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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 102-110页

作者： Qiang Liu Xiang Li Shen Du Ming Gao Yanbin Yin Jiongming Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the continuous casting process of high-Mn high-Al steels,various types of gases such as Ar need to escape through the top of the *** which,the behavior of bubbles traversing the liquid slag serves as a restrictive link,closely associated with viscosity and the thickness of liquid *** contrast to two-dimensional surface observation,three-dimensional(3D)analysis method can offer a more intuitive,accurate,and comprehensive ***,this study employs a 3D X-ray microscope(3D-XRM)to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag,different temperatures,and different holding *** results indicate that as basicity of slag increases from 0.52 to 1.03,temperature increases from 1423 to 1573 K,the viscosity of slag decreases,the floating rate of bubbles *** addition,when holding time increases from 10 to 30 s,the bubbles floating distance increases,and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually *** one word,increasing the basicity,temperature,and holding time leading to an increase in the removal rate of bubbles especially for the *** findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.

关键词： mold flux low basicity bubbles three-dimensional X-ray microscope viscosity

Effect of ordered helium bubbles on deformation and fracture behavior of α-Zr

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Journal of Materials Science & Technology 2019年第7期35卷 1466-1472页

作者： Si-Mian Liu Shi-Hao Li Wei-Zhong Han Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University

Radiation-induced helium bubbles are detrimental to the mechanical properties of metals, usually causing severe hardening and embrittlement. Hexagonal close-packed(HCP) α-Zr alloys are one of the primary structural materials for nuclear applications, however, the effect of helium bubbles on their deformation and fracture behaviors still remains unexplored. Here, we found that ordered helium bubbles prefer to align along the basal plane in HCP α-Zr. Micro-scale in situ tensile tests revealed that helium bubbles less than 8 nm in size can increase the critical resolved shear stress of the prismatic slip. However, once the helium bubbles are larger than 8 nm, a bubble-softening effect happens due to a decrease in number density of helium bubbles and an increase in porosity. Once the Schmid factor of basal slip is considerably higher than prismatic slip, bubble coalescence along the basal plane becomes the major failure mode in helium-irradiated α-Zr.

关键词： α-Zr Helium bubbles Prismatic slip Coalescence Fracture

Mechanics of 2D material bubbles

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Nano Research 2023年第12期16卷 13434-13449页

作者： Xuwei Cui Luqi Liu Wenlong Dong Yekai Zhou Zhong Zhang Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication and CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China University of Chinese Academy of Sciences Beijing 100049China

A variety of out-of-plane deformation patterns have been observed for two-dimensional(2D)materials including ripples,wrinkles,buckles,scrolls,folds,tents,and bubbles due to their extra-low bending *** them,the micro-and nanoscale bubbles arising from the deformation of the atomically thin membrane by gases,liquids,and solids trapped underneath 2D materials were frequently *** the one hand,the presence of bubbles may severely deteriorate the performance of 2D material devices because of the obstructed charge,photon,and phonon transport across the *** the other hand,these bubbles offer a novel avenue to explore the intrinsic mechanical parameters(e.g.,Young’s modulus and bending rigidity)of 2D materials as well as their interfacial properties(e.g.,shear stress and adhesion energy).Furthermore,these bubbles with stable and controllable morphology also act as effective knobs to tune the electronic and photonic performance of various 2D *** review highlights the recent progress on the 2D material bubbles,which will be helpful for measurement of the mechanical properties of ultrathin 2D materials and the applications of developing 2D material devices.

关键词： two-dimensional(2D)materials bubbles mechanics interface strain engineering

Interior non-uniformity of acoustically excited oscillating gas bubbles

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Journal of Hydrodynamics 2019年第4期31卷 725-732页

作者： Yu-ning Zhang Xiao-fei Li Zhong-yu Guo Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education) School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China Key Labor at oiy of Fluid and Power Machinery Ministry of Education Xihua IJnivarsily Chengdu 610039 China College of Mechanical and Transportation Engineering China University of Petroleum-Beijing Beijing 102249 China Beijing Key Laboratory of Process Fluid Filtration and Separation China University of Petroleum-Beijing Beijing 102249 China

In the present paper, the interior non-uniformity of oscillating gas bubbles in liquids under an acoustic field is theoretically investigated, as well as the temperature non-uniformity in the surrounding liquid. The pressure, the density and the temperature inside the gas bubbles are quantitatively predicted for a wide range of bubble Mach numbers. It is shown that the bubble interior non-uniformity increases significantly with the increase of the bubble Mach number. In the case of a large Mach number, the values of aforementioned paramount parameters at the bubble center are significantly larger than those at the bubble interface. Except for a very thin layer close to the bubble interface, the effects of the temperature non-uniformity in the bulk liquid could be safely ignored.

关键词： Cavitation gas bubbles acoustic field radial oscillation non-uniformity Mach number

Simulation study on factors influencing the entrainment behavior of liquid steel as bubbles pass through the steel/slag interface

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 511-519页

作者： Xiang Li Yan-ping Bao Min Wang Lu Lin State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

In this study, a water/silicone oil interface was used to simulate the steel/slag interface in a converter. A high-speed camera was used to record the entrainment process of droplets when air bubbles were passed through the water/silicone oil interface. Motion parameters of the bubbles and droplets were obtained using particle kinematic analysis software, and the entrainment rate of the droplets was calculated. It was found that the entrainment rate decreased from 29.5% to 0 when the viscosity of the silicone oil was increased from 60 mPa.s to 820 mPa.s in the case of bubbles with a 5 mm equivalent diameter passing through the water/silicone oil interface. The results indicate that in- creasing the viscosity of the silicone oil is conducive to reducing the entrainment rate. The entrainment rate increased from 0 to 136.3% in the case of silicone oil with a viscosity of 60 mPa.s when the equivalent diameter of the bubbles was increased from 3 mm to 7 ram. We there- fore conclude that small bubbles are also conductive to reducing the entrainment rate. The force analysis results for the water colmnn indicate that the entrainment rate of droplets is affected by the velocity of the bubble passing through the water/silicone oil interface and that the en- trainment rate decreases with the bubble velocity.

关键词： steelmaking bubbles interfaces entrainment influencing factors simulation studies

In-situ TEM study on the evolution of dislocation loops and bubbles in CeO_(2)during Kr^(+)single-beam and Kr^(+)-H_(2)^(+)dual-beam synergetic irradiation

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Journal of Materials Science & Technology 2022年第28期123卷 49-59页

作者： Ziqi Cao Guang Ran Zhen Wang Yipeng Li Xiaoyong Wu Lu Wu Xiuyin Huang Huajun Mo College of Energy Xiamen UniversityXiamen 361102China The First Sub-Institute Nuclear Power Institute of ChinaChengdu 610041China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen 361102China

CeO_(2)is widely used as the nonradioactive surrogate fuel of UO_(2)when studying the irradiation performance of UO_(2).The evolution and characteristics of dislocation loops and bubbles in CeO_(2)foils were studied by in-situ transmission electron microscopy(TEM)observation during 400 ke V Kr^(+)&30 ke V H_(2)^(+)dual-beam synergetic irradiation and 400 ke V Kr^(+)single-beam irradiation at 1073 *** rotation of the habit plane of dislocation loops induced by above ion irradiation was found in the CeO_(2)for the first time,such as from[211]to[311]and then to[100].The rafted loops were first observed under Kr^(+)&H_(2)^(+)dual-beam synergetic irradiation,which not only had similar[111]direction,but also belonged to perfect dislocation loops(PDLs).The rafted loops were formed not only by the growth of loops that absorbed irradiation defects,but also by the combination of ***,this phenomenon of loop rafting was not obvious during Kr single-beam *** was first found that Kr^(+)irradiation induced the change of Burgers vectors of *** absorption of large PDLs to small PDLs was also *** average size and areal number density of dislocation loops and gas bubbles as a function of irradiation dose were constructed,which showed that the addition of H_(2)^(+)obviously affected the characteristics of dislocation loops and gas bubbles and the swelling of CeO_(2).

