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Lubricated pipelining. Part 3 Stability of core-annular flow in vertical pipes

Published online by Cambridge University Press:  26 April 2006

Kangping Chen ,
Runyuan Bai  and
Daniel D. Joseph
Kangping Chen
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA
Runyuan Bai
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA
Daniel D. Joseph
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA
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Abstract

The stability of core-annular flow in vertical pipes is analysed using the linearized theory of stability. In previous studies instabilities due to interfacial friction, interfacial tension and Reynolds stresses in the bulk fluid were identified and associated with observed instabilities. In this study we include and analyse the effects of gravity. In one case gravity opposes and in the other aids the applied pressure gradient. Some preliminary results from our experiments are also presented. The prediction of stability for perfect core-annular flow in a carefully selected window of parameters is verified for the case of free fall in which the applied pressure gradient vanishes.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 214 , May 1990 , pp. 251 - 286
Copyright
© 1990 Cambridge University Press

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References

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