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On the periodic nature of the drag on a rising bubble

โœ Scribed by J.T. Lindt

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
559 KB
Volume
27
Category
Article
ISSN
0009-2509

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โœฆ Synopsis

Ahstraet-An effect of a regular periodic component of the drag on a rising spheroidal bubble in water (1800 < Re, < 6200) has been experimentally proven. Two frequency modes of the rotational drag component have been found: for 1800 < Reb < 2700 the Strouhal number SI, is a steep function of Reb; whereas for 2700 < Reb < 6200& is only weakly influenced by Reb. The vortex structure visualized, containing a fragment of a helical vortex, is associated with the periodicity of both the modes. The stability of the helical vortex is dependent on Reb. A similarity between the formation mechanism of a vortex street and a helical vortex wake is suggested.

๐Ÿ“œ SIMILAR VOLUMES

The drag on a single bubble accompanied
The drag on a single bubble accompanied by a periodic wake
โœ J.T. Lindt; R.G.F. De Groot ๐Ÿ“‚ Article ๐Ÿ“… 1974 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 877 KB

The dynamics of a single spheroidal bubble accompanied by an open periodic wake were studied in water-glycerol solutions (1 < r) < 37 cP) by photographic techniques. The stability of the helical vortex, the frequency of the bubble rocking and the drag coefficient were found to be closely related. Th