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Molecular dynamics simulation on de-icing behavior of nanodroplets on amorphous SiO2 非晶态二氧化硅上纳米液滴除冰行为的分子动力学模拟
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012015
Wenqi Fan, Chen Li
{"title":"Molecular dynamics simulation on de-icing behavior of nanodroplets on amorphous SiO2","authors":"Wenqi Fan, Chen Li","doi":"10.1088/1742-6596/2838/1/012015","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012015","url":null,"abstract":"The ice formation and detachment process of nanoscale water droplets on the amorphous SiO<sub>2</sub> substrate, which is for simulating the glass of solar panels, is studied in this paper by molecular dynamics simulation methods, considering the effects of environmental temperature, onset of icing time, and parameters of the nanoarray on the ice formation morphology and ice adhesion strength. The results show that the ice adhesion strength is independent of the environmental temperature. The time of icing onset influences the recoil state of droplets, with a larger spreading area leading to higher adhesion strength. The increase in height and decrease in width of the nanocolumns of nanoarray structure leads to an increase in the contact angle of the droplet, causing a reduction in ice adhesion strength, albeit with a slight rise within a certain height range.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical study of film cooling at the outlet of gas turbine exhaust 燃气轮机排气口薄膜冷却的数值研究
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012024
Longbing Hu, Yu Rao, Hua Zhang
{"title":"Numerical study of film cooling at the outlet of gas turbine exhaust","authors":"Longbing Hu, Yu Rao, Hua Zhang","doi":"10.1088/1742-6596/2838/1/012024","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012024","url":null,"abstract":"In order to mitigate the potential operational damage risk caused by traditional cooling methods in engineering applications of heavy-duty gas turbine component testing, the film cooling unit and realizable K-epsilon turbulence model were employed. Numerical simulations were conducted for multiple exhaust film holes with varying curvature and pitch-row under different operating conditions. The heat transfer distribution along the flow direction and radial direction of the high temperature wall was analyzed, as well as the influence of heat transfer under different geometrical parameters. The results indicate that for the integrated configuration of large-diameter cooling units, a blowing ratio of 0.3 yields the most comprehensive cooling effect, primarily due to the extensive spatial coverage by the gas film and the weakening of eddy dissipation mechanisms. Additionally, it was observed that with an increase in hole distance ratio for multiple exhaust film holes, cold air could more stably participate in heat exchange with high-temperature flue gas wake at the outlet of the gas film hole; thus, a hole distance ratio of 3.0 provides optimal comprehensive cooling effects.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of several typical plastic combustion residues on gasoline 几种典型塑料燃烧残留物对汽油的影响
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012014
Lili Yu, E Dazhi, Shujun Liu
{"title":"Effects of several typical plastic combustion residues on gasoline","authors":"Lili Yu, E Dazhi, Shujun Liu","doi":"10.1088/1742-6596/2838/1/012014","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012014","url":null,"abstract":"In order to solve the interference caused by polymer materials on gasoline accelerants in arson cases, the characteristics of residues after combustion of some typical plastics are studied. Comparing it to the combustion residue of gasoline, we discussed the interference in gasoline detection. The results show that the combustion products of these plastics mainly interfere with the alkanes and aromatic hydrocarbons in gasoline. Polyethylene, polystyrene, and polyvinyl chloride mainly produce C9-C16 branched-chain and straight-chain alkanes. Polystyrene and ABS resin generated C5 and C6 alkanes, also generated C1-benzene, C2 - benzene, and styrene. It mainly affects the identification of aromatic hydrocarbons in gasoline combustion residues. Understanding the types and characteristics of products in the combustion residues of these plastics can provide powerful evidence for fire investigators and criminal technicians in physical evidence identification.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Imine-based nickel/cobalt covalent organic framework with high rate and stability for supercapacitor 用于超级电容器的具有高速率和高稳定性的亚胺基镍/钴共价有机框架
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012025
Guanwen Wang, Chunlei Chi, Zheng Liu, Zhuangjun Fan
