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Dynamiques spéciales de gouttes non-mouillantes

Abstract : This work, based on various experiments, tackles the dynamics of non-wetting drops in situations where gravity does not play a role, but other " special " forces are involved. In the first part, we look at drops of liquid oxygen, which undergo Leidenfrost effect on a substrate at room temperature. These drops are also susceptible to the presence of a magnetic field. We study the force exerted by a magnet on those ultra-mobile drops and we show that they can be deflected, slowed down, deformed, captured and even accelerated by the presence of a magnetic field. In the second part, we study a reverse situation, where the goal is to propel a non-wetting oil drop that is initially at rest. The drop is in a capillary tube and we show that a gradient in surfactant concentration leads to a spontaneous movement and allows the drop to escape from the tube. This experiment can be considered as a model situation of detergency. Non-trivial dynamics has been identified in this system : the movement is either continuous or intermittent, depending on the experimental parameters.
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Submitted on : Thursday, November 24, 2011 - 11:03:37 AM
Last modification on : Wednesday, October 14, 2020 - 3:43:24 AM
Long-term archiving on: : Monday, December 5, 2016 - 2:17:51 AM

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  • HAL Id : pastel-00644333, version 1

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Keyvan Piroird. Dynamiques spéciales de gouttes non-mouillantes. Matière Molle [cond-mat.soft]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00644333⟩

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