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Numerical Simulation on Fluid Flow and Heat Transfer in Mold for Slab Continuous Casting

Author: WangCuiNa
Tutor: WenLiangYing
School: Chongqing University
Course: Metallurgical Engineering
Keywords: Slab mold Numerical Simulation Temperature field Flow field Inclusions
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 121
Quote: 0
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Abstract


In the continuous casting process , the mold is the molten steel forming the end of a process , crystallization within the flow characteristics of the molten steel is not only related to the heat transfer mold , inclusions floating slab surface and internal quality but also has a very a close relationship. Insight into and control the flow of steel in the mold liquid state and heat transfer behavior is an important condition to ensure efficient continuous casting process anterograde . In this study, heavy steel slab continuous casting mold for the prototype , based on the commercial software FLUENT operation platform , using the continuity equation , momentum equation and the energy equation to establish a three-dimensional mathematical model of the flow of molten steel mold simulation study of molten steel mold the current state and heat transfer behavior . Immersion nozzle (SEN) is studied by numerical simulation method structural parameters ( outlet angle, the shape of the bottom and the outlet outlet area ratio) and the continuous casting process parameters ( pulling speed , depth of insertion and blowing amount ) of steel in the mold of Flow Field and the impact of the temperature field analysis of the law of its impact and causes , and comparison with physical simulation to provide the basis for the optimization of the of SEN structure parameters and the continuous casting process parameters . Using a combination of the physical simulation experiments and numerical simulation methods , preferably slab mold outlet . Physical simulation results show that : the conventional smelting casting speed conditions under 160mm thickness mold B1 # B2 # outlet Jiaoyou ; to 190mm thickness mold # 2 and # 3 outlet Jiaoyou ; 230mm thickness of mold outlet # 2 and # 7 . superior. The numerical results show that : under the conditions of high casting speed , 160mm thickness mold the B2 # outlet Jiaoyou ; 190mm thickness crystallizer , # 2 outlet Jiaoyou ; the # 7 outlet Jiaoyou of the 230mm thickness of crystalline . By setting up and solving the equation of motion of the inclusions , the analysis of the trajectory of the inclusions in the mold . The results show that : the trajectory of the inclusions and the molten steel is similar to the flow diagram ; In the case of the other case is the same , the number of particle inclusions impact on the removal rate ; inclusions larger the diameter , the smaller the density , the more easily removed; inclusions near the submerged nozzle wall easily removed; when casting speed greater outlet insert a greater depth , a wide cross-section width of the mold , the impact of the liquid steel mold narrow face greater depth , inclusions is not easy floating , lower removal rate .

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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