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“School of Physic”

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Paper   IPM / Physic / 7204
School of Physics
  Title:   Dynamics of A Moving Contact Line
  Author(s): 
1.  R. Golestanian
2.  E. Raphael
  Status:   In Proceedings
  Proceeding: Proceedings of the ECS'2001, (4th European Coating Symposium Advances in Coating Process)October 1-4, 2001, Brussles, Belgium
  Year:  2001
  Supported by:  IPM
  Abstract:
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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