In order to increase the contact area and promote the mass transfer process of gas and liquid,the process of the bubble refine-ment in a metallurgical reactor with mechanical agitation was studied by physical simulati...In order to increase the contact area and promote the mass transfer process of gas and liquid,the process of the bubble refine-ment in a metallurgical reactor with mechanical agitation was studied by physical simulation.Based on the capillary number,a prediction equation for the bubble refinement was established.The effects of the gas flow rate,the stirring speed and thestirring depth on the bubble refinement in the reactor were discussed in detail.The distribution of the bubble diameter in thereactor was obtained under different conditions.The results show that when the stirring speed reaches 300 r/min,the bubblediamcter mainly distributes in the range of 1-2 mm.A higher gas flow rate may increase the number of bubbles in the meltand promote the bubble refinement process.The mechanism of bubble refinement under mechanical agitation was analyzed.and the results indicated that the stirring speed.,the blade area and the blade inclination are the main influencing factors.展开更多
Large bubbles seriously reduce the efficiencies of the interactions between the bubbles and the molten steel,such as energy transfer,momentum transfer,mass transfer and chemical reaction.To reduce the size of the bubb...Large bubbles seriously reduce the efficiencies of the interactions between the bubbles and the molten steel,such as energy transfer,momentum transfer,mass transfer and chemical reaction.To reduce the size of the bubbles and increase the gas–liquid interface area,a novel non-intrusive method of bubble refinement was proposed,which only depends on the molten steel flow field controlled by the rotating electromagnetic field.The flow fields of the molten steel for bubble refinement were analyzed,and the corresponding bubble refinement was investigated.It was found that the molten steel formed obvious rotating turbulent flow for bubble refinement under the unidirectional rotating electromagnetic field.However,the large vortex in the center of the molten pool caused by the rotating flow made the bubbles aggregate and coalesce again,resulting in formation of larger bubbles and gas cavity.To suppress the central vortex formation and enhance the bubble refinement,the forward-reverse rotating electromagnetic field for bubble refinement was proposed.The irregular and chaotic flow occurred repeatedly because of alternating forward and reverse rotating in a short period,so that the turbulent kinetic energy and turbulent dissipation of the flow field always remained at a high level which favors bubble refinement.As a result,the bubble diameter can decrease by more than 50%compared to that without electromagnetic field.Furthermore,it is important that this non-intrusive kind of bubble refinement method completely avoids the introduction of non-metallic inclusions caused by intrusive configuration.展开更多
基金supported by the National Natural Science Foundation of China(U1508217,U1702253 and 51774078)the Fundamental Research Funds for the Central Universities(N172506009 and N170908001).
文摘In order to increase the contact area and promote the mass transfer process of gas and liquid,the process of the bubble refine-ment in a metallurgical reactor with mechanical agitation was studied by physical simulation.Based on the capillary number,a prediction equation for the bubble refinement was established.The effects of the gas flow rate,the stirring speed and thestirring depth on the bubble refinement in the reactor were discussed in detail.The distribution of the bubble diameter in thereactor was obtained under different conditions.The results show that when the stirring speed reaches 300 r/min,the bubblediamcter mainly distributes in the range of 1-2 mm.A higher gas flow rate may increase the number of bubbles in the meltand promote the bubble refinement process.The mechanism of bubble refinement under mechanical agitation was analyzed.and the results indicated that the stirring speed.,the blade area and the blade inclination are the main influencing factors.
基金the National Natural Science Foundation of China(No.U1560207)the National Key R&D Program of China(No.2017YFB0304402)+1 种基金the Fundamental Research Funds for the Central Universities(No.N2125018 and No.N180915002)Liaoning Innovative Research Team in University(No.LT2017011).
文摘Large bubbles seriously reduce the efficiencies of the interactions between the bubbles and the molten steel,such as energy transfer,momentum transfer,mass transfer and chemical reaction.To reduce the size of the bubbles and increase the gas–liquid interface area,a novel non-intrusive method of bubble refinement was proposed,which only depends on the molten steel flow field controlled by the rotating electromagnetic field.The flow fields of the molten steel for bubble refinement were analyzed,and the corresponding bubble refinement was investigated.It was found that the molten steel formed obvious rotating turbulent flow for bubble refinement under the unidirectional rotating electromagnetic field.However,the large vortex in the center of the molten pool caused by the rotating flow made the bubbles aggregate and coalesce again,resulting in formation of larger bubbles and gas cavity.To suppress the central vortex formation and enhance the bubble refinement,the forward-reverse rotating electromagnetic field for bubble refinement was proposed.The irregular and chaotic flow occurred repeatedly because of alternating forward and reverse rotating in a short period,so that the turbulent kinetic energy and turbulent dissipation of the flow field always remained at a high level which favors bubble refinement.As a result,the bubble diameter can decrease by more than 50%compared to that without electromagnetic field.Furthermore,it is important that this non-intrusive kind of bubble refinement method completely avoids the introduction of non-metallic inclusions caused by intrusive configuration.
