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Towards implementation of alloy-specific thermo-fluid modelling for laser powder-bed fusion of Mg alloys

Journal of Magnesium and Alloys 2024年第6期12卷 2327-2344页

作者： Mohammad Hoseini-Athar mikael ersson Peter Hedström Department of Material Science and Engineering KTH Royal Institute of TechnologyStockholmSE-10044 Sweden

Multi-physics thermo-fluid modeling has been extensively used as an approach to understand melt pool dynamics and defect formation as well as optimizing the process-related parameters of laser powder-bed fusion(L-PBF).However,its capabilities for being implemented as a reliable tool for material design,where minor changes in material-related parameters must be accurately captured,is still in *** the present research,first,a thermo-fluid computational fluid dynamics(CFD)model is developed and validated against experimental *** the predicted material properties of the pure Mg and commercial ZK60 and WE43 Mg alloys,parametric studies are done attempting to elucidate how the difference in some of the material properties,i.e.,saturated vapor pressure,viscosity,and solidification range,can influence the melt pool *** is found that a higher saturated vapor pressure,associated with the ZK60 alloy,leads to a deeper unstable keyhole,increasing the keyhole-induced porosity and evaporation mass *** viscosity and wider solidification range can increase the non-uniformity of temperature and velocity distribution on the keyhole walls,resulting in increased keyhole instability and formation of ***,the WE43 alloy showed the best behavior in terms of defect formation and evaporation mass loss,providing theoretical support to the extensive use of this alloy in *** summary,this study suggests an approach to investigate the effect of materials-related parameters on L-PBF melting and solidification,which can be extremely helpful for future design of new alloys suitable for L-PBF.

关键词： Mg alloys Laser powder-bed fusion(L-PBF) Melt pool dynamics Computational fluid dynamics Fluid flow

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Effect of gas blowing nozzle angle on multiphase flow and mass transfer during RH refining process

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 844-856页

作者： Jiahao Wang Peiyuan Ni Chao Chen mikael ersson Ying Li Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry School of MetallurgyNortheastern UniversityShenyang 110819China Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology School of MetallurgyNortheastern UniversityShenyang 110819China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm SE-10044Sweden

A three-dimensional mathematical model was developed to investigate the effect of gas blowing nozzle angles on multiphase flow,circulation flow rate,and mixing time during Ruhrstahl-Heraeus(RH) refining ***,a water model with a geometric scale of 1:4 from an industrial RH furnace of 260 t was built up,and measurements were carried out to validate the mathematical *** results show that,with a conventional gas blowing nozzle and the total gas flow rate of 40 L·min^(-1),the mixing time predicted by the mathematical model agrees well with the measured *** deviations between the model predictions and the measured values are in the range of about 1.3%–7.3% at the selected three monitoring locations,where the mixing time was defined as the required time when the dimensionless concentration is within 3% deviation from the bath averaged *** addition,the circulation flow rate was 9 kg·s^(-1).When the gas blowing nozzle was horizontally rotated by either 30° or 45°,the circulation flow rate was found to be increased by about 15% compared to a conventional nozzle,due to the rotational flow formed in the ***,the mixing time at the monitoring point 1,2,and 3 was shortened by around 21.3%,28.2%,and 12.3%,*** the nozzle angle of 30° and 45°,the averaged residence time of 128 bubbles in liquid was increased by around 33.3%.

关键词： Ruhrstahl-Heraeus refining gas blowing nozzle angle circulation flow rate mixing time multiphase flow

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Flow field, heat transfer and inclusion behavior in a round bloom mold under effect of a swirling flow submerged entry nozzle

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Journal of Iron and Steel Research International 2023年第6期30卷 1211-1221页

作者： Qing-hua Xie Pei-yuan Ni Toshihiro Tanaka mikael ersson Ying Li Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Graduate School of Engineering Osaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

Flow field,heat transfer and inclusion behavior in a 700 mm round bloom mold under the effect of a swirling flow submerged entry nozzle(SEN)were investigated with the aim to enhance the casting *** results indicate that the impinging flow phenomenon,which is commonly observed in conventional single-port SEN casting,was completely suppressed by the swirling flow SEN coming from a novel swirling flow generator design in *** from the SEN port moved towards the mold wall in 360 direction,leading to a uniform temperature distribution in the *** to a conventional single-port SEN casting,the steel super-heat was decreased by about 5 K at the mold center,and the temperature was increased by around 3.5 K near the *** addition,the removal ratio of inclusions to the mold top surface in the swirling flow SEN casting was found to be ***,the removal ratio of spherical inclusions with diameters of 1,10,50 and 100μm was increased by 18.2%,18.5%,22.6% and 42.7%,***,the ratio was raised by 18.2%,20.8%,21.5% and 44.1%for non-spherical inclusions,respectively.

