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In situ establishment of Co/MoS_(2) heterostructures onto inverse opal‐structured N,S‐doped carbon hollow nanospheres:Interfacial and architectural dual engineering for efficient hydrogen evolution reaction

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SmartMat 2021年第4期2卷 591-602页

作者： Tingyu Lu Tongfei Li Desheng Shi Jialin Sun Huan Pang Lin Xu Jun Yang Yawen Tang Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsuChina 2 School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhouJiangsuChina Nanjing IPE Institute of Green Manufacturing Industry NanjingJiangsuChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijingChina

Rational design of low‐cost and high‐efficiency non‐precious metal‐based catalysts toward the hydrogen evolution reaction(HER)is of paramount significance for the sustainable development of the hydrogen *** manipulationinduced electronic modulation represents a sophisticated strategy to enhance the intrinsic activity of a non‐precious ***,we demonstrate the straightforward construction of Co/MoS_(2) hetero‐nanoparticles anchored on inverse opal‐structured N,S‐doped carbon hollow nanospheres with an ordered macroporous framework(denoted as Co/MoS_(2)@N,S-CHNSs hereafter)via a templateassisted *** experimental evidence and theoretical calculations reveal that the formation of Co/MoS_(2) heterojunctions can effectively modulate the electronic configuration of active sites and optimize the reaction pathways,remarkably boosting the intrinsic ***,the inverse opal‐structured carbon substrate with an ordered porous framework is favorable to enlarge the accessible surface area and provide multidimensional mass transport channels,dramatically expediting the reaction *** to the compositional synergy and structural superiority,the fabricated Co/MoS_(2)@N,S-CHNSs exhibit excellent HER activity with a low overpotential of 105mV to afford a current density of 10 mA/cm^(2).The rationale of interface manipulation and architectural design herein is anticipated to be inspirable for the future development of efficient and earth‐abundant electrocatalysts for a variety of energy conversion systems.

关键词： heterostructures hydrogen evolution reaction inversed opal structure MoS_(2)

Novel Design of In-Situ Hydrogen Sorption/Storage Integrated Enhanced Hydrogen Production in Supercritical Co2 Gasification, Air Gasification, and Steam Gasification from Biomass

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SSRN 2023年

作者： Yang, Tiebing Tie Dou, Binlin Zhang, Hua Wu, Kai Ning, Luo Chen, Haisheng Xu, Yujie Li, Wei Wu, Chunfei School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China Department of Energy Engineering Zhejiang University Hangzhou310027 China School of Chemistry and Chemical Engineering Queen's University Belfast BelfastBT7 1NN United Kingdom

Novel process on in-situ hydrogen sorption/storage during water gas shift (WGS) was proposed and the enhanced hydrogen production in supercritical CO2 gasification (CG), air gasification (AG), and steam gasification (SG) from biomass was integrated. The effects of temperature, pressure, steam-to-carbon (S/C) ratio, and adsorbent content for in-situ hydrogen sorption/storage on the enhanced hydrogen production were determined. The energy and exergy analysises under different thermodynamic conditions were calculated and compared. The results show that as the temperature increases, the hydrogen conversion and yield from water gas shift (WGS) reaction with in-situ hydrogen sorption/storage based on Mg-based sorbent were greatly increased, in which SG has the highest hydrogen yield and AG has the highest hydrogen conversion. The steam-to-carbon (S/C) ratio has a positive effect on the hydrogen production for all the processes, and also presents an effect on in-situ hydrogen sorption/storage during WGS. The methanation reaction was greatly inhibited by AG. The energy requirement order was SG> CG >AG, and the system energy can be supplied by in-situ hydrogen sorption/storage. © 2023, The Authors. All rights reserved.

