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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Miaoli Hao Weitao Wu Suitao Qi Bolun Yang Jianming Yang Wei Zhang Jian Lv Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xi''an Modern Chemistry Research Institute Xi'an China

The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl 3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent on the isomerization rate were investigated. Under the conditions of removing both internal and external diffusion effects, a kinetic model was established and the model parameters were developed. The results showed that the endo- to exo- isomerization of THDCPD can be treated as a first-order reaction. The activation energy E 0 and pre-exponential factor obtained from Arrhenius plot are 116 kJ I mol and 3.39x10 13 respectively. The simulation results agreed well with the experimental data.

关键词： Kinetic theory Solvents Temperature Mathematical model Loading Fuels Feeds

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Enhancing Vertical-Axis Tidal Turbines with Strategic Superhydrophobic Surfaces for Optimized Aerodynamic and Self-Starting Performances

SSRN

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SSRN 2024年

作者： Yin, Dawei Sun, Jinjing School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer Shanghai200093 China

As observation and research on nature deepen, bionic and hydrophobic surface drag reduction are gaining increasing popularity among researchers. The application of bionic principles and hydrophobic surface technologies in the field of fluid dynamics has opened up new avenues for enhancing the performance of various engineering systems, including vertical-axis tidal turbines (VATTs). By mimicking the natural mechanisms observed in certain species, such as the lotus effect, researchers have been able to develop superhydrophobic surfaces (SHS) that significantly reduce drag in fluid ***, SHS have been applied uniformly across the entire surface of an airfoil. However, this study takes a more nuanced approach by investigating the impact of SHS application at different positions on the airfoil. Through numerical simulations, the study explores how varying the distribution of SHS can influence the power coefficient (Cp), a key performance metric for VATTs . The findings from the study are quite revealing. At a tip speed ratio (TSR) of 1.68, the study observes that applying SHS to 30% of the chord length near the leading edge of the airfoil yields the maximum relative power coefficient benefit, with an increase of up to 34.8%. This suggests that strategic placement of SHS can lead to significant performance improvements without the need for uniform application, which could potentially reduce material costs and maintenance requirements. Moreover, the study also finds that applying SHS only on the inner surface of the VATT can result in a 32% increase in the power coefficient. This indicates that the inner side of the airfoil, which experiences the higher pressure side of the fluid flow, is particularly sensitive to the drag reduction effects of SHS. The leading edge of the airfoil is another critical area where SHS application can have a substantial impact. The leading edge is the first point of contact between the airfoil and the fluid, and any reduc

关键词： Drag reduction

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An optimal design of the widths of heat affect zone, fusion zone, and near interface zone in a dissimilar metal welded joint

Material Design and Processing Communications

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Material Design and Processing Communications 2020年第5期2卷

作者： Guo, Guoliang Yang, Jie Wang, Lei Liu, Guiqiu Zhang, Baozhong Zhang, Sihan Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China Consumer Appliances Centre Shandong Product Quality Inspection Research Institute Shandong China

The optimal design of the dissimilar metal welded joint is a valuable research issue, whether optimize the material, processing technology, dimension, or anything else. The fracture behavior of the dissimilar metal welded joint have been found affected by the widths of heat affect zone, fusion zone, and near interface zone. In this study, the optimal design of the widths of heat affect zone, fusion zone, and near interface zone in the dissimilar metal welded joint was further studied systematically. Firstly, a dissimilar metal welded joint, which used in the nuclear power plants with either heat affect zone crack or fusion zone crack, was selected, and a width mismatch coefficient MW was defined. In addition, the crack propagation paths and J-resistance curves of the dissimilar metal welded joints under different MW induced by the widths of heat affect zone, fusion zone, and near interface zone were calculated. Based on the obtained results, the widths of heat affect zone, fusion zone, and near interface zone were optimized. This study will provide support for the design of the dissimilar metal welded joint and is significant to the structure integrity assessment of the nuclear power plants. © 2019 John Wiley & Sons, Ltd.

