROBA-PLATEs code to predict the blistering behavior of fuel plates under specific quasi-steady-state conditions. Our results demonstrate that the occurrence position and threshold temperature of blistering in the fuel assembly can be precisely predicted using this approach. © 2024, The Authors. All rights reserved.

关键词： Fission products

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Numerical Simulation Investigating the Influence of Varied Stack Parameters on the Energy Conversion in Thermoacoutic Engines

SSRN

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SSRN 2024年

作者： Yao, Chen Zhou, Yao Liu, Jiping Yan, Junjie MOE Key Laboratory of Thermal Fluid Science Engineering Xi’an Jiaotong Univeristy Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong Univeristy Xi’an710049 China

The stack is a crucial component of the thermoacoustic heat engine, influencing its capacity to generate stable pressure amplitude and enhance efficiency. Utilizing the discontinuous Galerkin (DG) method, fully compressible Navier-Stokes equations were solved to simulate the energy exchange between the stack and surrounding air under various conditions.(1) Simulations were conducted under different stack wall boundary conditions, including linear temperature distribution wall, isothermal wall, and adiabatic wall. The work performed by 1 kg of gas at a specific position during one cycle was defined as local energy density to analyse the effect of different stack spacing, stack length and stack thickness. (2) Too small a stack spacing causes the inability to generate pressure amplitude. Increasing the stack spacing continuously enhances the generated pressure amplitude, with the energy density distribution near the hot heat exchanger becoming more significant. As the stack spacing continues to increase, the energy density decreases at positions farther from the wall, leading to a reduction in pressure amplitude. The generated acoustic streaming intensity diminishes faster with the continuous increase in stack spacing. (3) A smaller stack length results in reduced viscous dissipation at the wall, leading to a larger generated pressure amplitude. However, shorter stack lengths cause increased gas oscillation displacement, resulting in lower energy density concentrate around the stack. This raises the load on the two heat exchangers, consequently reducing the overall efficiency. (4) The pressure amplitude decreases with the increase in stack thickness. The vortex intensity at the gap between the hot heat exchanger and the stack increases with the stack thickness, leading to higher viscous losses for the fluid passing through this region. Consequently, the performance of the thermoacoustic engine declines. These findings provide valuable guidance for the design of thermoa

关键词： Numerical methods

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Comparative Life Cycle Analysis of Battery Energy Storage Technologies for Grid Applications: Case Study in China 35

Comparative Life Cycle Analysis of Battery Energy Storage Te...

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35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022

作者： Han, Xiaoqu Li, Yanxin Chang, Hongzhang Chen, Nana Huang, Xiaofan Tang, Xiaoping Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Huadian Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9788774756989

With ever increasing penetration of renewable energy sources into the power grid, the development and commercialization of large-scale energy storage system (ESS) have been accelerated. It is of great significance to evaluate the sustainability of ESSs for grid applications. In the present work, a comprehensive life cycle inventory analysis model, which involves the manufacturing, usage, transportation and recycling processes, was developed for lithium iron phosphate battery (LIPB), nickel manganese cobalt oxide battery (NMCB) and vanadium redox flow battery (VRFB). The functional unit was 1MWh of delivered energy from ESS to the grid. The ReCiPe 2016 (H) method was selected and data analysis was carried out in SimaPro software. The global warming potential (GWP) of LIPB, NMCB and VRFB in the grid peak-shaving scenario were obtained as 129 kgCO2-eq/MWh, 146 kgCO2-eq/MWh and 365 kgCO2-eq/MWh, respectively. GWP of different batteries in renewable energy sources (photovoltaic and wind power) was also predicted based on the developed model. The key materials that contributed significantly to GWP were also identified. Moreover, the future trend in GWP was analyzed based on the carbon peaking and carbon neutrality goals. It is indicated that GWP of LIPB, NMCB and VRFB in the announced pledges scenario could be reduced to approximately 75% in 2030, and 24%~41% in 2050, respectively. Parametric analysis was then carried out, indicating that the round-trip efficiency and number of daily cycles exhibited the significant influence. The results would promote the environment, policy and business model optimization for large-scale energy storage in the low-carbon power systems. © Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.

关键词： Life cycle

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A Case Study Applying Mesoscience to Deep Learning

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engineering 2024年第8期39卷 84-93页

作者： Li Guo Fanyong Meng Pengfei Qin Zhaojie Xia Qi Chang Jianhua Chen Jinghai Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

In this paper,we propose mesoscience-guided deep learning(MGDL),a deep learning modeling approach guided by mesoscience,to study complex *** establishing sample dataset based on the same system evolution data,different from the operation of conventional deep learning method,MGDL introduces the treatment of the dominant mechanisms of complex system and interactions between them according to the principle of compromise in competition(CIC)in *** constraints are then integrated into the loss function to guide the deep learning *** methods are proposed for the addition of mesoscience *** physical interpretability of the model-training process is improved by MGDL because guidance and constraints based on physical principles are *** was evaluated using a bubbling bed modeling case and compared with traditional *** a much smaller training dataset,the results indicate that mesoscience-constraint-based model training has distinct advantages in terms of convergence stability and prediction accuracy,and it can be widely applied to various neural network *** MGDL approach proposed in this paper is a novel method for utilizing the physical background information during deep learning model *** exploration of MGDL will be continued in the future.

关键词： Mesoscience Deep learning Complex system Gas-solid system Bubbling bed

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Molecular dynamics study on bubble nucleation characteristics on rectangular Nano-Grooved surfaces

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Journal of Molecular Liquids 2025年 420卷

作者： Li, Zhibin Lou, Jiacheng Wu, Xiaoyi Li, Xujun Chang, Fucheng Wang, Hengyuan Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China National Key Lab of Aerospace Power System and Plasma Technology School of Mechanical Engineering Xi'an Jiaotong University Xi'an710049 China

The micro/nanoscale structures on metal surfaces are of significant research interest for boiling heat transfer and exhibit great application potential in the thermal management of high-power electronic devices. This study employs the molecular dynamics simulation method to investigate the boiling heat transfer characteristics of hydrophilic rectangular shallow nano-groove structures, comparing them with the smooth surface. The phase transition heat transfer characteristics of liquid films on the smooth surface, single rectangular groove (SRG) surface, and overlapping rectangular groove (ORG) surface are revealed by analyzing the variations of parameters such as energy contour diagrams, bubble volume, liquid film temperature, and average potential energy. The research results indicate that water molecules are in a solid-like state within shallow grooves, while the nucleation sites of initial bubbles form randomly outside the grooves. During the initial heating and bubble growth, the initial nucleation time and bubble growth rate of ORG are slower than those of SRG, due to the small rectangular groove on ORG that diminishes the energy transfer efficiency. During bubble formation and growth, the average kinetic energy within the liquid film fluctuates at the nucleation moment in the critical nucleation region, and the average potential energy rises from −0.083 eV. These findings provide a theoretical basis for the micro/nanoscale structure design of vapor-liquid phase transition thermal management devices. © 2024 Elsevier B.V.

关键词： Kinetic energy

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