液中超音波パルスを用いたオリフィスからの単一気泡発生法

  • 城田 農
    東京農工大学大学院工学教育部 九州大学大学院工学研究院
  • 今村 知大
    東京農工大学大学院工学教育部 凸版印刷 (株)
  • 亀田 正治
    東京農工大学大学院共生科学技術研究部

書誌事項

タイトル別名
  • Formation of Single Bubbles from a Submerged Orifice Using Pulsed Ultrasound Wave
  • エキ チュウ チョウオンパ パルス オ モチイタ オリフィス カラ ノ タンイツ キホウ ハッセイホウ

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抄録

A new experimental method to generate single small gas bubbles from a submerged orifice using pulsed ultrasound wave in a liquid is presented. Pulsed ultrasound wave having frequency of 15 kHz and maximum pressure amplitude of about 10 kPa is irradiated to a bubble growing from an orifice. Single air bubbles ranging from about 0.05 to 0.2 mm in radius are obtainable in silicone oil (kinematic viscosity : 1 mm2/s) using two orifices (0.02 and 0.04 mm in diameter), and by varying the timing to apply the pulse. Bubble deformation and detaching process was visualized and analyzed using both high-speed photography and direct numerical simulation. Consequently, it is revealed that bubbles are forced to elongate upward due to the oscillatory flow of gas through an orifice with high velocity, and the elongation causes the bubble to detach from an orifice. The sizes of bubbles at detachment can be well estimated with a common spherical bubble formation model.

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