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学者姓名：李加庆
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Abstract ：
Understanding plastic deformation behaviour is key to optimising the mechanical properties of nano-polycrystalline layered composites. This study employs the molecular dynamics (MD) simulation to comprehensively investigate the effects of various factors, such as grain sizes, strain rates, and the interlayer thicknesses of the intermetallic compounds (IMCs), on the plastic deformation behaviour of nano-polycrystalline Al/Mg layered composites. Our findings reveal that the influence of grain size on deformation behaviour is governed by the strain rate, and an increase in grain size is inversely proportional to yield stress at low strain rates, whereas it is positively proportional to tensile stress at high strain rates. Moreover, an optimal thickness of the intermediate layer contributes to enhanced composite strength, whereas an excessive thickness leads to reduced tensile strength due to the fewer grain boundaries (GBs) available for accommodating dislocations. The reinforcing impact of the intermediate IMCs layer diminishes at excessive strain rates, as the grains struggle to accommodate substantial large strains within a limited timeframe encountered at high strain rates. The insights into grain sizes, strain rates, and interlayer thicknesses obtained from this study enable the tailored development of nanocomposites with optimal mechanical characteristics.
Keyword ：
Al/Mg layered composites Al/Mg layered composites intermetallic compounds intermetallic compounds molecular dynamics simulation molecular dynamics simulation plastic deformation mechanism plastic deformation mechanism
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| GB/T 7714 | Li, Zhou , Shen, Tong , Hu, Xiao et al. The Plastic Deformation Mechanism in Nano-Polycrystalline Al/Mg Layered Composites: A Molecular Dynamics Study [J]. | NANOMATERIALS , 2024 , 14 (1) . |
| MLA | Li, Zhou et al. "The Plastic Deformation Mechanism in Nano-Polycrystalline Al/Mg Layered Composites: A Molecular Dynamics Study" . | NANOMATERIALS 14 . 1 (2024) . |
| APA | Li, Zhou , Shen, Tong , Hu, Xiao , Zhang, Lu , Jia, Xianshi , Li, Jiaqing et al. The Plastic Deformation Mechanism in Nano-Polycrystalline Al/Mg Layered Composites: A Molecular Dynamics Study . | NANOMATERIALS , 2024 , 14 (1) . |
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Excessive electric field strength causes the droplets to contact but not coalesce, severely deteriorating the oil-water separation efficiency. The investigation of the non-coalescence of nonidentical droplets in oil under a DC electric field is conducted using high-speed photography. The effects of droplet volume ratio and interfacial tension ratio on the characteristics and critical parameters for droplet non-coalescence are systematically explored. The results show the critical electrocapillary number for the non-coalescence of nonidentical droplets and critical contact cone angle decreases as the volume sum increases or the interfacial tension ratio decreases, which is related to the competition between the resultant electric field force and the interfacial tension force. These results contribute to optimizing the operating parameters of the electric coalescer and improving the oil-water separation efficiency.
Keyword ：
capillary pressure difference capillary pressure difference droplet droplet electric field electric field liquid bridge liquid bridge nonidentical non-coalescence nonidentical non-coalescence
