Initially, the paper gives a survey on known theoretical models of mixing in gas-stirred melts. A new model that combines the concepts of the circulating concentration cloud and the two-tank model is presented. In this model, the combined effect of recirculation flow and turbulent mixing is expressed by a number of ideally mixed tanks in series. The tanks in series are additionally connected with a dead volume according to the two-tank model. In total, the model contains four characteristic parameters. The results of numerical calculations using the model are compared with experimental data of mixing in a water model and in a 40 t steel ladle both with centric gas-stirring.
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Mietz et al. (1987) studied this question.
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