关键词： Biomass

Study on Liutex-driven reward for intelligent flow control by dynamic feature-based deep reinforcement learning

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AIP Advances 2025年第5期15卷

作者： Wang, Qi Dong, Xiangrui You, Sunyu Cai, Xiaoshu School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering Shanghai200093 China

The issue of flow separation over an airfoil under weak turbulent conditions is addressed and resolved through the deep reinforcement learning (DRL) strategy. To suppress the generation of separation flow and the instability of the vortex shedding alley over an airfoil, a novel reward function named RLiutex, considering the suppression of the rigid rotation intensity and core size of the vortex, is first proposed in this paper. The great potential of this Liutex-driven reward for effective large eddy elimination and aerodynamic optimization is verified in this work. Furthermore, a dynamic feature-based DRL (DF-DRL) framework is redeveloped to markedly enhance the learning efficiency and convergence speed. The combination of the Liutex-driven reward function with the DF-DRL framework results in an exceptional aerodynamic performance, with minimal fluctuations in both drag and lift coefficients, highlighting the potential of this approach for advanced flow control strategies. © 2025 Author(s).

关键词： Deep reinforcement learning

Experimental Study on Deliquification with Atomizing Nozzle in Gas Well

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Experimental Study on Deliquification with Atomizing Nozzle ...

作者： Yutang Gao Xiaobai Li Peng Chang Lei Liu State Key Laboratory of Multiphase Flow in Power Engineering

Gas is a clean energy resource in comparison with oil and coal. Liquid-loading problem is frequently encountered in the process of gas production. It would directly cause the production of gas wells decreasing, even off production. A number of deliquification techniques have been suggested for solving this kind of problem, but the available techniques are not yet widely applicable. Based on the analysis, the method of deliquification with atomizing nozzle in gas wells was put forward. The test bench was designed for studying the atomization of nozzles and the liquid entrainment of gas flow. The size distribution of atomized droplets was measured by Malvern laser grain size analyzer. The Sauter mean diameters of atomized droplets were analysed under different two-phase flow conditions. The results indicate that the designed nozzles have good atomization performances and show potential application for reducing liquid loading in gas wells.

关键词： Gas well liquid loading deliquification atomizing nozzle two-phase flow

Nuclear Thermal Coupling Optimization of Baffled Ntp Reactor

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SSRN 2022年

作者： Duan, Zimian Zhang, Jing Han, Zichao Wang, Mingjun Wu, Yingwei He, Yanan Tian, Wenxi Qiu, Siuzheng Su, Guanghui Shaanxi Key Lab. of Advanced Nuclear Energy and Technology Xi’an Jiaotong University Xi’an710049 China Department of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

Nuclear thermal propulsion (NTP) technology has characteristics of high power and high specific impulse. In particular, CERMET fuel reactor has received a lot of research due to its simple form and structure. A general CERMET fuel reactor model is established by using three-dimensional Monte Carlo neutron dynamics program and commercial CFD program Fluent. After nuclear thermal coupling optimization, three partition schemes of baffled reactor were proposed to reduce the temperature difference between the wall and the coolant and lower the relative spike factor in the inner region. A feasible design of redundant control system was then proposed, with a cold clean excess reactivity greater than $3.44 and a minimum dry shutdown reactivity lower than -$5.95, where there was a high control accuracy of 6.7 pcm/mm. The reactor realized safety of the core temperature lower than 3000K under the conditions of total exit temperature of 2650K and thrust of 25000lb. © 2022, The Authors. All rights reserved.

关键词： Cermets

Thermal Stress in a Circular Nano-Inhomogeneity

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SSRN 2022年

作者： Huang, Haojie Xing, Shichao Song, Kun School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China School of Energy and Power Engineering Shanghai Key Laboratory of Power Enegy in Multiphase Flow and Heat Transfer Shanghai China Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes Tongling University Tongling244061 China School of Mechanical and Power Engineering Nanjing Tech University 30 Puzhu South Road Jiangsu Nanjing China

The thermal stress of nanocomposites is worth studying in that the extreme stress affects its reliability. In this paper, we propose a set of interfacial conditions to simulate the interfacial phonon scattering and interfacial elasticity in the nanocomposite, and obtain closed-form solutions for the thermal-elastic fields around the circular nano-inhomogeneity. The results show that the interfacial thermal stress within matrix is more sensitive to interfacial phonon scattering than that in the nano-inhomogeneity, while the size change of inhomogeneity has greater impact on the stress of the nano-inhomogeneity than that of the matrix. In view of the significant effects of thermal conductivities and thermal expansion coefficients on the thermal stress around inhomogeneity, the maximum von Mises stress is reduced up to three orders of magnitude by adjusting these parameters. More importantly, the thermal stresses within matrix and inhomogeneity can be respectively designed as "zero" even though the nanocomposite is subjected to a large thermal loading, which is viewed as an update mechanism of "neutral inhomogeneity". Our work provides guidance for the design of nanocomposites and has important potential applications. © 2022, The Authors. All rights reserved.

