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Rugosité et dynamique d'une ligne de contact sur un substrat désordonné

Abstract : We have studied the roughness and the dynamics of the contact line of a viscous liquid on a disordered substrate. With a controlled disorder of typical scale 10 µm, the roughness of the contact line depends neither on the viscosity nor on the velocity of the line. The roughness exponent zeta is found equal to 0.52±0.04, this value desagrees the theoritical prediction (zeta = 0.39). Thus, we have checked the assumptions of the model. A precise study of the motion of the contact line confirms the assumption of an overdamped motion. On the other hand, the dissipation is not due to the viscosity. A realistic simulation shows that the non linearities of the dissipation forces do not explain the unexpected value of zeta. Both experiment and simulation show that the dynamics close to the depinning threshold is mainly controlled by the dissipation at microscopic scale, that is not universal.
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Contributor : Sébastien Moulinet <>
Submitted on : Tuesday, July 29, 2003 - 10:46:32 AM
Last modification on : Monday, December 14, 2020 - 9:51:14 AM
Long-term archiving on: : Tuesday, September 11, 2012 - 9:15:19 PM


  • HAL Id : tel-00003202, version 1


Sébastien Moulinet. Rugosité et dynamique d'une ligne de contact sur un substrat désordonné. Analyse de données, Statistiques et Probabilités []. Université Paris-Diderot - Paris VII, 2003. Français. ⟨tel-00003202⟩



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