{"title":"Imine-based nickel/cobalt covalent organic framework with high rate and stability for supercapacitor","authors":"Guanwen Wang, Chunlei Chi, Zheng Liu, Zhuangjun Fan","doi":"10.1088/1742-6596/2838/1/012025","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012025","url":null,"abstract":"Due to their regular pore structure, long-range order, and structural stability, COFs (Covalent Organic Frameworks) have gradually been employed as electrode materials for supercapacitors. However, owing to their two-dimensional stacking structure, poor conductivity, and the lack of effective redox-active sites, they usually exhibit inferior rate performance and cycling stability. Therefore, we design an imine-based Ni<sub>0.7</sub>Co<sub>0.3</sub>-COF anchored with Ni/Co redox centres at the atomic level and adjust their proportion. This approach optimizes the electronic structure and enhances the electronic conductivity and redox activity of Ni<sub>0.7</sub>Co<sub>0.3</sub>-COF. Ni<sub>0.7</sub>Co<sub>0.3</sub>-COF are grown through thin-layered cross-linking, significantly shortening both the ion and electron transport pathways. This improves the contact area between electrolyte ions and electrode materials and enhances the utilization of redox centres, thereby substantially improving the rate performance (1300 F g<sup>−1</sup> at 50 A g<sup>−1</sup>) and cycling stability (72% retention after 5000 cycles) of Ni<sub>0.7</sub>Co<sub>0.3</sub>-COF.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High proportion of new energy power system frequency and voltage support and regulation technology based on doubly fed induction generator 基于双馈异步发电机的高比例新能源电力系统频率和电压支持与调节技术
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012033
Jian Zhang, Wenfeng Li, Zhichen Geng, Changhao Guo
{"title":"High proportion of new energy power system frequency and voltage support and regulation technology based on doubly fed induction generator","authors":"Jian Zhang, Wenfeng Li, Zhichen Geng, Changhao Guo","doi":"10.1088/1742-6596/2838/1/012033","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012033","url":null,"abstract":"With the increasing proportion of new energy in power systems, issues regarding system voltage, inertia, and primary frequency regulation have become increasingly severe. In response to control and grid safety issues, a high proportion of new energy power system frequency and voltage support and regulation technology based on a doubly fed induction generator (DFIG) is proposed. The voltage-magnetic link equation of DFIG is theoretically derived, and the control principles of active and reactive power of DFIG are proposed. The support and regulation characteristics of improving the voltage of new energy substations are studied. Verification is conducted through large-scale grid simulation and on-site measurements.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of the limitation factors of thick cathodes based on experimental and P2D model simulations 基于实验和 P2D 模型模拟的厚阴极限制因素分析
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012026
Bin Qi, Zhiyuan Li, Lei Song, Guanwen Wang, Tong Wei
{"title":"Analysis of the limitation factors of thick cathodes based on experimental and P2D model simulations","authors":"Bin Qi, Zhiyuan Li, Lei Song, Guanwen Wang, Tong Wei","doi":"10.1088/1742-6596/2838/1/012026","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012026","url":null,"abstract":"The thickness of the electrode significantly impacts battery performance. Increasing electrode thickness contributes to higher energy density, but it also leads to a decline in rate capability and stability. Therefore, a balance must be struck when determining electrode thickness. In this context, we compare experimental results with numerical simulations to reveal the primary reasons behind the drastic reduction in battery capacity and rate performance due to excessively thick electrodes. At the same time, there is minimal difference between experimental and simulated results at lower electrode thicknesses and smaller currents. As the electrode thickness and current increase, experimental performance deteriorates more rapidly, which arises from the uneven distribution of various components within the cathode during the drying process. In addition, we also simulated the capacity of the crack-free electrode and the depth of discharge at various locations within it, thus determining the main factors of its capacity decline.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance assessment of deep borehole heat exchanger heating system under different heating modes 不同加热模式下深孔热交换器加热系统的性能评估
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012036
Chao Zhu, Peng Shi, Tuo Zhang, Zhuang Li, Chen Quan, Feng Li, Qing Xia
{"title":"Performance assessment of deep borehole heat exchanger heating system under different heating modes","authors":"Chao Zhu, Peng Shi, Tuo Zhang, Zhuang Li, Chen Quan, Feng Li, Qing Xia","doi":"10.1088/1742-6596/2838/1/012036","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012036","url":null,"abstract":"With the transition towards renewable energy sources, particularly as we move away from fossil fuels, there has been a constant evolution of deep borehole heat exchanger (DBHE) coupled heat pump heating technology. On the basis of the heat-exchanging properties of circulating fluid in the DBHE heating system, this paper clarifies the setup forms of this system, and elucidates the influence of heat extraction performance. After analysis and research, it can be concluded that the direct supply mode shows a more prominent decline in water temperature compared to the coupled heat pump and coupled plate heat exchanger modes. The imported and exported water temperatures when heating ends were recorded as 9.98°C and 16°C, respectively. The imported and exported water temperatures for both the direct supply and the coupled plate heat exchanger modes tend to be similar at 19.6°C and 25.5°C at a temperature of 7°C. Heat pump not only enhances the heat exchange features of ground source heat pump (GSHP) heating system, but also defines the configuration of heat extraction performance of DBHE. The system power consumption in the coupled plate heat exchanger mode is lower than that in the heat pump mode which is conducive to stable operation. Therefore, the best design form of the DBHE Heating System is the heat pump coupled plate exchange mode.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Co-ZrO2 electrocatalyst achieves high-performance solid-state lithium-sulfur batteries 高效 Co-ZrO2 电催化剂实现高性能固态锂硫电池
