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Etude expérimentale du glissement liquide-solide sur surfaces lisses et texturées

Abstract : This work is an experimental study of the hydrodynamic boundary condition of a simple liquid flowing along a solid wall. The three main elements of the original sub-micrometer resolution velocimetry method developed are microfluidic flow control, optical selection of a slice thanks to a wide numerical aperture microscope objective lens, and adaptation of Micro-Particle Image Velocimetry to the setup. The slip length is measured for water on smooth hydrophilic and hydrophobic surfaces. The results lead to a value inferior to 100~nanometers, the experiment's resolution. A possible amplification of the phenomenon by way of a spatial modulation of the hydrodynamic boundary condition is then expounded: micron scale patterns trap gas at the liquid---solid interface, which changes the structure of the flow and induces an effective slip length. The hydrodynamic properties of such surfaces are illustrated through two series of experiments. A volume modification of the velocity field is observed on striped microtextured substrates. A slip length of the order of 500~nanometers is measured on super-hydrophobic micropillar surfaces.
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https://pastel.archives-ouvertes.fr/tel-00011075
Contributor : Pierre Joseph <>
Submitted on : Monday, November 21, 2005 - 7:52:36 PM
Last modification on : Friday, July 17, 2020 - 8:45:52 AM
Long-term archiving on: : Friday, April 2, 2010 - 11:06:57 PM

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  • HAL Id : tel-00011075, version 1

Citation

Pierre Joseph. Etude expérimentale du glissement liquide-solide sur surfaces lisses et texturées. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011075⟩

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