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| GB/T 7714 | Huang, Xin , Chen, Mindan , Huang, Yunyun et al. Non-coalescence of nonidentical droplets in oil under a DC electric field [J]. | AICHE JOURNAL , 2024 , 70 (8) . |
| MLA | Huang, Xin et al. "Non-coalescence of nonidentical droplets in oil under a DC electric field" . | AICHE JOURNAL 70 . 8 (2024) . |
| APA | Huang, Xin , Chen, Mindan , Huang, Yunyun , Luo, Xiaoming , Teng, Lin , Xiao, Longqiang et al. Non-coalescence of nonidentical droplets in oil under a DC electric field . | AICHE JOURNAL , 2024 , 70 (8) . |
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【目的】绿氨作为氢能的优质载体，生产工艺无碳化的优势使其成为实现碳中和目标的备选能源之一，因此绿氨终端站的布局与建设对促进氢能产业链的快速发展具有重要作用，有利于推动社会能源结构的绿色转型。【方法】概述了氨的性质：氨作为高效的储能与储氢介质，具有高能量密度、易储运、终端站无碳排放、安全性高等特点，能够显著降低储氢、运氢、用氢的成本，并可提高能源安全性。分析了氨用于储氢与储能介质具有的能量密度高、安全、长时储能等优势，调研了全球多国的氨氢项目发展与贸易情况，论述了全球快速增长的绿氨产能及需求，总结了目前氨能的贸易现状与终端站建设情况；对比目前成熟的LNG接收站相关工艺技术，详细介绍了绿氨终端站的关键工艺及技术，包括终端站绿氨存储工艺系统、液氨蒸发气处理工艺系统、终端站加注及卸载工艺系统。【结果】提出绿氨终端站的安全性问题，深入剖析了终端站液氨泄漏导致的毒性、燃烧爆炸性等危害，并给出了预防及防护措施。【结论】从化肥行业到能源领域，绿氨终端站技术的研究与发展对促进绿色能源氢能的利用具有重要意义，未来绿氨终端站的数量与规模将持续增加以适应新时代的需求，同时可以考虑改造LNG接收站等大宗能源及化工品储运设施以降低成本。（图5，表3，参59）
Keyword ：
储氢载体 储氢载体 接收工艺 接收工艺 接收终端 接收终端 液氨泄漏 液氨泄漏 碳中和 碳中和 绿氢 绿氢 绿氨 绿氨 绿色能源 绿色能源
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| GB/T 7714 | 滕霖 , 林崴 , 尹鹏博 et al. 碳中和目标下绿氨终端站储运技术发展现状及趋势 [J]. | 油气储运 , 2024 , 43 (01) : 1-11 . |
| MLA | 滕霖 et al. "碳中和目标下绿氨终端站储运技术发展现状及趋势" . | 油气储运 43 . 01 (2024) : 1-11 . |
| APA | 滕霖 , 林崴 , 尹鹏博 , 李卫东 , 黄鑫 , 李加庆 et al. 碳中和目标下绿氨终端站储运技术发展现状及趋势 . | 油气储运 , 2024 , 43 (01) , 1-11 . |
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【目的】在“双碳”背景下，氨作为无碳富氢的能源载体，体积能量密度高、易液化存储，具有广阔的发展前景。然而复杂的储运环境增加了液氨储罐和管道腐蚀的风险，因此，研究复杂输送环境下液氨腐蚀问题是“氨-氢”能源基础设施制造和安全服役的关键。【方法】通过综述液氨腐蚀的研究进展，探讨了不同环境、不同材料的氨腐蚀行为和应力腐蚀开裂机制。同时，总结了相关氨腐蚀检测方法和具体防护措施，并展望了未来氨腐蚀研究的发展方向。【结果】氧气、碳氧化合物、硫化物及氯化物的混入对氨腐蚀有促进作用，而水杂质对氨腐蚀的影响具有两面性；应力能够引起液氨应力腐蚀开裂，不同材料的应力腐蚀敏感性从大到小依次为铜及其合金、高强钢、碳钢。【结论】基于国内对液氨腐蚀行为机理尚不明确、氨腐蚀防护措施有待完善等问题，提出以下建议：(1)采用实验研究、仿真模拟等方法，探究多杂质关联作用下不同材质的液氨腐蚀行为和内在腐蚀机理；(2)需结合液氨管道实际输送环境及材料失效特征，开展管线钢及焊材-液氨临界失效边界检验与腐蚀风险评价；(3)从液氨储罐及管道的设计、选材、制造、使用等多个角度，结合多种腐蚀防腐措施，形成完善的液氨储运系统腐蚀控制、防护及评价标准体系。（图5，表2，参77）
Keyword ：
应力腐蚀 应力腐蚀 液氨储运 液氨储运 环境腐蚀 环境腐蚀 腐蚀检测 腐蚀检测 防护技术 防护技术
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| GB/T 7714 | 李加庆 , 冯智雨 , 梁辉龙 et al. 复杂输送环境下液氨腐蚀行为及防护技术研究进展 [J]. | 油气储运 , 2024 , 43 (02) : 121-133,162 . |
| MLA | 李加庆 et al. "复杂输送环境下液氨腐蚀行为及防护技术研究进展" . | 油气储运 43 . 02 (2024) : 121-133,162 . |
| APA | 李加庆 , 冯智雨 , 梁辉龙 , 尹鹏博 , 滕霖 , 陈崇启 et al. 复杂输送环境下液氨腐蚀行为及防护技术研究进展 . | 油气储运 , 2024 , 43 (02) , 121-133,162 . |
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采用成品油管道顺序输送甲醇不仅可以拓展甲醇运输方式、降低运输成本，还能够提升管道运力、缓解现有成品油管道低输量难题，但目前成品油管道顺序输送甲醇工艺相关研究鲜有报道，技术的推广和应用受限。针对顺序输送过程中的混油问题，结合ALE(Arbitrary LagrangianEulerian)方法、流体控制方程以及物质传递方程，建立了甲醇和汽油顺序输送混油模型，分析了输送次序和管道流速对甲醇和汽油顺序输送过程中混油长度和混油浓度演化的影响规律。研究表明，该模型模拟的混油长度略短于VOF（流体体积）方法，在实际顺序输送过程中选择甲醇前行汽油后行的输送次序，能够有效缩短混油长度。研究结论可为成品油管道顺序输送甲醇工艺提供理论指导。
Keyword ：
ALE方法 ALE方法 数值模拟 数值模拟 混油扩散 混油扩散 甲醇输送 甲醇输送
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| GB/T 7714 | 黄鑫 , 施鸿翔 , 王良旭 et al. 水平管道中甲醇和汽油顺序输送过程混油规律研究 [J]. | 油气与新能源 , 2024 , 36 (04) : 57-66 . |
| MLA | 黄鑫 et al. "水平管道中甲醇和汽油顺序输送过程混油规律研究" . | 油气与新能源 36 . 04 (2024) : 57-66 . |
| APA | 黄鑫 , 施鸿翔 , 王良旭 , 李卫东 , 李加庆 , 尹鹏博 et al. 水平管道中甲醇和汽油顺序输送过程混油规律研究 . | 油气与新能源 , 2024 , 36 (04) , 57-66 . |