关键词： Nuclear fuels

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Supersonic Ejector to Boost Production from Low Pressure Natural Gas Field

Supersonic Ejector to Boost Production from Low Pressure Nat...

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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM)

作者： Gesheng Wu Daotong Chong Weixiong Chen Junjie Yan State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Southwest Petroleum University Chendu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energy of high pressure gas wells, which was generally wasted through the choke valve, as its power supply to boost the low pressure gas production. The field experiment of the natural gas ejector was carried out, and the performance of the ejector was also presented. Moreover, the production of low pressure natural gas well was compared when the natural gas ejector was used or not. The economic analysis shows that the recovery period of the capital was less than several months.

关键词： Monitoring Computers Distributed control

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Influence of differential pressure fluctuation on flow measurement of gas-liquid two-phase flow in orifice plate

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第10期37卷 2136-2141页

作者： Zheng, Xue-Bo Fan, Chen Che, Yu-Quan Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Oil and Gas Technology Institute of Changqing Oilfield Company Xi'an710021 China PetroChina Xinjiang Oilfield Branch Company Karamay834000 China

Differential pressure fluctuation is an inherent physical phenomenon in gas-liquid two-phase flow, which can be used to measure the quality and the whole flowrate. In order to study the influence of differential pressure fluctuation on gas-liquid two-phase flow metering for orifice plate, the differential pressure fluctuating processes under different flow conditions were measured, with the pressure ranging from 0.7 MPa to 1.0 MPa, the gas mass flow rate ranging from 200 kg/h to 400 kg/h, and the quality ranging from 0.4 to 1.0, respectively. The experimental results show that the mean value of the differential pressure and the standard deviation of the differential pressure could reflect changes of the flow parameters of the two-phase flow, whereas the standard deviation of the differential pressure is with poor repeatability. In the experiments, the repeatability of the standard deviation varied in the range of ±0.3%~±18.5%. For the two phase flow with low liquid content (LVF © 2016, Science Press. All right reserved.

关键词： flow measurement

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Short-term Microgravity Experiment of Pool Boiling Heat Transfer Utilizing the Drop Tower Beijing

Short-term Microgravity Experiment of Pool Boiling Heat Tran...

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Asina Microgravity Pre-Symposium——9th China-Japan-Korea Workshop on Microgravity Sciences(第九届中日韩微重力科学学术会议暨亚洲微重力科学大会)

作者： Jing Li Wang-Fang Du Yan-Fang Xue Jin-Jia Wei Jian-Fu Zhao Key Laboratory of Microgravity Institute of MechanicsChinese Academy of Sciences.Beijing100190China State Key Laboratory of Multiphase Flow in Power EngineeringXi''an Jiaotong UniversityXi''an 710049China

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Laser-induced breakdown spectroscopy in Asia

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Frontiers of Physics 2016年第6期 226-250页

作者：王珍珍出口祥啓张臻臻王哲曾晓雁严俊杰 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Graduate School of Advanced Technology and Science Tokushima University State Key Lab of Power Systems Department of Thermal EngineeringTsinghua-BP Clean Energy CenterTsinghua University Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology

Laser-induced breakdown spectroscopy(LIBS) is an analytical detection technique based on atomic emission spectroscopy to measure the elemental *** has been extensively studied and developed due to the non-contact,fast response,high sensitivity,real-time and multi-elemental detection *** development and applications of LIBS technique in Asia are summarized and discussed in this review *** researchers in Asia work on different aspects of the LIBS study in fundamentals,data processing and modeling,applications and *** to the current research status,the challenges,opportunities and further development of LIBS technique in Asia are also evaluated to promote LIBS research and its applications.

