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| Paper IPM / P / 7204 |
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| Abstract: | |||||
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The dynamics of the deformations of a moving contact line is
studied assuming two different dissipation mechanisms. It is shown
that the characteristic relaxation time for a deformation of
wavelength 2πl |k| of a contact line moving with
velocity v is given as
ι−1(k)=c(v)|k|. The velocity
dependence of c(v)=c(0)−2v for the case
when the dynamics is governed by microscopic jumps of single
molecules at the tip (Blake mechanism), and
c(v)=c(0)−4v when viscous hydrodynamic
losses inside the moving liquid wedge dominate (de Gennes
mechanism). We also suggest a phase diagram for a moving contact
line on a disordered substrate and show that the onset of leaving
a Landau-Levich film formally corresponds to a roughening
transition of the (receding) contact line.
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