| KR stirring and Jet stirring are usually used in hot-metal pretreatment process. At present,there is few studies regarding KR stirring and jet stirring, and mainly limited toexperimental studies. There is even fewer numerical studies on the dynamics of hot-metalpretreatment. Therefore, this paper carries out numerical simulation and investigatesdynamics of KR stirring and Jet stirring in hot-metal pretreatment. The study will help toimprove the efficiency of hot-metal pretreatment.The dynamics of KR stirring and jet stirring are studied through a numerical approach. InKR stirring flow, the evolution of free surface and the effects of bubble dynamics duringjet stirring are investigated. In KR stirring, the rotating of stirrer generates shear flow andvortex flow, and the flow field is stirred. In the numerical simulation, the VOF and movingmesh method are used to solve for the KR stirring flow and capture the free surface. Onthe other hand, the evolution of bubble is studied. The gas-liquid interface is successfullycaptured.Finally, the flow field and free surface evolution in KR stirring are studied with differentstructural sizes and working conditions. The numerical results agree well with those ofexperiments from Research and Development Institute of Wuhan Iron&Steel Corp.. Theresults show that the numerical methods and models in this paper are feasible in studyingthe dynamics of KR stirring and jet stirring. The free surface evolution in KR stirring isrelated to the structural size and working conditions. The study of let stirring demonstratesthat the dynamics of gas bubbles can stir the hot metal flow field. The numerical study inthis paper can help the optimization of stirrer structural design and working parameters. |
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