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Hydrodynamic Pattern in Drying Saline Droplet with Suspended Nanoparticles

Journal of Bionic engineering 2020年第4期17卷 802-808页

作者： Junheng Ren Xin Zhong Lu Shen Fei Duan School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Evaporation of multicomponent droplets has gained much attention nowadays because of their complex flow fields and various deposition *** we observe strong flows in evaporating sodium chloride saline droplets with suspended alumina oxide *** evolution of flow pattern was studied by tracking the trajectories of particles and the velocity field was investigated with Particle Image Velocimetry *** non-uniform evaporation rate along the droplet surface leads to a concentration gradient which induces the convection *** the evaporation process before crystallization happens,evolution of the flow can be divided into two *** Regime I,a centrosymmetric convection recirculation is formed *** RegimeⅡ,the convection recirculation migrates to the droplet edge and evolves into several small *** the late evaporation stage,crystallization could induce strong convection *** is shown that the flow tends to become more chaotic with a lower salt concentration.

关键词： convection flow concentration gradient saline droplet crystallization

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Effect of Tungsten Size on Thermal Analysis and Mechanism of Lithium Perchlorate-Based Electrically Controlled Solid Propellant

SSRN

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SSRN 2023年

作者： Yang, Meng Yoh, Jack J. Tang, Chenglong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Department of Aerospace Engineering Seoul National University Seoul08826 Korea Republic of

Electrically controlled solid propellant (ECSP) is a novel and potential of propellant with excellent properties, which can achieve multiple ignitions and extinguishments through supplying and cutting electric power. At present, thermochemistry coupled with electrochemical reaction processes are complex and not understood clearly, especially its based thermal decomposition mechanism without electric power. In this work, the baseline ECSP was prepared using lithium perchlorate (LiClO4, LP) as oxidant, and tungsten as metal additive to obtain high energy ECSP samples. The scanning electron microscope (SEM), differential scanning calorimeter (DSC) and thermogravimetry (TGA) were used to investigate thermal analysis characteristics of ECSP and the effect of metal tungsten sizes on reaction process and mechanism. The heat release and effective activation energy (Eα) of baseline ECSP were lower than those of metalized ECSP. In addition, with W size increasing, heat release and Eα of ECSP increase. Based on thermal analysis and kinetic results, the decomposition mechanisms of ECSP main components and samples were proposed. The absorbed and crystal water evaporated, then main components molten for all cases at low temperature ( © 2023, The Authors. All rights reserved.

关键词： Thermogravimetric analysis

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Bacterial Cellulose Composite Solid Polymer Electrolyte With High Tensile Strength and Lithium Dendrite Inhibition for Long Life Battery

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Energy & Environmental Materials 2021年第3期4卷 434-443页

作者： Yuhan Li Zongjie Sun Dongyu Liu Shiyao Lu Fei Li Guoxin Gao Min Zhu Mingtao Li Yanfeng Zhang Huaitian Bu Zhiyu Jia Shujiang Ding Department of Applied Chemistry School of ChemistryXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials and Nanotechnology SINTEF IndustryForskningsveien 1Oslo 0373Norway School of Chemistry and Chemical Engineering MOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

The development of metallic lithium anode is restrained by lithium dendrite growth during *** solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite *** prepare the high-performance solid polymer electrolyte,the environment-friendly and cheap bacterial cellulose(BC)is used as filler incorporating with PEO-based electrolyte owing to good mechanical properties and Li salts ***/Li TFSI/BC composite solid polymer electrolytes(CSPE)are prepared easily by aqueous mixing in *** lithium ion transference number of PEO/Li TFSI/BC CSPE is 0.57,which is higher than PEO/Li TFSI solid polymer electrolyte(SPE)(0.409).The PEO/Li TFSI/BC CSPE exhibits larger tensile strength(4.43 MPa)than PEO/Li TFSI SPE(1.34 MPa).The electrochemical window of composite electrolyte is widened 1.43 V by adding *** functional theory calculations indicate that flex of PEO chains around Li atoms is suppressed,suggesting the enhanced lithium ion *** molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite *** solid-state Li metal battery with PEO/Li TFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/Li TFSI SPE battery(50 cycles).Li symmetrical battery using PEO/Li TFSI/BC CSPE could be stable for 1160 h.

