The interaction between fluid flow and ultra-hydrophobic surface in mini channel
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences
Abstract
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 x 8 x 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.
Description
Subject(s)
hydrophobic surface, PIV, surface roughness
Citation
ISSN
21016275