关键词： Thermal stress

Development and Assessment of a Novel Air/Water Hybrid Cooling System Coupling Two Units for Energy and Water Saving

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SSRN 2022年

作者： Wang, Jinshi Xue, Kai Zhang, Guilong Chen, Weixiong Li, Gen Zhang, Juntai Zhang, Guozhu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Electric Power Engineering South China University of Technology Guangzhou510641 China Datang Environment Industry Group Co. Ltd. Beijing100097 China

For the purpose of reducing coal consumption, decreasing CO2 emission, and improving economic interests of thermal power plants, a novel air/water hybrid cooling system coupling two units has been developed and assessed. The hybridization is achieved by the heat exchange of the circulating cooling water from two units, which is appropriate for the power plants with both water-cooling units and indirect air-cooling units, such as in North China region. Two schemes with different circulating water returning positions were compared on basis of thermodynamic and economic evaluation. Finally, the scheme that cooled circulating water was introduced to the air-cooling tower outlet was considered as the optimal design, which has the coal saving rate of 1.43 g/kWh at the design condition, with a 3.59-year payback period. In addition, this work focused on operation strategies to obtain optimum operation range, contributing to less coal consumption in summer and less water consumption in winter. The results indicate that annual coal consumption can be reduced by about 1400 tons in the reference power plant, the CO2 emission is decreased by 3490 tons, and 50000 tons of water could be saved. This technology is expected to be further promoted to practical engineering for the sustainable development. © 2022, The Authors. All rights reserved.

关键词： Thermoelectric power plants

Corrigendum to “Multi-scale coupling analysis of the flow blockage accident in the typical LFR” [Int. J. Therm. Sci., 195, January 2024, 108615]

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International Journal of Thermal Sciences 2024年 204卷

作者： Hanrui Qiu Mingjun Wang Jing Zhang Wenxi Tian G.H. Su State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China

Experimental Studies of Liquid Immersion Cooling for 18650 Lithium-Ion Battery Under Different Discharging Conditions

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SSRN 2022年

作者： Li, Yang Zhou, Zhifu Hu, Leiming Bai, Minli Gao, Linsong Li, Yulong Liu, Xuanyu Li, Yubai Song, Yongchen Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian116023 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi’an710049 China Department of Mechanical Engineering Carnegie Mellon University Pittsburgh15213 United States

In this study, the fluorinated liquid immersion cooling as a new cooling scheme has been tested and discussed for cooling the 18650 lithium-ion battery. OpteonTM SF33, with boiling point of 33.4oC, is chosen as the fluid for the immersion cooling. Comparison of the liquid immersion cooling and convective air cooling for a 18650 lithium-ion battery under 2C, 4C and dynamic load conditions are made. It is found that the immersion cooling better cools the battery cell under all these conditions. Under 4C discharging, the maximum cell temperature rise is 14.06°C for the forced air cooling, while is 4.97°C for the liquid immersion cooling. As the cooling fluid’s temperature basically governs the battery cell temperature, the cooling fluid’s temperature should not be too low. This study demonstrates that the lithium-ion battery has non-negligible power losses under cooling liquid temperature of 10oC and 15oC, compared with temperature above 20oC. Lastly, the two-phase boiling heat transfer mechanisms associated with immersion cooling of lithium-ion battery are discussed with bubble dynamics analysis. It is found under higher C rate, more aggressive boiling heat transfer is induced. The battery temperature is controlled to be below 34.5oC even under 7C discharging condition. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries