Asymmetric deformation of bubble shape: cause or effect of vortex-shedding?

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• 作者：Kamil Wichterle ; Marek Ve?e? ; Marek C. R??i?ka
• 关键词：bubble ; bubble shape ; bubble velocity ; bubble oscillation ; surface tension
• 刊名：Chemical Papers
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：68
• 期：1
• 页码：74-79
• 全文大小：279KB
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• 作者单位：Kamil Wichterle (1)
  Marek Ve?e? (1)
  Marek C. R??i?ka (2)
  
  1. Department of Chemistry, VSB-Technical University of Ostrava, 17. listopadu 15, 70833, Ostrava Poruba, Czech Republic
  2. Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 16502, Praha 6 Suchdol, Czech Republic
  
• ISSN：1336-9075

文摘

Two perpendicular projections of rising bubbles were observed in counter-current downstream diverging flow. Evidently, the bubbles did not enter the boundary layer at the channel wall and a plug liquid flow assumption was acceptable in our experimental equipment. This confirmed that the experiment was appropriate for simulation of bubble rises in a quiescent liquid column. Recent data obtained by a high-speed camera permitted recording over a period of 60 s. Image analysis by a tailor-made program provided a time-series of quantities related to the position, size, and shape of bubbles. In addition to determination of the aspect ratio of the equivalent oblate ellipsoid, deviation from this shape was investigated in respect of the difference between the bubble’s centre of mass and the geometrical centre of bubble projection. Autocorrelation of the data indicated that the bubble inclination oscillated harmonically with a frequency of 5-0 Hz; cross correlation showed that the horizontal shift of the centre of mass, as well as the horizontal velocity, increased with increasing bubble inclination, and the vertical shift of the centre of mass increased with an increases in the absolute value of the bubble inclination. There is no significant phase shift in the oscillation of these quantities. The bulky bottom side of the bubbles is in accordance with the model of bubble oscillation induced by instability of the equilibrium of gravity and surface tension forces. The oscillation frequency dependence on surface forces (E?tv?s number) is evident, while viscosity does not play a significant role in low-viscosity liquids. Therefore, vortex-shedding is more likely to be an effect of the oscillation and not its cause.