关键词： all solid-state battery bacterial cellulose composite polymer electrolyte DFT calculations HOMO and LUMO

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Research on Artificial Neural Network for Geometric Design and Optimization of Three-Stage Segmented Thermoelectric Generators

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SSRN 2024年

作者： Zhang, Yin Guo, Kailun Wang, Chenglong Zhang, Jing Wang, Yulu Tian, Wenxi Su, Guanghui 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 School of Mechatronic Engineering Xianyang Vocational Technical College Xi’an712000 China

More green and environmentally friendly electricity production is the driving force for the development of thermoelectric generators. In addition to high-performance thermoelectric materials, optimizing the geometric shape of thermoelectric generators can also maximize thermoelectric efficiency. This work applies artificial neural networks to the design and optimization of a three-stage segmented thermoelectric generator. After verifying the thermoelectric numerical model of COMSOL, this work generated 3000 sets of simulation data for neural network training. After hyperparameter and particle swarm optimization, the trained neural network can exhibit extremely high prediction accuracy. By coupling the genetic algorithm and artificial fish swarm algorithm, the trained artificial neural network can optimize eight geometric parameters of a three-stage segmented thermoelectric generator under different temperature differences. Compared with COMSOL optimization results, the conversion efficiency optimized by GA has increased by 1.42% and 2.48% in cases 1 and 2, respectively;The conversion efficiency optimized by AFSA has increased by 3.61% and 2.86% in cases 1 and 2, respectively. By obtaining almost identical optimization values, the neural network can achieve geometric design optimization within 5 minutes under different temperature differences. This method provides a new and economical avenue for rapid prediction and design of thermoelectric generators. © 2024, The Authors. All rights reserved.

关键词： Genetic algorithms

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A simple analytical model to predict liquid unloading in the horizontal gas well

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Journal of Hydrodynamics 2021年第5期33卷 1056-1064页

作者： Zhi-bin Wang Jin-quan Ling Tian-li Sun Hong-yan Shi Guo Zhu 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 No 2 Gas Production PlantSouthwest Oil and Gas CompanySINOPECLangzhong 637400China Infrastructure Department Southwest Oil and Gas CompanySINOPECChengdu 610041China

An accurate prediction of the critical gas velocity for the liquid loading is of great importance for operators to select the tubing diameter for the newly drilled gas wells,or to optimize the production rate for production *** is clear from previous experimental studies of the liquid entrainment rate in the gas core that the liquid is mainly carried in the form of film under the critical condition of the liquid loading *** is more reasonable to establish a mathematical model based on the film reversal rather than based on the droplet *** our previous paper entitled“Prediction of the critical gas velocity of liquid unloading in the horizontal gas well”,a new analytical model was established based on the force balance between the gas-liquid interfacial friction force and the bottom film gravity,but the model is not very convenient to use because of the complexity of calculating the average film *** the present study,a new method is proposed to calculate the average film thickness from the bubble drift velocity in the mixture,so the new analytical model becomes much easier to *** new analytical model is evaluated against 103 sets of experimental data,the data in 124 vertical gas wells and one horizontal gas ***,the effect ofthe liquid loading on the production of the horizontal gas well is also analyzed.

关键词： Horizontal gas well inclined annular flow liquid-film thickness liquid unloading

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The blow-off and transient characteristics of co-firing ammonia/methane fuels in a swirl combustor 38th

The blow-off and transient characteristics of co-firing ammo...

