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Simulation and experiment investigations on fabrication of Fe-based amorphous powders by a novel atomization process equipped with assisted gas nozzles

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Journal of Iron and Steel Research International 2023年第6期30卷 1142-1155页

作者： Jia-qi Liu Yan-nan Dong Pu Wang Huan Zhao Jing Pang Xiao-yu Li Jia-quan Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Qingdao Yunlu Advanced Materials Technology Co. Ltd.Qingdao 266232ShandongChina

Based on computational fluid dynamics method,the effect of atomization gas pressure on the atomization efficiency of Laval nozzle was studied,and then a discrete phase model was established and combined with industrial trials to study the effect of a new type of assisted gas nozzles(AGNs)on powder size distribution and amorphous powder *** results show that increasing the atomization pressure can effectively improve the gas velocity for the Laval nozzle;however,it will decrease the aspiration pressure,and the optimal atomization pressure is 2.0 *** with this,after the application of AGNs with the inlet velocity of 200 m s^(-1),assisted gas jet can increase the velocity of overall droplets in the break-up and solidification area by 40 m s^(-1) and the maximum cooling rate is increased from 1.9×10^(4) to 2.3×10^(4) K s^(-1).The predicted particle behavior is demonstrated by the industrial trails,that is,after the application of AGNs,the median diameter of powders d50 is decreased from 28.42 to 25.56 lm,the sphericity is increased from 0.874 to 0.927,the fraction of amorphous powders is increased from 90.4% to 99.4%,and only the coercivity is increased slightly due to the accumulation of internal *** is illustrated that the AGNs can improve the yield of fine amorphous powders,which is beneficial to providing high-performance raw powders for additive manufacturing technology.

关键词： Computational fluid dynamics Atomization Assisted gas nozzle discrete phase model Amorphous powder

Numerical investigation of basic oxygen furnace slag modification with gas bottom-blowing and SiO_(2) modifier

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Journal of Iron and Steel Research International 2023年第7期30卷 1451-1460页

作者： Chang Liu Yu-feng Tian Yong-li Xiao Yong-qian Li Yang Li Guang-qiang Li Qiang Wang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina Ruipu Technology Group Co. Ltd.Lishui 323900ZhejiangChina Central Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201900China

To avoid the volume expansion of basic oxygen furnace (BOF) slag for use in building materials, a hot slag modification process was proposed to reduce free CaO (f-CaO) in the molten slag. A transient 3D numerical model of BOF molten slag modification by SiO_(2) particles was established. The flow and heat transfer of molten slag, movement and dissolution of the modifier, and concentration distribution of f-CaO in slag during the modification of BOF were studied. The distribution of f-CaO concentration is inhomogeneous all over the molten slag. The mixing effect at the slag surface is weaker than that at the half-height plane of the slag. To consume the f-CaO below 2.0 wt.% in the slag, the optimum quantity of the SiO_(2) modifier is 10.0% of the mass of the slag. The fine SiO_(2) particles help attain a lower final mass fraction of f-CaO and a higher SiO_(2) utilization ratio.

关键词： Basic oxygen furnace slag modification SiO_(2)modifier Free CaO discrete phase model Computational fluid dynamics

Numerical simulation of spray performance based on the Euler-Lagrange Approach

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Journal of Thermal Science 2009年第1期18卷 91-96页

作者： Yujia Tao Xiulan Huai Ziyi Guo Ran Yin Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China University of Science and Technology Beijing Beijing 100083 China

Numerical simulations have been carried out to investigate the liquid atomization and spray process using the discrete phase model of the commercial CFD code combined with the Wall-Film boundary conditions. The effects of spray parameters on droplets Santer mean diameter （SMD）, droplet collision speed, the thickness of liquid-film, the surface temperature and its uniformity were analyzed in the present study. The simulation results and the experimental data obtained in the available literature agree within 13.8%, The computational results show that the spray pressure is the main factor to realize the atomization. Increasing the mass flux and the spray pressure, the droplet collision speed increases while the corresponding maximum film thickness on the heated surface declines. The surface temperature changes indistinctively with the increase of the spray distance, but the temperature distribution tends to be uniform.

关键词： liquid atomization discrete phase model Wall-film numerical simulation

Oxygen and Glucose Transportation and Distribution on 3D Osteochondral Scaffold in Silico model

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Journal of Bionic Engineering 2022年第4期19卷 1100-1108页

作者： Ziyu Liu Hao Huang Jingying Yang Maryam Tamaddon Haoyu Wang Yingying Gu Zhenyun Shi Chaozong Liu Division of Surgery and Interventional Science Royal National Orthopaedic HospitalUniversity College LondonStanmoreLondon HA74LPUK Beijing Advanced Innovation Centre for Biomedical Engineering School of Engineering MedicineBeihang UniversityBeijing 100083China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China

Nutrients supply especially like nutrients and oxygen play vital role in tissue engineering *** is found that tissue could not grow very well in the middle of the scaffold because few nutrients could transport to the *** limitations would reduce cell proliferation and *** that case,there is urgent need to understand the nutrient distribution for both in vitro and in vivo study,as no technology is able for researchers to observe the nutrients transport during those *** this paper,a numerical model coupling with VOF(volume of fluid)model and species transport model together for predicting the distribution of oxygen and glucose in the scaffold after implantation in to the site is *** with our previous in vivo tests,the regenerated tissue distribution has a similar trend as oxygen distribution rather than *** reported scaffold manufactured by additive manufacturing provided a good interconnected structure which facilitated the nutrient transportation in the *** nutrient transportation,this numerical model could be used in better understanding the nutrients transportation in the scaffold,and leading to a better understanding of tissue formation in the scaffold.

