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A study on periodic boundary condition in direct numerical simulation for gas–solid flow

Chinese Journal of Chemical Engineering 2020年第1期28卷 236-241页

作者： Shiwen Liu Xiaowen Liu Feiguo Chen Limin Wang Wei Ge State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Direct numerical simulation(DNS) of gas–solid flow at high resolution has been carried out by coupling the lattice Boltzmann method(LBM) for gas flow and the discrete element method(DEM) for solid particles. However,the body force periodic boundary condition(FPBC) commonly used to cut down the huge computational cost of such simulation has faced accuracy concerns. In this study, a novel two-region periodic boundary condition(TPBC) is presented to remedy this problem, with the flow driven in the region with body force and freely evolving in the other region. With simulation cases for simple circulating fluidized bed risers, the validity and advantages of TPBC are demonstrated with more reasonable heterogeneity of the particle distribution as compared to the corresponding case with FPBC.

关键词： Direct numerical simulation Periodic boundary condition Two-region periodic boundary condition gas–solid flow Heterogeneity

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Ferrocene-induced switchable preparation of metal-nonmetal codoped tungsten nitride and carbide nanoarrays for electrocatalytic HER in alkaline and acid media

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Nano Research 2023年第2期16卷 2085-2093页

作者： Jian Zhou Fanfan Wang Haiqing Wang Shuxian Hu Weijia Zhou Hong Liu Institute for Advanced Interdisciplinary Research(iAIR) School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Department of Physics University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Transition metal nitride/carbide(TMN/C)have been actively explored as low-cost hydrogen evolution reaction(HER)electrocatalysts owing to their Pt-like physical and chemical properties.Unfortunately,pure TMN/C suffers from strong hydrogen adsorption and lacks active centers for water dissociation.Herein,we developed a switchable WO_(3)-based in situ gas–solid reaction for preparing sophisticated Fe-N doped WC and Fe-C doped WN nanoarrays.Interestingly,the switch of codoping and phase can be effectively manipulated by regulating the amount of ferrocene.Resultant Fe-C-WN and Fe-N-WC exhibit robust electrocatalytic performance for HER in alkaline and acid electrolytes,respectively.The collective collaboration of morphological,phase and electronic effects are suggested to be responsible for the superior HER activity.The smallest|ΔGH*|value of Fe-NWC indicates preferable hydrogen-evolving kinetics on the Fe-N-WC surface for HER under acid condition,while Fe-C-WN is suggested to be beneficial to the adsorption and dissociation of H_(2)O for HER in alkaline electrolyte.

关键词： gas–solid reaction tungsten nitride/carbide codoping phase regulation hydrogen evolution

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CFD studies on the separation performance of a new combined gas–solid separator used in TMSR-SF

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Nuclear Science and Techniques 2019年第9期30卷 61-72页

作者： Mengdan Wu Ning Zhang Jinguo Zhai Guo-Yan Zhou Shan-Tung Tu Key Laboratory of Pressure Systems and Safety (MOE) School of Mechanical and Power Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Shanghai Research Institute of Chemical Industry Shanghai 200062 China

In order to comply with discharge standards, a gas–solid separator is used to remove solid particles from the thorium molten salt reactor-solid fuel (TMSR-SF) system. As a key component, it directly determines system energy efficiency. However, current gas–solid separators, based on activated carbon adsorption technology, result in high pressure drops and increased maintenance costs. In the present study, a new combined gas–solid separator was developed for the TMSR-SF. Based on a simplified computational fluid dynamics (CFD) model, the gas–solid twophase flow and the motion trajectory of solid particles were simulated for this new separator using commercial ANSYS 16.0 software. The flow and separation mechanism for this structure were also been discussed in terms of their velocity effects and pressure field distributions, and then the structure was optimized based on the influence of key structural parameters on pressure and separation efficiency. The results showed that the standard k–ε model could be achieved and accurately simulated the new combined separator. In this new combined gas–solid separator, coarse particles are separated in the first stage using rotating centrifugal motion, and then fine particles are filtered in the second stage, giving a separation efficiency of up to 96.11%. The optimum blade inclination angle and numbers were calculated to be 45° and four, respectively. It implicated that the combined separator could be of great significance in a wide variety of applications.

关键词： Combined separator gas–solid two-phase flow Structure optimization CFD TMSR-SF

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Numerical investigation of particle deposition on converging slot-hole film-cooled wall

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Journal of Central South University 2017年第12期24卷 2819-2828页

作者：周君辉张靖周 College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016 China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016 China

Numerical research on the dilute particles movement and deposition characteristics in the vicinity of converging slot-hole(console) was carried out, and the effect of hole shape on the particle deposition characteristics was investigated. The EI-Batsh deposition model was used to predict the particle deposition characteristics. The results show that the console hole has an obvious advantage in reducing particle deposition in comparison with cylindrical hole, especially under higher blowing ratio. The coolant jet from console holes can cover the wall well. Furthermore, the rotation direction of vortices near console hole is contrary to that near cylindrical hole. For console holes, particle deposition mainly takes place in the upstream area of the holes.

关键词： gas–solid flow particle deposition film-cooled wall converging slot film cooling hole numerical simulation

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Growth Kinetics of Nd2Fe14B Phase during Hydrogen-Induced Reverse Phase Transformation in Nd2Fe14B Type Nanocrystalline Magnetic Alloy

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Materials Sciences and Applications 2011年第8期2卷 1109-1115页

作者： Sergey Borisovich Rybalka 不详

The influence of hydrogen pressure on kinetics of growth of Nd2Fe14B phase during hydrogen-induced reverse phase transformations in the industrial Nd2Fe14B hard magnetic alloy has been studied. It has been determined that, as the temperature and the initial hydrogen pressure increase, a reverse phase transformation significantly accelerates. It has been shown that the kinetics of the reverse phase transformation is controlled by the Fe atoms diffusion and that the rate growth of new Nd2Fe14B phase increase with increase of initial hydrogen pressure. On the base of the Kolmogorov kinetic theory the kinetic equation describing influence of initial hydrogen pressure on the isothermal kinetic diagram for this transformation has been obtained.

关键词： Intermetallics Growth Kinetics Permanent Magnets gas–solid Reactions PACS numbers: 64.70.Kd 68.35.Fx 66.30.-h

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