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Multi-Scale Numerical Simulation of Flow,Heat and Mass Transfer Behaviors in Dense Gas-Solid Flows:A Brief Review

Journal of Thermal Science 2022年第3期31卷 607-633页

作者： HE Yurong REN Anxing TANG Tianqi WANG Tianyu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China Heilongjiang Key Laboratory of New Energy Storage Materials and Processes School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin150001China

Dense gas-solid flows are very common in actual production and industrial fields,so it is significant to understand their hydrodynamic characteristics and heat and mass transfer *** article provides a brief review of multi-scale numerical simulation of flow,heat and mass transfer behaviors in dense gas-solid *** describes multiscale models(direct numerical simulation,discrete particle model,and two-fluid model)and the results of related ***,it discusses possible future developments in research on the flow,heat and mass transfer characteristics of dense gas-solid two-phase flows.

关键词： gas-solid flows multi-scale modeling direct numerical simulation discrete particle model two-fluid model heat and mass transfer

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Physical and numerical investigation on fluid flow and inclusion removal behavior in a single-strand tundish

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Journal of Iron and Steel Research International 2023年第6期30卷 1182-1198页

作者： Qi Quan Zhi-xiao Zhang Tian-peng Qu Xiang-long Li Jun Tian De-yong Wang School of Iron and Steel Soochow UniversitySuzhou 215137JiangsuChina

Aiming at the problem that the existence of inclusions in the tundish continuous casting process can easily lead to quality defects of the slab,the stainless steel continuous casting tundish was taken as the research *** effects of flow control device,inclusion density and inclusion size on the mixing characteristics of molten steel and inclusion behavior in tundish were *** results showed that compared with the tundish without flow control device,the average residence time of molten steel was prolonged by about 49 s,the dead zone volume fraction was reduced by 8.93%,and the piston fluid integral rate was increased by 12.68%.In the turbulence inhibitor(TI)tundish with weir-dam combination,the removal rate of inclusions with a density of 2700 kg m^(-3) and a particle size of 5 lm is 63.32%,while the removal rate of large inclusions with a density of 150μm could reach 89.04%.When the inclusion particle size was 10-50μm and the density was 2700-4500 kg m^(-3),the effect of inclusion density on inclusion removal rate was *** the same time,when weir-dam combination TI tundish was set,the inclusions were mainly limited to the slag-metal interface of the first and second chambers of the *** removal rate of inclusions in the first chamber was generally improved,with 10μm inclusions accounting for 47.67% and 150μm inclusions accounting for 60.69%.Furthermore,it has the best effect on the removal of small-size inclusions,especially those less than 70μm.

关键词： Non-metallic inclusion Flow control device Residence time distribution curve Removal behavior discrete particle model

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Numerical simulation of fluid flow and alloy melting in RH process for electrical steels

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Journal of Iron and Steel Research International 2022年第9期29卷 1423-1433页

作者： Haijun Wang Rui Xu Hai-tao Ling Wei Zhong Li-zhong Chang Sheng-tao Qiu Anhui Province Key Laboratory of Metallurgical Engineering and Resources Reeyeling Anhui University of TechnologyMa'anshan 243002AnhuiChina School of Metalurgical Engineering Anhui University of Technology.Ma'anshan 243002AnhuiChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Xinyu Iron and Steel Co. Ltd.Xinyu 338001JiangxiChina National Engineering and Research Centerfor Continuous Casting Technology Central Iron and Steel Research InstituteBeijing 100081China

Based on the Eulerian-Lagrangian approach,a mathematical model was established to describe the gas-liquid flow behavior in the Ruhrstahl-Heraeus(RH)*** momentum source and the turbulent kinetic energy source due to the motion of gas bubbles were considered for the liquid *** effect of the expansion of gas bubbles on the liquid velocity,recirculation rate,and mixing time was quantitatively *** the fluid flow reached the steady state,the melting and mixing processes of aluminum alloys in the RH degasser were also *** results indicate that the expansion of gas bubbles has a significant infuence on the recirculation rate and the mixing time in the RH *** the superheat of liquid steel and decreasing the initial diameter of alloy particles are beneficial to promote the melting and mixing of alloy *** to the existence of solidified steel shells,the maximum diameter of the alloy particle is about 1.5 times its initial diameter.

关键词： discrete particle model Multiphase flow Gas expansion-Mixing time Alloy melting Numerical simulation

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MATHEMATICAL modelS AND NUMERICAL SIMULATION FOR DENSE PARTICULATE FLOWS

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Journal of Hydrodynamics 2004年第6期16卷 777-777页

作者： WUChun-liang DepartmentofAppliedMechanicsandEngineering ZhongshanUniversityGuangzhou510275China

Sedimentation of particles in inclined and vertical vessels is numerically simulated by the Eulerian two-fluid model. The numerical results show an interesting phenomenon with two circulation vortexes in a vertical vessel but one in the inclined vessel. Sensitivity tests indicate that the boundary layer effect is the key to induce this phenomenon. A numerical method based on 2D unstructured meshes is presented to solve the hard-sphere discrete particle model. Several applications show the numerical method has a good performance to simulate dense particulate flows in irregular domains without regard to element types of the mesh.

关键词： dense particulate flow Eulerian two-fluid model discrete particle model unstructured grids

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