Ph.D in Physics from the
University Paris 6. 26 October 2004. Title: Inertial
Wetting and Dewetting: Triplons, Vibrated puddles, Shocks waves
Research advisor : Prof. Francoise Brochard-Wyart. Laboratory
Physico-Chimie Curie, Institut Curie, Paris.
PDF
version
(In french): Chapter 1, 2 (1.0 Mo),
Chapter
3
(1.2 Mo), Chapter 4 (1.6 Mo), Chapter 5 (1.3 Mo).
For
a
complete version with links, see the multidisciplinary thesis
server:
TEL / CCSD - CNRS
Summary :
We have studied the statics and the dynamics of a floating triple
line. We have build a triple line tensiometer by measuring the force
exerted by the line when we pull on it. We measure the dispersion
relation associated to the waves propagating along this line
("Triplons" ).
We have then studied water puddle deposited on vibrated solid
substrate (frequency fe).
Above a first threshold in amplitude, we observe the depinning of
the line and the radius of the puddle starts to oscillates. Above
a second threshold, we observe an instability of the contour at
frequency fe/2,
parametrically excited by the variations of the drop radius.
We have finally studied the fast dewetting of a water film
floating on a non miscible liquid substrate, denser and non miscible.
We have measured the dewetting velocity V versus the film thickness e.
When V is larger than the velocity of surface waves, we observe a
cascade of shocks propagating ahead or behind the rim collecting the
water.
Comittee :
Mme Anne Marie Cazabat
(President)
Mme Elisabeth Charlaix (Referee)
Mme Michèle Adler (Referee)
M. Yves Couder
M. Jean-Pierre Hulin
Mme Françoise Brochard-Wyart (Advisor) |
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