Thick films coating a plate withdrawn from a bath

Details Thick films coating a plate withdrawn from a bath Thick films coating a plate withdrawn from a bath

2008-03-27

arxiv.org/abs/0803.3950v1

Physics

Fluid Dynamics

4pages, 5 figures

Scientific paper

We consider the deposition of a film of viscous liquid on a flat plate being withdrawn from a bath, experimentally and theoretically. For any plate speed $U$, there is a range of ``thick'' film solutions whose thickness scales like $U^{1/2}$ for small $U$. These solutions are realized for a partially wetting liquid, while for a perfectly wetting liquid the classical Landau-Levich-Derjaguin (LLD) film is observed, whose thickness scales like $U^{2/3}$. The thick film is distinguished from the LLD film by a dip in its spatial profile at the transition to the bath. We calculate the phase diagram for the existence of stationary film solutions as well as the film profiles, and find excellent agreement with experiment.

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