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Analysis model of internal residence time distribution for fluid flow in a multi-strand continuous casting tundish

Journal of Iron and Steel Research International 2024年第9期31卷 2186-2195页

作者： qiang yue yue Li Zi-ming Wang Ben-chen Sun Xiu-zhen Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina School of Mechanical Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina

The external residence time distribution(RTD)curve is extensively used to characterise fluid flow within the single-strand continuous casting *** volume fraction determination typically relies on the external RTD curve to reveal macroscopic fluid flow *** on the external RTD to effectively assess dead volume fractions and other fluid characteristics under conditions of internal non-uniform flow,an internal RTD was *** a smooth pipe under laminar flow conditions,the dead region occupies 25%of the total volume,which is defined as the space between the pipe wall and a radius of 0.866 R0(where R0 is the radius of pipe).Under turbulent flow conditions,the dead region only occupies 0.38%of the reactor’s internal volume,spanning from the pipe wall to a radius of 0.00189 *** results obtained using the external RTD method are consistent with the theoretical *** trials involving water were conducted to examine the flow of molten steel within a five-strand ***,an analysis approach employing internal RTD was employed to evaluate fluid mixing within a multi-flow continuous casting *** the internal RTD method,the analysis revealed that the whole dead zone volume fraction of the intermediate package decreased from 26.9%to 18.9%after the addition of the flow control *** dead volume fraction can be accurately depicted by utilising the internal mean RTD *** association between the internal RTD function and the external average RTD can be effectively employed to scrutinise the response curve of the tracer within a system exhibiting uneven flow distribution.

关键词： Tundish Internal residence time distribution Dead volume Critical velocity Mathematical modelling

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Solving Generalized Non-degenerate Two-Mode Two-Photon Jaynes-Cummings Model by Supersymmetric Unitary Transformation

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Communications in Theoretical Physics 2002年第7期38卷 85-88页

作者： SONG Tong-qiang ZHU yue-Jin Department of Physics Ningbo University Ningbo 315211 China Department of Physics Ningbo University Ningbo 315211 China

Based on supersymmetric quantum mechanics theory, we introduced a supersymmetric unitary transfor mation to diagonalize the Hamiltonian of non-degenerate two-mode two-photon Jaynes-Cummings models which include any forms of intensity-dependent coupling, field-dependent detuning, and field nonlinearity. Its eigenvalue, eigenstates,and time evolution of state vector are obtained.

关键词： supersymmetric unitary transformation, Jaynes-Cumnings model

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Some New Exact Solutions of mKdV Equations

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Communications in Theoretical Physics 2006年第5期45卷 790-792页

作者： GONG Lun-Xun ZHENG qiang yue Ping School of Science Guizhou Normal University Guiyang 550001 China

New exact solutions are determined to the coupled mKdV equations by means of modified mapping method.

关键词： mKdV equations modified mapping method traveling wave solutions

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Some Problems of Recycling Industrial Materials

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Journal of Iron and Steel Research International 2008年第5期15卷 37-41,55页

作者： CAI Jiu-ju LU Zhong-wu yue qiang SEPA Key Laboratory on Eco-Industry Northeastern University Shenyang 110004 Liaoning China

The industrial system should learn from the natural ecosystem. The resource utilization efficiency should be increased and the environmental load should be decreased, depending on the materials recycled in the system. The classification of industrial materials from the viewpoint of large-scale recycling was stated. Recycling of materials, on three different levels, was introduced in the industrial system. The metal flow diagram in the life cycle of products, in the case of no materials recycled, materials partially recycled, and materials completely recycled, was given. The natural resource conservation and the waste emission reduction were analyzed under the condition of materials completely recycled. The expressions for the relation between resource efficiency and material recycling rate, and the relation between eco-efficiency and material recycling rate were derived, and the curves describing the relationship between them were protracted. The diagram of iron flow in the life cycle of iron and steel products in China, in 2001, was given, and the iron resource efficiency, material recycling rate, and iron eco-efficiency were analyzed. The variation of iron resource efficiency with the material recycling rate was analyzed for two different production ratios.

关键词： recycling industrial material product life cycle resource efficiency eco-efficiency material recycling rate

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Visible-Light-Catalyzed Phosphonation-Annulation： An Efficient Strategyto Synthesize β-Phosphonopyrrolidines and β-Phosphonolactones

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Chinese Journal of Chemistry 2018年第11期36卷 1052-1058页

作者： Chong Li Zhi-Chao Qi qiang Yang Xiao-yue qiang Shang-Dong Yang State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou Gansu 730000 China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences LanzhouGansu 730000 China

A new type of phosphine radical precursor for C—P bond formation has been developed and successfully used in visible‐light‐catalyzed phosphonation‐annulation of unsaturated sulfonamides and carboxylic acids. The catalytic process is simple and green accessible, and no additional oxidant or base is needed. Mechanistic studies suggest that the reaction proceeds via a single electron transfer pathway.

关键词： phosphanes heterocycles annulation photocatalysis radicals

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Water Modeling of Swirling Flow Tundish for Steel Continuous Casting

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Journal of Iron and Steel Research International 2009年第5期16卷 17-22页

作者： yue qiang ZOU Zong-shu HOU Qin-fu CHEN Zhou School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China School of Materials Science and Engineering University of New South Wales Sydney NSW2052 Australia

A conventional turbulence inhibitor is compared with a swirling chamber from the points of view of fluid flow and removal rate of inclusion in the tundish. Comparing the RTD curves, inclusion removals, and the streamlines in water model experiments, it can be found that the tundish equipped with a swirling chamber has a great effect on improving the flow field, and the floatation rate of inclusion is higher than the tundish with a turbulence inhibitor. Because of the introduction of the swirling chamber, the flow field and inclusion removal in a two-strand swirling flow tundish are asymmetrical. Rotating the inlet direction of swirling chamber 60 degree is a good strategy to improve the asymmetrical flow field.

