The interaction between fluid flow and ultra-hydrophobic surface in mini channel
1 Department of Physical Measurement, Technical University of Liberec, The Institute for Nanomaterials, Advanced Technology and Innovation, Studentska 1402/2 Liberec 1 461 17, Czech Republic
2 Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlarska 267/2, 61137 Brno, Czech Republic
3 Faculty of mechanical engineering, Brno University of Technology, Technicka 2896/0, Kralovo Pole, 61669, Brno, Czech Republic
* Corresponding author: firstname.lastname@example.org
Published online: 12 May 2017
Interaction of liquid with ultra-hydrophobic surface is accompanied by creation of layer of air. The effect of the air film has a potential of use in industry in many applications. The quality of the surface is influenced by matrix roughness, the character of physical or chemical cover. There was developed a method for analysis of the liquid flow and the air film using the lighting in volume, visualization with CCD camera and long distance microscope, and optical filters. There were prepared four stainless steel samples of inner channel of dimensions (80 × 8 × 8) mm and initial surface roughness Ra 0.33, Ra 1.0, Ra 2.0, and Ra 2.2. The inner channel was treated with plasma and commercial hydrophobic coating Greblon (WEILBURGER Coatings GmbH). There was realized study focused on the liquid flow velocity profile close to the air film. There are present results for laminar, transient and turbulent flows. The study also estimated the air film thickness depending on the Re number. The knowledge of the air film behaviour helps applied suitable degree of processing and cover for the target application.
© The Authors, published by EDP Sciences, 2017
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