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Effects of pore diameter, bath surface pressure, and nozzle diameter on the bubble formation from a porous nozzle

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Abstract

The effects of the pore diameter, bath surface pressure, and nozzle diameter on the bubble formation from a porous bottom nozzle placed in a water bath and on the behavior of rising bubbles were investigated with still and high-speed video cameras and a two-needle electroresistivity probe. Three types of bubble dispersion patterns were observed with respect to gas flow rate, and they were named the low, medium, and high gas flow rate regimes. The transition boundaries between these gas flow rate regimes were expressed in terms of the superficial velocity at the nozzle exit, i.e., the volumetric gas flow rate per unit nozzle surface area. These transition boundaries were dependent on the pore diameter but hardly dependent on the bath surface pressure and the porous nozzle diameter. The characteristics of rising bubbles in each gas flow rate regime were investigated as functions of the three parameters.

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Authors and Affiliations

  1. the Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, 060-8628, Sapporo, Japan

    Manabu Iguchi (Professor)

  2. the Department of Mechanical Engineering, School of Bio-Oriented Science and Technology, Kinki University, 649-6493, Wakayama, Japan

    Masuo Kaji (Professor)

  3. Department of Materials Science and Processing, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan

    Zen-Ichiro Morita (Professor Emeritus, Advisor)

  4. Sumitomo Metal Industries Ltd., 660, Hyogo, Japan

    Zen-Ichiro Morita (Professor Emeritus, Advisor)

Authors
  1. Manabu Iguchi
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  2. Masuo Kaji
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  3. Zen-Ichiro Morita
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Iguchi, M., Kaji, M. & Morita, ZI. Effects of pore diameter, bath surface pressure, and nozzle diameter on the bubble formation from a porous nozzle. Metall Mater Trans B 29, 1209–1218 (1998). https://doi.org/10.1007/s11663-998-0043-9

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  • DOI: https://doi.org/10.1007/s11663-998-0043-9

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