Abstract
The purpose of this study is to discuss bubble-bubble interactions in a pair of zigzagging-ascend bubbles. For this specific purpose, a bubble generator that controlled the formation and launch of bubbles precisely was employed. The bubble's equivalent diameter was 2.68 mm. The two bubbles were launched and the initial bubble-bubble distance was 3.5, 4.0, 4.5, 5.0, 5.5 mm. The relative angle θ between the leading bubble and trailing bubble were set at 30°. Using a high speed video camera and PIV, we visualized motions of the bubbles and their surrounding liquid motion. The liquid motion induced by the trailing bubble was considered to enhance dynamic pressure acting on the leading bubble. The leading bubble took symmetrical-ellipsoidal shape, and symmetric property of the surrounding liquid motion has become stronger. As a result, a zigzag motion of the leading bubble was suppressed.
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