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The droplet dynamic model under an electric field is established in this paper by coupling electric equations, multiphase flow equations, and isoAdvector interface capture method, accurately predicting the deformation and rupture characteristics of multiple emulsion droplets affected by an electric field. The evolutions of the flow field and electric field during the deformation and breakup processes of multiple emulsion droplets subjected to an electric field are elucidated and the effects of the electric capillary number Ca and the radius ratio R* of the inner and outer droplets on the characteristics of droplet deformation and rupture are analyzed. The results show that in the silicone oil/water emulsion system, the inner droplet is difficult to induce charge since the electrostatic shielding effect of the outer droplet, and it has no impact on the equilibrium deformation of the outer droplet; whereas in the castor oil/silicone oil emulsion system, the charge is induced on the interfaces of both the internal and external droplets and the internal droplet has a remarkable impact on the equilibrium deformation of the external droplet. Furthermore, deformation-breakup phase diagrams of multiple emulsion droplets exposed to the electric field are obtained. As R* increases, the Cac for droplet breakup decreases, indicating that the internal droplet intensifies the breakup of the external droplet. The results are significant for the promotion and application of electric field-driven droplet manipulation technology.
Keyword ：
Breakup Breakup Deformation Deformation Electric field Electric field isoAdvector isoAdvector Multiple emulsion Multiple emulsion
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| GB/T 7714 | Huang, Xin , Lu, Yijia , Li, Yilong et al. The isoAdvector method for simulating deformation and breakup of multiple emulsion droplets responding to a DC electric field [J]. | JOURNAL OF ELECTROSTATICS , 2024 , 129 . |
| MLA | Huang, Xin et al. "The isoAdvector method for simulating deformation and breakup of multiple emulsion droplets responding to a DC electric field" . | JOURNAL OF ELECTROSTATICS 129 (2024) . |
| APA | Huang, Xin , Lu, Yijia , Li, Yilong , Luo, Xiaoming , Teng, Lin , Li, Weidong et al. The isoAdvector method for simulating deformation and breakup of multiple emulsion droplets responding to a DC electric field . | JOURNAL OF ELECTROSTATICS , 2024 , 129 . |
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The evaporation characteristics of a sessile droplet under a direct current electric field were numerically investigated, and a numerical model was developed based on the arbitrary Lagrange-Euler method, combining the flow, heat transfer, vapour transport, and electrostatic equations. The simulations were validated to be in good agreement with previously reported experiments. The results demonstrate that the electric field can enhance the evaporation of the sessile droplet with different evaporative cooling numbers (initial electric field intensity E0 = 280 kV & sdot;m 1; 32.9% decrease in the evaporation time for water) by the following three methods: increasing the surface area of the droplet evaporation (2.6%) through the electric-field-induced deformation, improving the heat transfer efficiency between the droplet and substrate (droplet average temperature increases by 2.3 K) through the internal vortex, and by enhancing the shearing effect on the vapour layer (450.3% increase in vapour diffusion distance dc) through the external vortex. Additionally, the evaporation of a sessile water droplet undergoing thermocapillary convection is further enhanced under the electric field (E0 = 280 kV & sdot;m 1; 20.0% decrease in the evaporation time). As the inhomogeneous temperature distribution inside the droplet was eliminated by thermocapillary convection, the evaporation efficiency was dominated by the increased surface area of the droplet evaporation and the enhanced shearing effect on the vapour layer. These results will provide a better understanding of the electro-hydrodynamic enhanced droplet evaporation.