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38th International Symposium on Combustion, 2021

作者： Zhang, Meng Wei, Xutao Wang, Jinhua Huang, Zuohua Tan, Houzhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

Recent studies have demonstrated that ammonia could be one of the most promising hydrogen carrier candidates which can be used in large-scale power plants. However, it is challenging to burn ammonia in gas turbines due to its narrow flame stabilization limits. In this study, the blow-off characteristics and flame macrostructure transition behavior of ammonia/air flame (NH₃ flame) and ammonia/methane/air flame (50%NH₃ flame) in a swirl combustor were investigated. Flame structures and flow fields near the blow-off limit were analyzed. Methane/air flame (CH₄ flame) was also examined for comparative purposes. The flow field and instantaneous OH profile were measured with PIV and OH-PLIF technique, respectively. Large eddy simulation (LES) was conducted to extend the understanding of the experimental findings. Results revealed that the NH₃ flame possesses a poor lean flame stability limit which can be largely extended by adding CH₄ in the fuel. Changing swirl number (S) had no apparent effect on the lean blow-off limit (Φ_b) for the NH₃ flame. On the contrary, a clear extension on Φ_b was found for the 50%NH₃ flame when increasing S. Four flame macrostructure modes were identified when decreasing equivalence ratio (Φ). The transition from flame II to flame III ((Φ_tdescribes the transition equivalence ratio) can be considered as the early warning of blow-off for a swirl stabilized flame. For the NH₃ flame, there was no clear flame macrostructure transition at small inlet velocities (U < 3.8 m/sec), i.e., Φ_b ≈ Φt. The difference between Φ_b and (Φ_twas observed as the inlet velocity increased. However, for the 50%NH₃ and CH₄ flames, a clear flame macrostructure transition from flame II to flame III was observed even for a lower inlet velocity. The LES results demonstrated that the NH₃ flame h

关键词： Ammonia

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Non-Hermitian Delocalization in a Two-Dimensional Photonic Quasicrystal

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Physical Review Letters 2024年第26期132卷 263801-263801页

作者： Zhaoyang Zhang Shun Liang Ismaël Septembre Jiawei Yu Yongping Huang Maochang Liu Yanpeng Zhang Min Xiao Guillaume Malpuech Dmitry Solnyshkov Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Faculty of Electronics and Information PHOTON-N2 Université Clermont Auvergne CNRS Clermont INP F-63000 Clermont-Ferrand France International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in Power Engineering Department of Physics National Laboratory of Solid State Microstructures and School of Physics 75231 Paris France

Theoretical and experimental studies suggest that both Hermitian and non-Hermitian quasicrystals show localization due to the fractal spectrum and to the transition to diffusive bands via exceptional points, respectively. Here, we present an experimental study of a dodecagonal photonic quasicrystal based on electromagnetically induced transparency in a Rb vapor cell. First, we observe the suppression of the wave packet expansion in the Hermitian case. We then discover a new regime, where increasing the non-Hermiticity leads to delocalization, demonstrating that the behavior in non-Hermitian quasicrystals is richer than previously thought.

关键词： Electromagnetically induced transparency Localization Photonics Non-Hermitian systems Quasicrystals

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Effect of Chemical Composition on Adsorption and Agglomeration Characteristics of Ash Particles After Sulfuric Acid Adsorption 9th

Effect of Chemical Composition on Adsorption and Agglomerati...

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9th International Symposium on Coal Combustion, ISCC 2019

作者： Jiang, Jiahao Yan, Yu Guo, Jin Li, Yuesheng Deng, Lei Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China Guangdong Institue of Special Equipment Inspection and Research Foshan528251 China Guangdong Institue of Special Equipment Inspection and Research Shunde Institue of Inspection Foshan528300 China

ISBN: (纸本)9789811616563

The low-low temperature electrostatic precipitator has been applied to enhance the efficiency of power plants. In this paper, the influences of chemical constitutions on the adsorption properties of particulate matters with vitriolic acid and the agglomeration after adsorption are researched. Experiments are conducted on a one-dimensional adsorption system, which simulates the working environment of low-low-temperature electrostatic precipitator. The consequences display that the agglomeration between particulate matters in scanning electron microscopy are loose pellets agglomeration together, adhesion of loose pellets to massive particles, and massive particles agglomeration together. For Na and K, the amounts of elements added have little effect on the adsorption of the sulfuric acid by ash particles. For Mg, Fe, and Ca, when the oxide is used as an additive, the adsorption capacity of ash samples to the vitriolic acid was enhanced and the agglomeration phenomenon of the ash granules was more remarkable with increasing elements amounts. In addition, the change of Mg has great impact on vitriolic acid adsorption and granules agglomeration. © 2022, Tsinghua University Press.

