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International Multidisciplinary Conference on Computer and Energy Science (SpliTech)

作者： Junying Wang Hui Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (数字)9789532901351

ISBN: (纸本)9798350390797

In this work, solubility parameters of the supercritical carbon dioxide (SC-CO2) system and the SC-CO2 adding cosolvent systems were calculated using molecular dynamics simulation. How temperature and pressure changes affected the solubility parameter were studied by molecular dynamics simulation. In addition, the mechanism of interaction between cosolvent and SC-CO2 was investigated. It was discovered that the SC-CO2 solubility parameter rose with rising pressure at constant temperature and fell with rising temperature at constant pressure. Additionally, it is obvious that increasing the solubility parameter of the SC-CO2 system as a whole can be achieved by adding a specific quantity of cosolvent. The solubility parameter of the SC-CO2-cosolvent system increased with increasing cosolvent content. The addition of cosolvent to improve the solubility parameter works by increasing the combined system's polar strength. The hydrogen bonding interaction energy has the greatest impact on the increase of solubility parameter.

关键词： Ethanol Hydrogen Carbon dioxide Bonding Carbon

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Multi-objective optimization of a novel gas-liquid cylindrical cyclone based on response surface methodology

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Chemical engineering Research and Design 2024年 212卷 1-13页

作者： Wang, Siqi Jiang, Minghu Zhang, Shuang Yu, Shiqi Lu, Mengmei Zhao, Lixin School of Mechanical Science and Engineering Northeast Petroleum University Heilongjiang Daqing163318 China Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention Heilongjiang Daqing163318 China State Key Laboratory of Continental Shale Oil Heilongjiang Daqing163318 China

Currently, most major oilfields in China have reached a stage of high water content, where the extracted fluid is often accompanied by significant volumes of associated gas. This situation increases extraction costs and elevates safety risks. To address these challenges, this paper presents an innovative redesign of the traditional gas-liquid cylindrical cyclone (GLCC) by applying composite mechanics to improve the inner cone structure. The new design is tailored for conditions with high gas content and flow rates. Using response surface optimization, the optimal structural parameters for the separator were identified: an inlet area of 881 mm2, a column diameter of 110 mm, and an inner cone height of 189 mm. Furthermore, the study integrates numerical simulation with experimental research to compare and analyze the flow characteristics and separation performance of the GLCC before and after optimization. The results demonstrate that the optimized GLCC achieves a separation efficiency of 93.2 %, an improvement of 21.2 percentage points over the initial design, with a maximum pressure loss of 0.0621 MPa. The experimental findings and numerical simulations show strong agreement, confirming the efficacy of the new design. © 2024 Institution of Chemical Engineers

关键词： Cyclone separators

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Research on the THMC Coupling Model for Enhanced Geothermal Systems Based on the Framework of EDFM 29th

Research on the THMC Coupling Model for Enhanced Geothermal ...

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29th International Conference on Computational and Experimental engineering and Sciences, ICCES 2023

作者： Zhang, Weitao Han, Dongxu Jiao, Kaituo Chen, Yujie Yuan, Qing Gong, Liang Yu, Bo Qingdao266580 China Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil and Gas Development School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing102617 China State Key Laboratory of Multiphase Flow in Power Engineering School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9783031429866

The Enhanced Geothermal System (EGS) involves a complex thermo-hydro-mechanical-chemical (THMC) coupling process during long-term heat extraction. However, many models used to solve fractured reservoir problems are computationally time-consuming, especially when dealing with reservoir-scale engineering problems. To address this challenge, this paper proposes a novel THMC coupling model that solves the governing equations using a unified FVM framework based on the embedded discrete fracture model (EDFM). The accuracy of the model is confirmed by comparing the THC coupling and displacement (M) results with the Fully Resolved Solution Method (FRSM) from MRST software and COMSOL, respectively. Moreover, the model developed is utilized to simulate and analyze the spatiotemporal behavior of pressure, temperature, concentration, and mechanical deformation in EGS. The results suggest that the model is appropriate for effectively assessing the long-term production performance of EGS. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Finite volume method

