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An antibubble, the counterpart of an ordinary bubble, consists of a liquid drop separated from the bulk liquid by a thin film of gas, where understanding of its formation mechanism remains limited. Four criteria are reported for antibubble formation by drop pairs impinging on a free surface based on scaling analysis and experimental characterization. This work not only elucidates the underlying formation physics of antibubbles, but it also provides useful guidelines to control antibubble generation.
Song et al. (Fri,) studied this question.
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