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The effects of gravity on the capillary instability in tubes

Published online by Cambridge University Press:  24 May 2006

VIRGINIE DUCLAUX ,
CHRISTOPHE CLANET  and
DAVID QUÉRÉ
VIRGINIE DUCLAUX
Affiliation:
IRPHE, UMR 6594, 49 rue F. Joliot-Curie, BP 146, 13384 Marseille, France
CHRISTOPHE CLANET
Affiliation:
IRPHE, UMR 6594, 49 rue F. Joliot-Curie, BP 146, 13384 Marseille, France
DAVID QUÉRÉ
Affiliation:
Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS, Collége de France, 75231 Paris Cedex 05, France
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Abstract

We study the capillary instability of a liquid film (thickness $h_0$) coating a horizontal cylindrical tube (radius $R_0$). We show experimentally that the instability only occurs if $h_0/R_0>0.3(R_0/a)^2$, where $a$ is the capillary length. If this criterion is not fulfilled, the liquid film does not destabilize into an array of drops, owing to the gravitational drainage.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 556 , 10 June 2006 , pp. 217 - 226
Copyright
© 2006 Cambridge University Press

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