Keyword ：
ALE ALE Droplet deformation Droplet deformation Droplet evaporation Droplet evaporation Electric field Electric field Numerical simulation Numerical simulation
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| GB/T 7714 | Wang, Weifeng , Huang, Xin , Wang, Liangxu et al. Study on the mechanism of sessile droplets evaporation enhanced by the electric field [J]. | CHEMICAL ENGINEERING SCIENCE , 2024 , 288 . |
| MLA | Wang, Weifeng et al. "Study on the mechanism of sessile droplets evaporation enhanced by the electric field" . | CHEMICAL ENGINEERING SCIENCE 288 (2024) . |
| APA | Wang, Weifeng , Huang, Xin , Wang, Liangxu , Teng, Lin , Luo, Xiaoming , Li, Weidong et al. Study on the mechanism of sessile droplets evaporation enhanced by the electric field . | CHEMICAL ENGINEERING SCIENCE , 2024 , 288 . |
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液氨物性参数受自身体积膨胀性和温度敏感性影响较大，管道输送过程中液氨易汽化并产生气阻现象。为探究液氨管道水力热力特性发展规律，参考中国现有液氨管道设计运行参数，在修正液氨物性参数的基础上建立液氨长输管道仿真模型，模拟分析管径、环境温度、出口压力、入口温度、输量及土壤介质对液氨管道水力热力特性的影响。结果表明：随着管径增大，管道全线压力下降趋势逐渐平缓，当环境温度低于投氨温度时，适当增大管径能够有效避免液氨相特性的大幅改变；在综合考虑管道承压和液氨膨胀性的基础上，适当提高管道压力能够有效降低液氨汽化风险；在低输量工况下，提高输量对液氨管道全线压降影响较小、对温降影响较大，在高输量工况下结论则正好相反。研究成果可为液氨长输管道的设计和安全稳定运行提供参考。（图8，表4，参21）
Keyword ：
影响因素 影响因素 数值模拟 数值模拟 水力特性 水力特性 液氨管道 液氨管道 热力特性 热力特性
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| GB/T 7714 | 滕霖 , 林嘉豪 , 尹鹏博 et al. 液氨管道水力热力特性影响因素数值模拟 [J]. | 油气储运 , 2023 , 42 (03) : 283-290 . |
| MLA | 滕霖 et al. "液氨管道水力热力特性影响因素数值模拟" . | 油气储运 42 . 03 (2023) : 283-290 . |
| APA | 滕霖 , 林嘉豪 , 尹鹏博 , 李卫东 , 黄鑫 , 李加庆 et al. 液氨管道水力热力特性影响因素数值模拟 . | 油气储运 , 2023 , 42 (03) , 283-290 . |
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This study explores the phenomenon of slip transmission across grain boundaries in coarse-grained copper. The associated effects on the deformation gradient are also investigated, using both experiment and simulation. An in-situ tensile test of a fully annealed copper specimen was conducted first using a scanning electron microscope (SEM). The deformation gradient and geometrically necessary dislocation (GND) maps at selected tensile strain values were obtained and characterized by electron backscatter diffraction (EBSD). In addition, a physically based strain gradient crystal plasticity finite element method model has been developed to simulate the early stage of tensile deformation behaviour of copper. In this model, slip transmission across the grain boundary is either allowed or blocked, depending on the alignment of adjacent grains. Slip transmission is allowed at grain boundaries between suitably aligned grains according to the Luster-Morris factor, residual Burgers vector is applied to consider the slip misalignment at GB region, and dislocation accumulation at grain boundaries is included following the Kocks-Mecking law. It was found that dislocation pile-up, lattice rotation and stress concentration were much higher near the impenetrable grain boundaries than at the penetrable ones. Due to the slip transmissions across grain boundaries, the stress and strain concentrations can be partially relaxed, and the slip transmission induced relaxation is associated with the number of active slip systems and shear strain on the best aligned slip systems. This study provides an effective strategy to investigate the early stage of plastic deformation, and a good agreement between experimental observations and simulation results has been achieved.