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Electrocatalytic Cleavage of C-C Bonds in Lignin Models Using Nonmetallic Catalysts at Ambient Conditions

Chem and Bio Engineering

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Chem and Bio engineering 2024年第4期1卷 357-365页

作者： Liu, Guangyong Zhai, Ziqi Lu, Yumiao Lu, JunFeng Wang, Yanlei Liang, Shijing He, Hongyan Jiang, Lilong National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University Fujian Fuzhou350002 China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Longzihu New Energy Laboratory Zhengzhou Institute of Emerging Industrial Technology Zhengzhou450000 China

Lignin, characterized by its amorphous, heavily polymerized structure, is a primary natural source of aromatic compounds, yet its complex constitution poses considerable challenges in its transformation and utilization. Therefore, the selective cleavage of C-C bonds represents a critical and challenging step in lignin degradation, essential for the production of high-value aromatic compounds. In this study, we report a simple electrocatalytic approach for lignin valorization via C-C bond cleavage by developing a nonmetallic electrocatalyst of carbon-based materials. It is found that the hydrophilicity and hydrophobicity of the electrocatalyst have a significant effect on the degradation process. Under mild conditions, the hydrophilic carbon paper exhibits 100% substrate conversion, yielding 97% benzaldehyde and 96% quinone with ionic liquid electrolytes. The mechanism study shows that the carbon catalyst with higher surface defects favors electron transfer in the oxidative cleavage process of C-C bonds. These results signify a substantial advancement in lignin degradation, offering an environmentally friendly, metal-free electrochemical route. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Quinone

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A volume of fluid simulation of the steady deformation and the drag of a single droplet in a flowing gas

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Journal of Hydrodynamics 2021年第2期33卷 334-346页

作者： Zhi-bin Wang Zhong-wei Yang Lie-jin Guo Ren-jie Zhao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChendu 610500China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

A method is proposed to investigate the steady deformation and the drag of a single droplet in a flowing gas at a high Reynolds *** volume of fluid(VOF)method is used to model the droplet surface *** direct numerical simulation(DNS)method is used to model the gas flow *** order to avoid the effect of the droplet acceleration on the drag and reduce the computation cost,a body force is added to the droplet to make it fixed at a constant *** body force is determined by using the Newton iteration *** simulated droplet aspect ratio and the drag coefficient agree well with the published experimental ***,the sources of the drag are analyzed and the effect of the Reynolds number and the Weber numbers on the droplet deformation and the drag are *** drag mainly comes from the pressure difference between the droplet-leading zone and the trailing zone,and the turbulence wake would increase the drag.

关键词： Droplet deformation steady drag volume of fluid(VOF) turbulent flow drag force

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Sustainability Assessment of Typical Energy Storage Technologies for Peak Shaving Scenarios Based on the Full Life Cycle 36

Sustainability Assessment of Typical Energy Storage Technolo...

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36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2023

作者： Chen, Nana Han, Xiaoqu Li, Yanxin Huang, Xiaofan Li, Jiarui 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)9781713874928

