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Swirling water bells

Published online by Cambridge University Press:  19 April 2006

Fritz H. Bark ,
Hans-Peter Wallin ,
Marcus G. Gällstedt  and
L. Peter Kristiansson
Fritz H. Bark
Affiliation:
Department of Mechanics, Royal Institute of Technology, Stockholm, Sweden
Hans-Peter Wallin
Affiliation:
Department of Mechanics, Royal Institute of Technology, Stockholm, Sweden
Marcus G. Gällstedt
Affiliation:
Department of Hydromechanics, Royal Institute of Technology, Stockholm, Sweden
L. Peter Kristiansson
Affiliation:
Department of Mechanics, Royal Institute of Technology, Stockholm, Sweden
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Abstract

Swirling water bells are studied theoretically and experimentally. It is shown theoretically that, if the effects of gravity and the surrounding air are neglected, the shape of a swirling water bell will, under certain circumstances, be periodic along the axis of rotation. Under ideal conditions, a swirling water bell may thus be infinitely long. However, the experiments show that in reality the length of a swirling water bell will be limited owing to Kelvin-Helmholtz instabilities. Theoretically calculated shapes of swirling water bells are found to agree reasonably well with experimental results.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 90 , Issue 4 , 27 February 1979 , pp. 625 - 639
Copyright
© 1979 Cambridge University Press

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