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Gouttes, Flaques et Arches Sèches: des lignes de contact en présence d'un écoulement

Abstract : Contact lines in interaction with a liquid ow are involved in many industrial or fondamental situations, We study sliding drops rst along their symetry axis (Part 1), and then from a three-dimensional point of vue, measuring the contact angle distribution around this drop (Part 2) and the velocity eld at its surface. We show that the situation is locally two-dimensional in the direction perpendicular to the contact line. The contact angle then only depends on the contact line velocity whom tangential part goes to zero at the contact line. When a corner singularity is observed at the rear of the drop, we show that the velocity eld is self similar. We also address (Part III) the question of static contact lines interacting with a ow, We actually study the shape and stability of dry patches inside a owing lm, We measure the contact angle all around the dry patches and we show that the contact angle distribution is, depending on the dry patch history, either uniform and equal to the advection contact angle, either very scattered. At least, we exhibit a novel stick-slip motion of the contact line when a drop of collodal suspension is advancing (interaction between hydrodynamics and drying).
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Submitted on : Tuesday, September 27, 2005 - 8:00:00 AM
Last modification on : Friday, August 5, 2022 - 11:54:05 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:02:25 PM



  • HAL Id : pastel-00001387, version 1


Rio Emmanuelle. Gouttes, Flaques et Arches Sèches: des lignes de contact en présence d'un écoulement. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨pastel-00001387⟩



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