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012030
Yanyan Ma, Jianhua Yan
{"title":"Efficient Co-ZrO2 electrocatalyst achieves high-performance solid-state lithium-sulfur batteries","authors":"Yanyan Ma, Jianhua Yan","doi":"10.1088/1742-6596/2838/1/012030","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012030","url":null,"abstract":"Li-S batteries are recognized as a promising secondary battery system because of their high energy density, low cost, and environmental friendliness. However, the development of Li-S batteries is mainly limited by issues such as electrode volume expansion, lithium polysulfide (LiPSs) shuttle, and slow redox reaction kinetics of sulfur. Here, a kind of solid-state Li-S battery with in situ solidified solid-state electrolytes (SSEs) is reported, which dramatically reduces the electrode/electrolyte interfacial impedance. In addition, electrospinning is used to fabricate a macroporous carbon nanofibers film (MP-CNFs) loaded with dispersed Co-ZrO<sub>2</sub> nanodot electrocatalyst as the cathode host. The in-situ gel electrolyte can be easily infiltrated into the porous carbon nanofibers and contact the Co-ZrO<sub>2</sub> catalyst, thus fully exerting its catalytic and conversion effects on LiPSs. The results indicate that solid-state Li-S batteries exhibit a high initial capacity of 795.5 mA h·g<sup>−1</sup> and a capacity retention rate of ∼100% after 200 cycles at 1 C.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Energy flow tracking of integrated energy system with electric thermal storage boiler 带有电蓄热锅炉的综合能源系统的能量流跟踪
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012029
Guangzhe Liang, Xiaoming Zhang, Chonglei Ding, Jiaoyang Feng
{"title":"Energy flow tracking of integrated energy system with electric thermal storage boiler","authors":"Guangzhe Liang, Xiaoming Zhang, Chonglei Ding, Jiaoyang Feng","doi":"10.1088/1742-6596/2838/1/012029","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012029","url":null,"abstract":"With the complexity and diversification of the integrated energy system, accurate optimization of resource allocation and scheduling has become the focus of research. This paper studies the energy flow tracking technology of the heat-electric integrated energy system with an electric thermal storage boiler. The modeling of the electric thermal storage boiler and the application of the energy flow tracking technology not only improves the flexibility and stability of the system but also realizes the comprehensive monitoring and analysis of the electric energy and heat energy flow in the system. Finally, the energy flow tracking technology is used to reveal the flow path and distribution of energy in the system through the example of the integrated energy system. It also shows the flexible energy and space-time transfer characteristics of the electric thermal storage boiler in the electrothermal integrated energy system.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical integrity analysis of caprock during the CO2 injection phase 二氧化碳注入阶段的盖岩机械完整性分析
Journal of Physics: Conference Series Pub Date : 2024-09-01 DOI: 10.1088/1742-6596/2838/1/012016
Bin Liu, Tiantian Huang
{"title":"Mechanical integrity analysis of caprock during the CO2 injection phase","authors":"Bin Liu, Tiantian Huang","doi":"10.1088/1742-6596/2838/1/012016","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012016","url":null,"abstract":"CO<sub>2</sub> geological storage is one of the important means to mitigate the greenhouse effect. The safe underground storage of CO<sub>2</sub> largely depends on the mechanical integrity of the caprock. This paper establishes a fluid-solid coupling model for CO<sub>2</sub> geological storage to study the changes in pore pressure, vertical displacement, and effective stress in the caprock during the CO<sub>2</sub> injection process. Combined with the Mohr-Coulomb criterion, the study determines whether mechanical failure occurs in the caprock. The results indicate that, at the beginning of CO<sub>2</sub> injection, significant changes occur in the pore pressure, vertical displacement, and effective stress at the bottom of the caprock near the injection well, which then tend to stabilize; the maximum pore pressure at the bottom of the caprock reaches 36.08 MPa; the caprock near the injection well is considered the most critical area, where the risk of mechanical failure is highest; at the end of CO<sub>2</sub> injection, the stress state does not reach the limit, and the caprock remains stable.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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