关键词： Large round bloom Swirling flow submerged entry nozzle casting Flow field Heat transfer Inclusion behavior

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CFD study of non-premixed swirling burners: Effect of turbulence models

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1029-1038页

作者： Erfan Khodabandeh Hesam Moghadasi Mohsen Saffari Pour mikael ersson Par G.Jonsson Marc A.Rosen Alireza Rahbari Department of Mechanical Engineering Amirkabir University of TechnologyTehranIran School of Mechanical Engineering Department of Energy ConversionIran University of Sciesnce and Technology(IUST)Narmak 16846-13114TehranIran Department of Mechanical Engineering Shahid Bahonar University of KermanKermanIran Division of Processes Department of Materials Science and EngineeringKTH Royal Institute of TechnologyBrinellvägen 23SE-10044 StockholmSweden Faculty of Engineering and Applied Science University of Ontario Institute of TechnologyOshawaOntarioL1H 7K4Canada Department of Mechanical Engineering Shahid Rajaee Teacher Training University(SRTTU)TehranIran Research School of Engineering The Australian National UniversityCanberraACT 2601Australia

This research investigates a numerical simulation of swirling turbulent non-premixed *** effects on the combustion characteristics are examined with three turbulence models:namely as the Reynolds stress model,spectral turbulence analysis and Re-Normalization *** addition,the P-1 and discrete ordinate(DO)models are used to simulate the radiative heat transfer in this *** governing equations associated with the required boundary conditions are solved using the numerical *** accuracy of this model is validated with the published experimental data and the comparison elucidates that there is a reasonable agreement between the obtained values from this model and the corresponding experimental *** different models proposed in this research,the Reynolds stress model with the Probability Density Function(PDF)approach is more accurate(nearly up to 50%)than other turbulent models for a swirling flow *** the effect of radiative heat transfer model,it is observed that the discrete ordinate model is more precise than the P-1 model in anticipating the experimental *** model is able to simulate the subcritical nature of the isothermal flow as well as the size and shape of the internal recirculation induced by the swirl due to combustion.

关键词： Computational Fluid Dynamics(CFD) Turbulent combustion Non-premixed flames Large eddy simulations Radiative heat transfer model Modeling validation

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Mechanically Assisted Low-Temperature Pyrolysis of Hydrocarbons

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Energy and Power Engineering 2018年第4期10卷 133-153页

作者： Aliaksandr Yurievich Alevanau Oleksandr Ivanovych Vyhoniailo Olgerd Pavlovich Kuznechik Par Jonsson mikael ersson Efthymios Kantarelis Sintos Systems Svenska Filial NorsborgSweden Ukrnaphtohimsynthes LisichanskUkraine Observatory of Belarussian State University MinskBelarus School of Industrial Technology and Management KTHStockholmSweden Department of Material Science and Engineering KTHStockholmSweden Department of Chemistry KTHStockholmSweden

The focus of the study is experimental setups and conditions leading to pyrolysis (cracking) of such gaseous hydrocarbons as methane, mixed propane and butane, at the temperatures of the heater below 200°C. The process was mechanically assisted by putting the substances being decomposed into a dynamic interaction with the fractal interfaces of cracks in titanium dioxide films, as well as in tin and bismuth alloy. During a trial, the alloy was periodically heated and cooled so that it changed its phase state, and fractal interfaces were created between its surface and the gases. The interaction of the gases with fractal surfaces of the alloy being produced by mechanical fracturing made it possible to obtain gas cracking even at the lower temperatures of the heater (150°C). It should be noted that at this temperature, the heater couldn’t melt the alloy in the heated volume with the gas.

关键词： Pyrolysis Porosity Fractal Interfaces

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顶底复合吹炼过程中溶池内流体的流动情况

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现代冶金（内蒙古） 2008年第1期 19-25页

作者： mikael ersson[瑞典] 张怀军(译) 兰岳光(校)

为了探讨圆柱形溶池内的流场情况，分别研究了3种不同吹炼搅拌条件下的物理模型，3种喷吹工艺分别为：底吹搅拌、顶吹搅拌和顶底复合吹炼搅拌。采用粒子影像速度测量学（PIV）分析上述3种唼吹情况下的速度场。特别值得一提的是再循环区... 详细信息

为了探讨圆柱形溶池内的流场情况，分别研究了3种不同吹炼搅拌条件下的物理模型，3种喷吹工艺分别为：底吹搅拌、顶吹搅拌和顶底复合吹炼搅拌。采用粒子影像速度测量学（PIV）分析上述3种唼吹情况下的速度场。特别值得一提的是再循环区与底吹和复合吹炼情况下的流场相比，顶吹条件下产生的再循环区相对较小且靠近溶池表面。当提高底吹流速时，再循环区的中心向溶池内部移动；当采用顶底复合喷吹时，再循环区的中心随顶吹喷枪流速的增加而向溶池内部移动。

关键词：流体流动反应器底吹冲洗喷枪吹炼

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