Keyword ：
Copper polycrystals Copper polycrystals Deformation heterogeneity Deformation heterogeneity Finite element simulation Finite element simulation Grain boundary Grain boundary Slip transmission Slip transmission Strain gradient crystal plasticity Strain gradient crystal plasticity
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| GB/T 7714 | Wang, Rui , Lu, Cheng , Zhang, Che et al. An investigation of slip transmission during uniaxial tensile deformation of a coarse-grained copper via EBSD characterization and crystal plasticity modelling [J]. | COMPUTATIONAL MATERIALS SCIENCE , 2023 , 226 . |
| MLA | Wang, Rui et al. "An investigation of slip transmission during uniaxial tensile deformation of a coarse-grained copper via EBSD characterization and crystal plasticity modelling" . | COMPUTATIONAL MATERIALS SCIENCE 226 (2023) . |
| APA | Wang, Rui , Lu, Cheng , Zhang, Che , Godbole, Ajit , Davis, Bradley , Li, Jiaqing et al. An investigation of slip transmission during uniaxial tensile deformation of a coarse-grained copper via EBSD characterization and crystal plasticity modelling . | COMPUTATIONAL MATERIALS SCIENCE , 2023 , 226 . |
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This study presents surfactant injection as a replacement technology for mechanical pigging to reduce liquid accumulation for wet gas transmission. The hilly terrain gas/liquid flow development characteris-tics under surfactant injection were explored in pipelines, and a comprehensive experiment was per-formed through flow observation and the measurement and analysis of the flow characteristic parameters. The 250 ppm sodium dodecyl sulfate (SDS) surfactant was employed according to the vari-ation characteristics of the flow pattern and pressure drop at different concentrations. Flow observations and liquid holdup characteristics indicate that owing to the formation of aqueous foam, the gas/liquid interface and phase characteristics change significantly, and the liquid holdup decreases by several or even more than ten times and maintains a low value (0.004-0.070), except for the initial gas-liquid flow at low gas flow and high liquid flow rates. The aqueous foam effectively suppresses the slug and pseudo slug initiation, the gas/liquid convection of the slug body, and the large wave rolling of the pseudo-slug body, which induces the dissipation of intermittent flow. The pressure drop under the influence of aque-ous foam decreases drastically (60% ti 85%) at certain gas and liquid velocities and fluctuates smoothly near zero over a wide experimental range. The surfactant suppression on partially blocked pseudo-slug body induces a significant decrease of pseudo-slug frequency from 0.17 ti 0.42 Hz to 0 ti 0.06 Hz and transitional velocity from 1.21 ti 1.90 m/s to 0 ti 1.11 m/s. This research is highly significant for surfactant injection schemes and efficient and sustainable production.(c) 2023 Elsevier Ltd. All rights reserved.
Keyword ：
Aqueous foam Aqueous foam Flow visualization Flow visualization Gas-liquid flow Gas-liquid flow Hilly-terrain pipe Hilly-terrain pipe Pressure drop Pressure drop Surfactant Surfactant
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| GB/T 7714 | Yin, Pengbo , Huang, Xin , Li, Jiaqing et al. Influence of aqueous foam on gas-liquid flow development of hilly- terrain wet gas pipeline with surfactant injection [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 269 . |
| MLA | Yin, Pengbo et al. "Influence of aqueous foam on gas-liquid flow development of hilly- terrain wet gas pipeline with surfactant injection" . | CHEMICAL ENGINEERING SCIENCE 269 (2023) . |
| APA | Yin, Pengbo , Huang, Xin , Li, Jiaqing , Li, Weidong , Cao, Xuewen , Bian, Jiang et al. Influence of aqueous foam on gas-liquid flow development of hilly- terrain wet gas pipeline with surfactant injection . | CHEMICAL ENGINEERING SCIENCE , 2023 , 269 . |
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