1608 並列上昇二気泡の衝突時における気泡挙動と周囲液相運動(2)(OS16-2 混相流の光応用計測,OS16 混相流の光応用計測,オーガナイズドセッション)

概要

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Various behavior of a pair of bubbles rising side by side was experimentally investigated. The behavior of the pair of bubbles was visualized using LEDs and a high-speed video camera. In addition, its surrounding liquid motion at the time of collision was visualized via PIV method. A recursive cross correlation method was used as PIV algorithm. The pair of bubbles was generated simultaneously from a pair of needles using two audio speakers. The bubble is 3.06 mm in equivalent diameter, and the bubbles ascended zigzag. As a result, the bubble horizontal velocity after the collision was different from that in the case of no collision. This phenomenon is caused by the rapid change of the surrounding liquid motion especially right after collision. Between the two bubbles, the liquid velocity becomes so high that the pressure becomes low. Therefore, the horizontal velocity is decreased by lift force generated from the difference of the pressure near of the bubbles.
一般社団法人日本機械学会の論文
2006-10-28