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Physical simulation of bubble refinement in bottom blowing process with mechanical agitation

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Abstract

In order to increase the contact area and promote the mass transfer process of gas and liquid, the process of the bubble refinement 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 the stirring depth on the bubble refinement in the reactor were discussed in detail. The distribution of the bubble diameter in the reactor was obtained under different conditions. The results show that when the stirring speed reaches 300 r/min, the bubble diameter mainly distributes in the range of 1–2 mm. A higher gas flow rate may increase the number of bubbles in the melt and 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.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (U1508217, U1702253 and 51774078) and the Fundamental Research Funds for the Central Universities (N172506009 and N170908001).

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Correspondence to Ting-an Zhang.

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Su, J., Dou, Z., Zhang, T. et al. Physical simulation of bubble refinement in bottom blowing process with mechanical agitation. J. Iron Steel Res. Int. (2020). https://doi.org/10.1007/s42243-020-00368-2

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Keywords

  • Physical simulation
  • Bottom blowing process
  • Mechanical agitation
  • Gas–liquid two-phase flow
  • Bubble refinement