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Very, very fast wetting

Published online by Cambridge University Press:  15 April 2002

DAVID JACQMIN
DAVID JACQMIN
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
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Abstract

Just after formation, optical fibres are wetted stably with acrylate at capillary numbers routinely exceeding 1000. It is hypothesized that this is possible because of dissolution of air into the liquid coating. A lubrication/boundary integral analysis that includes gas diffusion and solubility is developed. It is applied using conservatively estimated solubility and diffusivity coefficients and solutions are found that are consistent with industry practice and with the hypothesis. The results also agree with the claim of Deneka, Kar & Mensah (1988) that the use of high-solubility gases to bathe a wetting line allows significantly greater wetting speeds. The solutions indicate a maximum speed of wetting which increases with gas solubility and with reduction in wetting-channel diameter.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 455 , 25 March 2002 , pp. 347 - 358
Copyright
© 2002 Cambridge University Press

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