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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

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Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v27.i1.30
pages 51-66

EXPERIMENTAL INVESTIGATION OF THE MOTION OF A PAIR OF BUBBLES AT INTERMEDIATE REYNOLDS NUMBERS

Hiroaki Kusuno
Shizuoka University, Graduate School of Engineering, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
Toshiyoki Sanada
Shizuoka University, Faculty of Engineering, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan

Краткое описание

For the problem of bubble-bubble interaction at intermediate Reynolds numbers, some theoretical models and direct numerical simulation results are available; however, experimental verifications are lacking. In this study, we observed the motion of a pair of bubbles, produced by an originally developed bubble generator, interacting in-line. The Reynolds numbers of the target bubbles ranged from 50 to 300. The bubble motions were observed using two high-speed video cameras, and their diameters were measured by a high-resolution digital still camera. Initially, the lift force acts on the trailing bubble owing to the wake of the leading bubble; the lift force causes the trailing bubble to deviate from the vertical line to the leading bubble. The potential interaction then becomes dominant. Finally, the trailing bubble approaches the leading bubble. This motion is completely different from the particles motion in which the trailing particle is drafted toward the wake region of the leading particle. In addition, it is shown that a slight difference in the diameter of the bubbles drastically changes their interaction.

Ключевые слова: bubble-bubble interaction, wake, lift force

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