期刊
JOURNAL OF FLUID MECHANICS
卷 647, 期 -, 页码 143-161出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112009993077
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资金
- Deutsche Forschungsgemeinschaft (DFG)
The influence of Marangoni stresses, caused by contaminants adsorbed on the surface of small air bubbles, rising in water, is examined by numerical simulations. A modified level set method is used to represent the deformable bubble interface, extended by a model for the contaminant transport on the bubble surface. We show that surface tension variations of less than 2 % are sufficient to generate Marangoni stresses that are strong enough to change the rising characteristics of a bubble to that of a corresponding solid particle. In such situations, we find that the bubble surface is fully covered with contaminant and the shear stress profile resembles the shear stress profile around a solid sphere.
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