关键词： water model experiment flow field swirling chamber inclusion removal continuous casting tundish

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Aggregation Kinetics of Inclusions in Swirling Flow Tundish for Continuous Casting

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Journal of Iron and Steel Research International 2010年第5期17卷 6-10页

作者： yue qiang ZOU Zong-shu HOU Qin-fu School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

The mechanism of inclusion aggregation in liquid steel in swirling flow tundish is analyzed by applying the theory of flocculation which was developed in the field of colloid engineering. The gas bridge forces due to the micro bubbles on hydrophobic inclusion surfaces were responsible for the inclusion collision and agglomeration, which can avoid the aggregation to breakup. The quantity of micro bubbles on hydrophobic inclusion particle is more than that on hydrophilic one. The trend of forming gas bridges between micro bubbles on particles is strong in the course of collision. The liquid film on hydrophobic particles is easy to break during collision process. Hydrophobic particles are liable to aggregate in collision. According to the analysis of forces on a nonmetallic inclusion particle in swirling chamber, the chance of inclusion collision and aggregation can be improved by the centripetal force. Hydropbobic particles in water are liable to aggregate in collision. Hydrophilic particles in water are dispersed although collision happens. The wettability can be changed by changing solid-liquid interface tension. The nonmetallic inclusion removal in swirling flow tundish is studied. The result shows that under certain turbulent conditions, *** concentration and the wettability between particles and liquid steel are the main factors to induce collision and aggregation.

关键词： collision aggregation wettability inclusion swirling chamber continuous casting tundish

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Visualization of collision and aggregation behavior of particles simulating movement of inclusions in molten steel

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Journal of Iron and Steel Research International 2018年第2期25卷 173-180页

作者： qiang yue Zeng Hu Zhao-yang Wu Hong-ming Long Qing-min Meng Key Laboratory of Metallurgical Emission Reductionand Resources Recycling (Anhui University of Technology) Ministry of Education Ma'anshan 243002 Anhui China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081 Hubei China School of Metallurgical Engineering Anhui Universityof Technology Ma'anshan 243002 Anhui China

Inclusions with sizes less than 1 μm in molten steel are difficult to float up to the molten steel and slag interface owing to their slow terminal velocity. Thus, increasing the size of inclusion is essential for accelerating the removal of inclusions. Polystyrene particles simulating inclusions in molten steel were quantified by direct observation of the particle collision behavior in a turbulent flow in a water model. The box-counting fractal dimension of particles was calculated by processing the binary images of aggregated particles. The fractal dimension of the outer contours of the single plastic particles was smaller than that of the aggregated particles. The fractal dimension was varied from 1.14 to 1.35. When two or more monomer particles collide, the aggregates are separated more easily, as the temperature increases from 40 to 80 ℃. The aggregated particles were loose and easy to separate in the high-temperature aqueous solution. The effect of temperature on the surface tension of liquid and the interracial tension of solid and liquid is obvious. The particles are wetting in the water solution at a temperature more than 60 ℃. The relationship between the velocity of the particles and the fractal dimension of the solid particles with the equivalent diameter was discussed.

关键词： Non-metallic inclusion Fractal Box-counting dimension Visualization Collision. Aggregation

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Enhanced solutions for resource conflict in GMPLS controlled optical network

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The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 123-127页

作者： HUANG Zhi-tong HUA Yi-qiang LU yue-ming JI yue-feng, XU Da-xiong Key Laboratory of Optical Communications and Lightwave Technologies Beijing University of Posts and Telecommunications Beijing 100876 China

This article discusses the issue of resource conflict in the generalized multi-protocol label switching （GMPLS） controlled optical network. Based on the analysis of the current random rebuilding mechanism and its drawbacks, this article presents two enhanced solutions for improvement, namely, the priority-based resource allocation mechanism and the network management system （NMS） based sequential resource allocation mechanism. Experimental results show that the presented mechanisms perform better than the original random rebuilding solution in terms of the connection setup/recovery time and successful rate.

关键词： GMPLS automatically switched optical network (ASON) resource reservation protocol (RSVP) control plane resource conflict

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Effects of microstructures on mechanical properties of Ti-63 titanium alloy

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Rare Metals 2009年第6期28卷 533-536页

作者： yue qiang LIU Yuqin WANG Dingchun WANG Xizhe CHU Maoyoua SHEN Jianyun Mining Metallurgy ＆ Materials Research Department General Research Institute for Nonferrous Metals Beijing 100088 China School of Materials Science and Technology China University ofGeosciences Beijing 100083 China Baoji Titanium Industry Co. Ltd. Baoji 721014 China

The microstructure and mechanical properties of Ti-63 pancakes were investigated under different heat-treatment modes. Pancake No. 1, with an as-forged bimodal structure, was β annealed at 930℃ for l h. Its structure was changed to a Widmanstatten structure with continuous grain boundary α phase and long lamellar α phase. The pancake showed a good combination of strength, ductility and fracture toughness. Pancake No. 2, with an as-forged bimodal structure, was aged at 540℃for 8 h after annealing at 930℃ for 1 h. Other than the t＇me secondary α precipitates, it showed a similar microstructure to that of pancake No. 1. The fine precipitates can enhance the pancake＇s strength while reducing the ductility and fracture toughness. Pancake No. 3, with an as-forged basket-weave structure, was annealed at 750℃ for 1 h. Its structure was nearly unchanged and it achieved a better ductility but a slightly lower fracture toughness than pancake No. 1.

关键词： titanium alloys microstructure heat treatment mechanical properties

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