Kabakov D. Three-dimensional mathematical model of hydrodynamics and heat transfer in gas-liquid continuum in a ladle-furnace while a melted steel is being processed

Kabakov D. U. "Three-dimensional mathematical model of hydrodynamics and heat transfer in gas-liquid continuum in a ladle-furnace while a melted steel is being processed". - Manuscript. Dissertation on the competition of graduate degree of Candidate of Engineering sciences, specialty 01.05.02 - Mathematical design and calculable methods. National metallurgical academy of Ukraine, Dnipropetrovsk, 2014. The results of theoretical researches of hydrodynamic and heat-transfer process-es in multi-phase continuum, that have place while a melted steel is being processed in a ladle-furnace, are presented to defense. The three-dimensional mathematical model of conjugate hydrodynamics and heat transfer processes of melted steel in ladle-furnace was built. Three-dimensionality allows to take into consideration the detailed geometry of a ladle and to investigate such processes, as differential blowing through a few tuyeres or blowing through tuy-eres that are rotating. The model is generalized to the case of effective-compressibility; this kind of approximation gives opportunity to take into account the compressibility of the gas phase and of the continuum itself. Based on the model, new mathematical model of transfer, dissolution and ho-mogenization of the powdered graphite, which is blown into the melt, while it is being processed in a ladle-furnace, was built. With the use of the model next practical problems were solved: " the time of homogenization of the melt composition after injection of the powdered graphite on the two different metallurgical installations, that are exploited on the "PJSC Dneprovsky Integrated Iron&Steel Works named af-ter Dzershinsky"; " optimal values of variable factors, that provide the minimization of parame-ters, which characterize heat state of the melted steel and improve the effi-ciency of its mixing on "PJSC Electrometallurgical works Dneprospetsstal named after A.N.Kuzmin".