With more renewable energy sources (RES) which are inherent intermittent and unpredictable connecting with power grid, various stability problems occur, among which the peak load regulation is the most prominent. Energy storage systems (ESSs) are essential for buffering the electricity grid. Selecting the most suitable energy storage technology among various alternatives is of great importance. In this work, the sustainability of typical energy storage technologies was studied with respect to four aspects for peak shaving scenarios, including technical (i.e. maturity, energy density, round-trip efficiency, duration ranges, life cycles, lifetime and position flexibility), economic (levelized cost of energy, net present value), environmental (i.e. global warming, damage to human health, damage to ecosystems, damage to resource availability) and social (public acceptance) based on the full life cycle. This study evaluated the soft criteria including maturity, position flexibility and public acceptance by Analytic hierarchy process (AHP). Life cycle assessment (LCA) and life cycle cost (LCC) methods were combined to study the life-cycle environmental and economic performance. Technique for order preference by similarity to an ideal solution (TOPSIS) was applied for determining the sustainability prioritization of energy storage technologies. The sensitivity analysis was carried out to investigate the effects of control and economic input parameters on environmental performance and economic performance. In addition, the effects of criteria weights, electricity sources and number of daily cycles were conducted on sustainability ranking of ESSs. The results showed Lithium iron phosphate battery (LIPB) and pumped hydro storage (PHS) had good sustainability performance, which could be the most suitable energy storage technologies for peak shaving scenarios. © (2023) by ECOS 2023 All rights reserved.

关键词： Life cycle

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Effect of Fuel System on the Heat Releasing Method and flow-Path Design of Rocket-Based Combined Cycle Engine 14

Effect of Fuel System on the Heat Releasing Method and Flow-...

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14th International Conference on Mechanical and Aerospace engineering, ICMAE 2023

作者： Liu, Xiao Wang, Yinhu Yang, Yiyan Shi, Lei Yan, Dekun Xi'An Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China Beijing Institute of Long March Vehicle Beijing China Northwestern Polytechnical University Science and Technology on Combustion Internal Flow and Thermal-structure Laboratory Xi'an China

ISBN: (纸本)9798350340327

Multi-components rocket-based combined cycle (RBCC) engine is widely applied in most two-stage-To-orbit program due to stable operation performance under variable flight conditions. Present researches numerically compared RBCC's performance under ramjet mode and scramjet mode, respectively, by using two fuel system, hydrogen and kerosene together with a \mathrm{k}-\omega SST turbulence model. Researches showed that the combustor area ratio should be increased to keep stable pressure difference balance between inflow and flame because of higher caloric value using hydrogen. Distributed heat addition method is benifit for overall performance improvement when using hydrogen. Different from using kerosene, head should be delayedly added in combustor downtream under scramjet mode. Moreover, the advanced heat addition amount should be decreased under ramjet mode to ensure effective isolator operation. © 2023 IEEE.

关键词： Hydrogen

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Numerical study of specific C-shaped heat exchanger using porous medium and coarse mesh coupling method

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International Journal of Thermal Sciences 2025年 210卷

作者： He, Shaopeng Wang, Shiqi Wang, Mingjun Tian, W.X. Qiu, S.Z. Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Porous medium method is an effective simplified approach for the heat exchanger simulation when the numerous tubes and complex structures bring unacceptable computational resources to full-scale simulation. However, for the specific C-shaped heat exchanger, the tube side resistance and flow distribution characteristics that significantly affects the heat transfer and natural circulation performance cannot be obtained by the traditional porous medium method coupled with the one-dimensional node model for tube side. It is urgent to develop a new coupling method that can not only simplify modeling and calculation, but also obtain tube side high-resolution flow heat transfer characteristics. This study presents a novel calculation method which couples the porous medium mesh and the tube side coarse mesh. The coupling method was then applied to a typical C-shaped passive residual heat removal heat exchanger (PRHR HX), which is significant to the stable operation and the mitigation of accident conditions in the nuclear power plant. The coupling calculation method was validated against the full-scaled simulation and data from scaled-down experiment. The average relative error of heat transfer power is 2.1 % under steady state conditions. Under transient conditions, the average absolute error of the fluid temperature and wall temperature are less than 6 K. Then the 3D thermal-hydraulic characteristics of PRHR HX was studied. Owing to a greater gravitational pressure head, the mass flow rates in the extended tubes surpass those in the shorter tubes by a relative deviation of 27.4 %. The upper horizontal tube's heat exchange capacity constitutes approximately 70 % of the total power, leading to enhanced natural circulation. The outlet temperatures from various tubes tend to equalize. The boiling area gradually extended down along the heat transfer tubes. Our work would present an innovative calculation method to the numerical study and design optimization of the C-shaped heat

