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A generalized Multiple Size Group(MUSIG)model based on the Eulerian-Eulerian approach has been developed to describe the polydispersed bubbly flow inside the continuous-casting mold.The Eulerian-Eulerian approach is used to describe the equations of motion of the two-phase flow.Sato and Sekiguchi model is used to account for the bubble induced turbulence.Luo and Svendsen model and Prince and Blanch model are used to describe the bubbles breakup and coalescence behavior respectively.A laboratory scale mold has been simulated using four different turbulence closure models; with the purpose of critically comparing their predictions of bubble Sauter mean diameter distribution with previous experimental data.Furthermore,the influences of all the interfacial momentum transfer terms including drag force,lift force,virtual mass force,wall lubrication force,and turbulent dispersion force are investigated.The appropriate drag force coefficient,lift force coefficient,virtual mass force coefficient,turbulent dispersion force coefficient are chosen in accordance with measurements of water model experiments.Finally,the MUSIG model is then used to estimate the argon bubble diameter in the molten steel of the mold.The argon bubble Sauter mean diameter generated in molten steel is predicted to be larger than air bubbles in water for the similar conditions.