Abstract
The interaction of the liquid with ultra-hydrophobic surfaces was so far studied through estimation of static contact angles. It appears now that this interaction is more complex, and cannot be described only with static methods. Effect of ultra-hydrophobic surfaces and their advantages are also particularly in dynamic interaction with liquids. One of the parameters that determine the character of the dynamic interaction is presence of air film close to the surface. The thickness of air film can be measured with long distance microscopy and the interaction with the flow using micro PIV method. Here we present the results of measurements of the air film that is created close to ultra-hydrophobic surfaces and the dependence of its thickness on the Re number.
Highlights
The effect of the surface roughness on the skin friction is well known
The interaction of the liquid with ultra-hydrophobic surfaces was so far studied through estimation of static contact angles
Dynamic interaction of the liquid with UH surface is accompanied by formation of a layer of air film
Summary
The effect of the surface roughness on the skin friction is well known. There are not explored enough interactions between chemically modified surfaces and liquids. Because the development of new surfaces is based on the influence of surface energy using cold plasma technique and applying special chemical structures. In any event, such surfaces macroscopically appear as ultra-hydrophobic (UH) and provide their use in the interaction with liquids, i.e. in hydraulic machines, or a pipe system. Dynamic interaction of the liquid with UH surface is accompanied by formation of a layer of air film. The parameters and the quality of the air film are dependent on the quality and uniformity of UH surface and its roughness, which results from the basic characteristics of skin friction. There has been compiled methodology and principles based on micro PIV and long distance microscopy methods as part of this project
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