关键词： Nuclear power plants

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Excellent Energy Storage Performance Achieved in Sr(Sc0.5Nb0.5)O3-Doped Bi0.5Na0.5TiO3-Based Lead-Free Relaxor Ferroelectric Ceramics

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ACS Applied Energy Materials 2024年第5期7卷 2030-2038页

作者： Liu, Jinnan Li, Da Zhao, Weichen Xu, Diming Shi, Zhongqi Liu, Wenfeng Su, Jinzhan Zhou, Tao Chen, Guohua Zhou, Di Electronic Materials Research Laboratory & Multifunctional Materials and Structures Key Laboratory of the Ministry of Education International Center for Dielectric Research School of Electronic Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Mechanical Behaviour of Materials Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Shaanxi Xi’an710049 China International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Electronic and Information Engineering Hangzhou Dianzi University Hangzhou310018 China Electronical Information Materials Devices Engineering Research Center of Ministry of Education Guangxi Key Laboratory of Information Materials School of Material Science and Engineering Guilin University of Electronic Technology Guilin541004 China

Dielectric energy storage ceramics have received significant attention as the primary component for high-pulse power capacitors. Currently, their development is limited by poor energy storage performance, which affects the miniaturization and lightweighting of electronic devices. In this study, a comprehensive optimization approach was adopted to enhance the storage performance (recoverable energy density Wrec and conversion efficiency η) of 0.8Bi0.5Na0.5TiO3-0.2NaNbO3 (BNT-NN) through component optimization design and repeated rolling process (RRP). A series of Sr(Sc0.5Nb0.5)O3 (SSN) was introduced into BNT-NN to modulate the phase structure and improve the relaxation properties. The repeated rolling process was applied to refine the grain and enhance the dense property to boost the breakdown of the electric field. Following the mentioned strategy, we have succeeded in simultaneously obtaining ultrahigh Wrec (∼7.22 J·cm-3) and outstanding η (∼95.32%) under 515 kV·cm-1 for 0.8(BNT-NN)-0.2SSN (RRP) ceramic. More importantly, the ceramic sample possesses outstanding stability over a wide range of temperatures (25-60 °C) and frequencies (1-100 Hz). This study proposes a viable route to better performance of dielectric ceramics for energy storage, and the outstanding performance of the 0.8(BNT-NN)-0.2SSN (RRP) ceramic indicates its promising applicability in high- and high-pulse-power electronic devices. © 2024 American Chemical Society.

关键词： Energy storage

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Thermal mechanical response analysis of the first wall in laser initial confinement fusion reactors

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International Journal of Advanced Nuclear Reactor Design and Technology 2025年第2期7卷 147-155页

作者： Xinze Li Bingqian Zhang Chengcheng Tong Ronghua Chen Dalin Zhang Wenxi Tian Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China

This paper investigates the thermo-mechanical response characteristics of the first wall of a laser initial confinement fusion reactor under periodic transient heat flux loads. The first wall of the reactor experiences extremely high instantaneous heat loads during the target compression process, leading to temperature and thermal stress oscillations, which can cause material fatigue damage. Finite element analysis is employed to model the first wall under various chamber sizes and target energies, and the thermal-mechanical response characteristics of W, W/Cu functional gradient materials, and blanket materials are studied under thermal shock and cyclic loading conditions. The results indicate that W/Cu functional gradient materials can effectively alleviate thermal stresses on the first wall, especially in addressing the stress concentration at the interface. Fatigue life of the first wall is assessed using the Basquin model, and it is found that increasing the chamber size and increasing the target frequency can significantly reduce temperature oscillations and thermal stresses, thus extending the service life of the first wall. This study provides valuable design references for the optimization and design of the first wall in laser initial confinement fusion reactor.

关键词： Laser inertial confinement fusion reactor First wall Heat oscillation Thermal fatigue

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