Behavior of Fine Bubbles in Front of the Solidifying Interface

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著者

    • WANG Zhe
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
    • MUKAI Kusuhiro
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
    • LEE In Jae
    • Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology

抄録

In front of the solidifying interface, the solidifying boundary layer plays an important role in determining whether foreign particles could be engulfed or not by the solidifying interface. In this study, we have investigated how the boundary layer influences the behavior of the foreign particles by directly observing the behavior of fine bubbles in front of a vertical solidifying interface of the water solution. In the case of surfactant (C<sub>8</sub>H<sub>17</sub>SO<sub>3</sub>Na) water solution, bubbles in the vicinity of the solidifying interface were found to move horizontally toward the solidifying interface, and then were engulfed by it. However, this phenomenon was not observed in the case of NaCl water solution. <br>Analysis indicated that inside the boundary layer with a surfactant concentration gradient, a surface tension gradient around the interface of the bubble and the solution was formed. We have concluded that the surface tension gradient generates a driving force on the bubble, causing the bubble to move towards the solidifying interface. Experimental results were found to be well in accord with theoretical analysis.

収録刊行物

  • ISIJ international

    ISIJ international 39(6), 553-562, 1999-06-15

    The Iron and Steel Institute of Japan

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