关键词： Nutrient transport Scaffold Nutrient distribution Computational fluid dynamic discrete phase model

modelling and analysis of initial icing roughness with fixed-grid enthalpy method based on DPM-VOF algorithm

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Chinese Journal of Aeronautics 2022年第7期35卷 168-178页

作者： Jie LIU Peng KE Department of Civil Helicopter Research and Development China Helicopter Research and Development InstituteTianjin 300000China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China

Ice particles could form under the continuous impingement of incoming supercooled droplets in icing conditions,which will change the surface roughness to enhance the further heat and mass transfer during icing process.A fixed-grid porous enthalpy method based on the improved discrete phase model(DPM)and Volume of Fluid(VOF)integrated algorithm is developed to solve the multiphase heat transfer problem to give more detailed demonstration of the formation of initial ice *** algorithms to determine the criterion of transformation from DPM to VOF and the allocation of source items during transformation are improved to the general DPM-VOF *** verification cases,namely two glycerine-solution droplets impact and single droplet freeze,are conducted to verify the accuracy and reliability of the enthalpy-DPMVOF method,where the simulation results match well with experiment *** roughness on a NACA0012 airfoil is precisely captured and the effects on convective heat transfer characteristics are preliminarily *** results illustrate that the enthalpy-DPM-VOF method could successfully capture the characteristics of motion and the phase change process of droplet,as well as balance the calculation accuracy and efficiency.

关键词： discrete phase model Fixed-grid porous enthalpy method Ice roughness Icing modelling Integrated algorithm Multiphase heat transfer Volume of fluid

Numerical Investigation of the Deposition Characteristics of Snow on the Bogie of a High-Speed Train

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Fluid Dynamics & Materials Processing 2020年第1期16卷 41-53页

作者： Lu Cai Zhen Lou Nan Liu Chao An Jiye Zhang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengduChina CRRC Tangshan Co. Ltd.TangshanChina

To investigate the deposition distribution of snow particles in the bogie surfaces of a high-speed train,a snow particle deposition model,based on the critical capture velocity and the critical shear velocity,was *** based on the unsteady Reynolds-Averaged Navier-Stokes(RANS)approach coupled with discrete phase model(DPM)were used to analyze the motion of snow *** results show that the cross beam of the bogie frame,the anti-snake damper,the intermediate brake clamps in the rear wheels,the traction rod and the anti-rolling torsion bar are prone to accumulate *** accumulation mass relating to the vertical surface in the rear region,horizontal surface in the front region and the corner area of the bogie is *** average snow accumulation mass for each component ordered from high to low is as follow:traction rod,frame,bolster,brake clamp 2,anti-rolling torsion bar,brake clamp 1,transverse damper,axle box 2,axle box 1,air spring,anti-snake damper,tread cleaning *** snow accumulation mass on the front components of the bogie is more significant than that relating to the rear ***,the average snow accumulation mass of rear brake clamp 2 and axle box 2 is about twice as high as that of the front brake clamp 1 and axle box 1.

关键词： High-speed train bogie discrete phase model snow drift snow accumulation

NUMERICAL STUDY ON EFFECT OF OPERATING TABLE PROTECTED BY HORIZONTAL LAMINAR FLOW SCREEN

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Transactions of Nanjing University of Aeronautics and Astronautics 2013年第3期30卷 292-296页

作者：范菊莉杨晓静王思涵郑小漪 College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

Transmission of airborne bacteria is the main factor causing surgical site infection(SSI),which is harmful to patients′health and even *** study is conducted on the effect of the operating table protected by horizontal laminar flow *** phase model(DPM)is *** simulation is carried out to evaluate particle trajectories with the Lagrange *** a result,the protecting effect of horizontal laminar flow screen is established,and the protecting parameters of the air velocity supplied by the screen and the protecting distance are *** optimized air velocity supplied by the screen should be at 0.4—0.6 m/*** the protecting distance should be less than 1.3 *** work provides references for the study on the depuration of operating table or room.

关键词： laminar flow screen particle trajectories discrete phase model operating table

Numerical Simulation of Multiphase phase Flow in Ladle Metallurgy

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Numerical Simulation of Multiphase Phase Flow in Ladle Metal...

Numerical Simulation of Oil DropletsTraces In the Oil-Gas Separator

“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Li Linmin Liu Zhongqiu Li Baokuan School of Materials and Metallurgy Northeastern University

Argon gas purgingin liquid steel plays a significant role in the ladle *** key aspect ofthis processis the bubble transport and slag layer *** movement plays a significant role in the phase structure andcauses the unsteady complex turbulent flow *** is one of the mostcrucial shortcomings of the current two-fluid *** present work advised a mathematical model using the large eddy simulation（LES）approach coupled with both the Eulerian volume of fluid（VOF）and the Lagrangian discrete phase model（DPM）to simulate the gas stirring *** argon gas bubble is tracked using the Lagrangian *** the liquid-slag-air free surfaces are tracked using the VOF *** procedure ofbubble coming out of the liquid and getting into the air is modeled using a user-defined *** results show that the current LES–DPM–VOF coupledmodel can well predict the unsteady bubble movement,slag eye formation,interface fluctuation,and particularly slag entrainment.

关键词： numerical simulation ladle metallurgy large eddy simulation discrete phase model

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Numerical Simulation of Oil DropletsTraces In the Oil-Gas Se...