Dynamics of an initially spherical bubble rising in quiescent liquid
Dynamics of an initially spherical bubble rising in quiescent liquid
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DOI：
10.1038/ncomms7268
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发表时间：
2015-02
影响因子：
16.6
通讯作者：
M. Tripathi;K. Sahu;R. Govindarajan
中科院分区：
文献类型：
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作者：
M. Tripathi;K. Sahu;R. Govindarajan
几个世纪以来，液体中上升的气泡的形状和动力学的美丽和复杂性一直让科学家们着迷。在这里，我们执行模拟的初始球形气泡从休息开始。我们报告说，动态是完全三维的，并提供了一个广泛的画布的行为模式。我们的相图在伽利略-Eötvös平面显示了五个不同的制度，明确界定的边界。发现两个非对称性损失制度：一个轻微的不对称性限制在一个扑裙;和另一个显着的形状演变。大的形状不对称性和路径不稳定性之间建立了完美的相关性。在对应于周边破碎和环形形成的制度，动力学是不稳定的。在低莫顿数时，发现了一种新的分裂，分裂成一个灯泡形的气泡和一些卫星滴。调查结果具有根本和实际意义。我们希望实验者能有动力来检验我们的预测。
The beauty and complexity of the shapes and dynamics of bubbles rising in liquid have fascinated scientists for centuries. Here we perform simulations on an initially spherical bubble starting from rest. We report that the dynamics is fully three-dimensional, and provide a broad canvas of behaviour patterns. Our phase plot in the Galilei–Eötvös plane shows five distinct regimes with sharply defined boundaries. Two symmetry-loss regimes are found: one with minor asymmetry restricted to a flapping skirt; and another with marked shape evolution. A perfect correlation between large shape asymmetry and path instability is established. In regimes corresponding to peripheral breakup and toroid formation, the dynamics is unsteady. A new kind of breakup, into a bulb-shaped bubble and a few satellite drops is found at low Morton numbers. The findings are of fundamental and practical relevance. It is hoped that experimenters will be motivated to check our predictions.