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ChatGPT in Scientific Research and Writing 1

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1000年

作者： Jie Han Wei Qiu Eric Lichtfouse

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Review, Numerical Validation, and Experiment Verification for Definite Solution Analogy Theory (Dsat) in Thermal-Hydraulic Scaling

SSRN

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SSRN 2024年

作者： Li, Xinyu Zhang, Dalin Jiang, Dianqiang Zhou, Xingguang Lv, Xindi Tian, Wenxi Qiu, Suizheng Su, Guanghui 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’an710049 China China

The new generation of reactor technology: Fluoride-Salt-cooled high-Temperature Advanced Reactor (FuSTAR), mainly applied to the steady supply of stable electricity and high-temperature process heat for remote, underground, and arid areas. So far, the design of the heat transport system and Passive Residual Heat Removal System (PRHRS) of FuSTAR has been finished, but the scaling and experiment verification still needs to be carried out. In this study, the Definite Solution Analogy Theory (DSAT) was used for scaling analysis, and the scaling experiment platform of PRHRS was built. DSAT was verified through numerical simulation and experiment results, which can support the design and optimization of the PRHRS. The numerical test results show that the similar distribution of physical fields in dimensionless space on the prototype and experiment is realized under the DSAT framework. The steady-state experiment results show that the prototype of PRHRS can take away more than 1% of the decay heat of the total thermal power and has a margin of about 15% under a stable natural cycle. The maximum deviation between the measured temperature and the calculated value with DSAT is more than 4°C. The transient experiment results show that the maximum deviation of dimensionless solutions is less than 4%, which proves the high accuracy of DSAT and the PRHRS based on this framework can effectively remove the decay heat in the reactor. This work can be used to extend the scaling method of thermal-hydraulic in high dimensional space and transient conditions. © 2024, The Authors. All rights reserved.

关键词： Fluorine compounds

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Molecular dynamics study of shale oil adsorption and diffusion behavior in reservoir nanopores: Impact of hydrocarbon composition and surface type

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Journal of Molecular Liquids 2024年第PartA期414卷

作者： Zheng, Lichen Zhao, Qiuyang Adams, Michael J. Alexiadis, Alessio Wang, Yechun Jin, Hui Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China School of Chemical Engineering University of Birmingham BirminghamB15 2TT United Kingdom

Understanding shale oil adsorption in reservoir nanopores is essential for efficient extraction. This study used MD simulations to analyze the adsorption and diffusion of two- and multi-component hydrocarbons (Aromatics, Alkanes, Resin) on various shale surfaces (Calcite, Montmorillonite, Quartzite, Organic) at 353 K and 25 MPa. Hydrocarbons formed a bilayer adsorption structure comprising a high-concentration adsorption layer (L1, 0.35–0.90 g/cm3) and a low concentration weak adsorption layer (L2), with adsorption density ranked as Resin > Aromatics > Alkanes. Reservoir surfaces were classified as ionic (e.g., calcite, montmorillonite) and non-ionic (e.g., quartz, graphite), and polar hydrocarbons exhibited higher adsorption densities and energies on ionic surfaces due to combined electrostatic and van der Waals interactions, while non-ionic surfaces showed smaller adsorption differences. For multicomponent hydrocarbons, adsorption layer densities followed the order: graphite > MMT-SiO > quartz > calcite > MMT-Na, with competitive adsorption observed. The polar component exhibited a greater adsorption advantage on the calcite, MMT-SiO side and graphite surfaces due to electrostatic interactions and π-π interactions, and a lesser advantage on the MMT-Na side and quartz surfaces. Hydrocarbon diffusivity was influenced by molecular mass and polarity and ordered as Alkanes > Aromatics Resin. Polar molecules had a weaker diffusion than nonpolar molecules at similar molecular masses. Among the multicomponent hydrocarbons, the self-diffusion coefficient (Self-D) of Resin increased, while that of lighter components decreased compared to two-component systems. These findings offer strategies for improving shale oil recovery by tailoring injection fluids to reservoir types, anionic surfactants or chelating agents may be used to reduce electrostatic interactions in carbonate and clay reservoirs, while nonionic surfactants may be more effective in quartz reservoirs. © 2024

关键词： Nonionic surfactants

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