关键词： Adsorption

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A large-scale power-to-H 2 -to-power system adopting hydrogen mixed gas turbine for wind accommodation: Process modeling, optimal dispatch and economic feasibility analysis

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International Journal of Hydrogen Energy 2025年 145卷 345-357页

作者： Yanxin Li Xiaoqu Han Yiming Zhang Nikolaos Skordoulias Xuanhua Guo Junjie Yan Sotirios Karellas Emmanuel Kakaras State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Laboratory of Thermal Processes National Technical University of Athens Athens 15780 Greece Qingdao Huaru Energy Technology Company Limited Qingdao 266071 China Mitsubishi Hitachi Power Systems Europe GmbH Schifferstraße 80 Duisburg 47059 Germany

The high percentage of renewable energy penetration poses volatility and intermittency challenges, making it imperative to explore pathways for large-scale green hydrogen production and utilization. In the present work, a novel power-to-H 2 -to-power (PtH2tP) system is proposed for onshore wind accommodation, incorporating hydrogen mixed gas turbines (HMGTs). An innovative methodology integrating economic and carbon emissions assessment with optimal dispatch is developed, in which the HMGT off-design operational characteristics and policy compensation for green hydrogen are considered. A case study in China demonstrates the feasibility of the PtH2tP system in achieving flexible energy conversion and hydrogen self-sufficiency. Particularly, a levelized cost of electricity of 0.0537 €/kWh and carbon emissions of 0.29 kg CO 2 eq/kWh are observed. The fuel consumption of HMGTs and purchased grid electricity are significant contributors to carbon emissions. A comprehensive sensitivity analysis indicates an optimal hydrogen substitution ratio of 31% as the threshold for balancing economics and environmental benefits.

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Co_(2)N Nanoparticles Anchored on N-Doped Active Carbon as Catalyst for Oxygen Reduction Reaction in Zinc–Air Battery

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Energy & Environmental Materials 2022年第3期5卷 935-943页

作者： Xianli Wu Guosheng Han Hao Wen Yanyan Liu Lei Han Xingyu Cui Jiajing Kou Baojun Li Jianchun Jiang Research Center of Green Catalysis College of ChemistryZhengzhou University100 Science RoadZhengzhou 450001China National Engineering Laboratory for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China College of Science Henan Agricultural UniversityZhengzhou 450002China Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveIN 47906United States State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University28 Xianning West RoadXi'an 710049China

The development of efficient catalytic electrode toward oxygen reduction reaction(ORR)is still a great challenge for the wide use of zinc–air ***,Co_(2)N nanoparticles(NPs)anchored on N-doped carbon from cattail were verified with excellent catalytic performances for *** onset and half-wave potentials over the optimal catalyst reach to 0.96 V and 0.84 V,*** retention rates of 96.8%after 22-h test and 98.8%after running 1600 s were obtained in 1 M methanol *** functional theory simulation proposes an apparently increased electronic states of Co_(2)N in N-doped carbon layer close to the Fermi *** charge density,favorable adsorption,and charge transfer of intermediates originate from the coexistence of Co_(2)N NPs and N atoms in carbon *** superior catalytic activity of composites also was confirmed in zinc–air *** novel catalytic property and controllable preparation approach of Co_(2)Ncarbon composites provide a promising avenue to fabricate metal-containing catalytically active carbon from biomass.

关键词： catalytically active carbon Co2N nanoparticles N-doping oxygen reduction reaction zinc–air battery

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