关键词： Nuclear Fuel Cerium dioxide In-situ TEM Irradiation Dislocation bubbles

Finite-thickness effect of the fluids on bubbles and spikes in Richtmyer–Meshkov instability for arbitrary Atwood numbers

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Plasma Science and Technology 2019年第2期21卷 9-15页

作者： Wanhai LIU Changping YU Pei WANG Zheng FU Lili WANG Yulian CHEN Research Center of Computational Physics Mianyang Normal University LHD Institute of MechanicsChinese Academy of Sciences Institute of Applied Physics and Computational Mathematics Mechanical and Electrical Engineering Department Lanzhou Resources and Environment Voc-Tech College

This paper investigates the finite-thickness effect of two superimposed fluids on bubbles and spikes in Richtmyer–Meshkov instability(RMI) for arbitrary Atwood numbers by using the method of the small parameter expansion up to the second order. When the thickness of the two fluids tends to be infinity, our results can reproduce the classical results where RMI happens at the interface separating two semi-infinity-thickness fluids of different densities. It is found that the thickness has a large influence on the amplitude evolution of bubbles and spikes compared with those in classical RMI. Based on the thickness relationship of the two fluids, the thickness effect on bubbles and spikes for four cases is discussed. The thickness encourages(or reduces)the growth of bubbles or spikes, depending on not only Atwood number, but also the relationship of the thickness ratio of the heavy and light fluids, which is explicitly determined in this paper.

关键词： Richtmyer–Meshkov instability bubbles and spikes finite-thickness

Drag coefficient and volume fraction of bubbles in a supercritical water fluidized bed

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Particuology 2021年第4期19卷 127-138页

作者： Hao Wang Youjun Lu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

The supercritical water fluidized bed(SCWFB)is a recently introduced reactor for biomass gasification that does not release *** groups of Geldart B-type quartz sands with different particle sizes were fluidized at a system pressure of 20-27 MPa and system temperature of 410-570℃.A series of experiments were performed for determining the drag coefficient and volume fraction of *** effects of the particles’size,superficial velocity,system pressure,and temperature on the drag coefficient and volume fraction are *** addition,a correlation between experimental and computed values is demonstrated for both the drag coefficient and volume fraction in *** relative error of the correlation is within±30%.The results of this study provide significant guidance for the scaling-up design of SCWFBs and for the development of supercritical water gasification technology.

关键词： Supercritical water fluidized bed bubbles Drag coefficient Volume fraction

Effect of bubbles addition on teetered bed separation

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International Journal of Mining Science and Technology 2015年第5期25卷 835-841页

作者： Ni Chao Xie Guangyuan Liu Bo Bu Xiangning Peng Yaoli Sha Jie School of Chemical Engineering and Technology China University of Mining & Technology Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining & Technology

To improve the separation efficiency of a conventional Teetered Bed Separator(TBS) in beneficiation of fine coal with a wide size range,an Aeration TBS(A-TBS) was proposed in this *** bubbles were introduced to A-TBS by a self-priming micro-bubble *** study theoretically analyzed the effect of bubbles on the difference in hindered settling terminal velocity between different density particles,investigated the impact of superficial water velocity(V_(SW)) and superficial gas velocity(V_(Sg)) on bed fluidization,and compared the performance of the TBS and A-TBS in treating 1-0.25 mm size fraction *** results show that the expansion degree of fluidized bed which was formed by different size particles or has different initial height,is increased by the introduction of *** with the TBS,at the same level of clean coal ash content,the A-TBS shows an increase in the combustible recovery of clean coal,ash content of tailings,and practical separation density by 5.26%,6.56%,and 0.088 g/cm3 respectively,while it shows a decrease in the probable error(E_p) and V_(SW) by 0.031 and 3.51 mm/s,*** addition of bubbles at a proper amount not only improves the separation performance of TBS,but also reduces the upward water velocity.

关键词： Teetered bed separator Fine coal bubbles Superficial water velocity Superficial gas velocity

SOME FEATURES OF THE TURBULENCE PRODUCED BY RISING AIR bubbles IN WATER

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Science China Mathematics 1991年第12期34卷 1458-1466页

作者：贾复柳绮年陈学武 Institute of Mechanics Academia Sinica Beijing 100080 PRC

Presented in this paper is an experimental study on the characteristics of the turbulenceproduced by rising air bubbles in water. The measurements of turbulent velocities weremade by using visualization technique of particle streak and computer image processing ofthe flow field. The turbulence features have been examined, showing that the rising bubble-produced turbulence can be approximately modeled by homogeneous turbulence as in thecase of grid turbulence in air.

关键词： turbulence bubbles image processing.