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| 1 | Study and Application of Mold Filling Simulation of Shaped Castings显示文摘In this paper, an algorithm for simulating fluid flow and heat transfer for mold filling of shaped castings is presented. The main features of the algorithm include: 1) a simple but practical technique based on VOF method to determine free surface, 2) an explicit scheme of enthalpy to solve the energy equation more efficiently, and 3) an effective treatment to modify the flux deviation due to pressure iteration. In order to verify these methods, well controlled experiments have been repeatedly done with both water analog and gray iron pouring experiments to record the flow patterns and temperature variations. The calculated results are in accordance with the experimental ones. For the applications, the simulated initial temperature distribution right after mold filling was used to analyse subsequent solidification and to predict shrinkage defects.Actual castings were poured and tested in a foundry plant. The reuslts show that the defects predication with considering fluid flow effects is more precise than that without considering the effects. | Baicheng LIU Wei QIU Houfa SHEN Zhiqiang GAO (Dept. of Mechanical Engineering, Tsinghua University Beijing 100084, China) | 1997 | Journal of Materials Science & Technology1997，13，2： | 5 |
| 2 | Numerical simulation on multiple pouring process for a 292 t steel ingot显示文摘A ladle-tundish-mould transportation model considering the entire multiple pouring(MP) process is proposed. Numerical simulation is carried out to study the carbon distribution and variation in both the tundish and the mould for making a 292 t steel ingot. Firstly, the fluid flow as well as the heat and mass transfer of the molten steel in the tundish is simulated based on the multiphase transient turbulence model. Then, the carbon mixing in the mould is calculated by using the species concentration at the tundish outlet as the inlet condition during the teeming process. The results show a high concentration of carbon at the bottom and a low concentration of carbon at the top of the mould after a MP process with carbon content high in the first ladle and low in the last ladle. Such carbon concentration distribution would help reduce the negative segregation at the bottom and the positive segregation at the top of the solidified ingot. | Tu Wutao Zhang Xiong Shen Houfa Liu Baicheng | 2014 | China Foundry2014，11，1： | 4 |
| 3 | Analysis of solute redistribution and centerline segregation in continuously cast thin slab显示文摘1 .Introduction Macro-segregation is induced by the solute redistributionnear the solidification interface and it is affected by thefluid flow in the mushy zone. Centerline segregation oftenformed in continuous casting strands along the castingdirection, so the property uniformity of products isseverely destroyed. | Changwen MA, ~*Houfa SHEN, Tianyou HUANG, Baicheng LIU (Department of Mechanical Engineering, Tsinghua University, Beijing iooo84, P. R. China) | 2004 | China Foundry2004，1，2： | 2 |
| 4 | Modeling of Mold Filling and Solidification in Lost Foam Casting显示文摘Based on the characteristics of the lost foam casting (LFC) and the artificial neural network technique, a mathematicalmodel for the simulation of the melt-pattern interface movement during the mold filling of LFC has been proposed andexperimentally verified. The simulation results are consistent with the experiments in both the shapes of melt frontand filling sequences. According to the calculated interface locations, the fluid flow and the temperature distributionsduring the mold filling and solidification processes were calculated, and the shrinkage defect of a lost foam ductileiron casting was predicted by considering the mold wall movement in LFC. The simulation method was applied tooptimize the casting design of lost foam ductile iron castings. It is shown that the model can be used for the defectsprediction and for casting design optimization in the practical LFC production. | Fengjun LI, Houfa SHEN and Baicheng LIUDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China | 2003 | Journal of Materials Science & Technology2003，19，5： | 1 |
| 5 | A response to numerical benchmark for solidification of binary alloys: macro-segregation with thermo-solutal convection显示文摘As a necessary step toward the quantitative predictions of macro-segregation commonly found in metal castings,classical experiments and numerical benchmarks have been used to validate a simplified binary- alloy solidification model.The model consists of fully coupled conservation equations for the transport phenomena (heat transfer,solute redistribution,and melt convection)that lead to macro-segregation in a solidifying ingot with a fixed solid phase.Simulations were performed for solidification of either a Pb-48wt.%Sn or a Sn-5wt.%Pb alloy in a rectangular cavity.The present predictions were compared with experimental data and numerical reference results reported in the literature.Subsequently,the model was applied to a numerical benchmark problem described in the literature for solidification of a Sn-10wt.%Pb alloy.Simulation results for flow velocity,liquid fraction evolution,and macro-segregation maps also were compared with literature predictions,showing similar trends.It is concluded that additional comparisons to experimental results are still required to assess more complex solidification models. | Li Wensheng Shen Houfa Liu Baicheng | 2012 | China Foundry2012，9，2： | 1 |
| 6 | Instabili- ty of fluid flow and level fluctuation in continuous thin slab casting mould显示文摘 | Shen Bingzhen Shen Houfa Liu Baicheng | 2007 | ISIJ Int2007，47，3： | 1 |
| 7 | Instability of fluid flow and level fluctuation in continuous thin slab casting mould显示文摘 | SHEN Bingzhen SHEN Houfa LIU Baicheng | 2007 | ISIJ International2007，47，3： | 1 |
| 8 | Instability of fluid flow and level fluctuation in continuous thin slab casting mould显示文摘 | Bingzhen SHEN Houfa SHEN Baicheng LIU | 2007 | ISIJ Int2007，47，3： | 1 |
| 9 | Modelling of Level Fluctuation in Continuous Casting显示文摘The free surface profile and fluid flow in the mold of continuous casting have been calculated by the VOF method couplingthe SIMPLER algorithm. The SIMPLER-VOF model developed is validated by solving a classical experiment, broken damproblem. The calculated surface profile is consistent with water modelling. It is found that the free surface profile is coherentlyrelated to the position of circumfluence in the mold of continuous casting. With the increase of nozzle port inclination, thepositive vortex above the jet is near to the meniscus and the level fluctuation becomes prominent. | Xiao LIU Huanxin ZHANG Rongjun XU Yongquan LI Houfa SHEN Baicheng LIU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
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