Expansion of Injected Gas Bubble and Its Effects on Bath Mixing under Reduced Pressure.

  • Tatsuoka Teruhisa
    Graduate Student, Department of Materials Science and Engineering, Waseda University
  • Kamata Chizuna
    Graduate Student, Department of Materials Science and Engineering, Waseda University
  • Ito Kimihisa
    Department of Materials Science and Engineering, Waseda University

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The behavior of a single bubble was observed and the complete mixing time was measured under reduced pressure (∼1.33×102Pa (1 Torr)) using a silicon oil model. The bubble expanded greatly and changed from oval to a spherical-cup shape. The complete mixing time tended to be constant independent of the stirring power of gas per unit bath volume in the low vessel pressure range (<6.66×102Pa), because most of the expansion energy was dissipated and the mixing occurred near the bath surface; this was confirmed by observation of the flow.

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