Analiza dinamične omočljivosti premaza iz polidimetilsiloksana in hidrofobizirane silike = Wickability analysis of the polydimethylsiloxane-silica coating
Avguštinčič, Mitja ...
Boiling heat transfer phenomena strongly relates with interactions between the working fluid and the heated surface. Static contact angle has already demonstrated to affect the heat transfer ...coefficient and critical heat flux during the nucleate pool boiling. However, boiling is highly dynamic process and the contact angle alone is not an adequate measure of wickability. This article presents the development of wickability measurement system that is based on tracking the volume of water being drawn from a capillary tube and into the surface. A high-speed camera records the surface level with 1000 fps and a spatial resolution of 15.7 %m per pixel. Measurements were performed on steel samples, coated with polydimethylsiloxane-silica coating. The coated samples were first annealed at temperatures between 500 °C and 850 °C to achieve variety of static contact angles (between 129.8 ° and <1 °) while the same surface topography and porosity was kept constant. The highest wicked volume flux (7 mm s.-1) was measured on super-hydrophilic surface. By increasing the static contact angle, the wicked volume flux decreased and reached 0 mm s-1 for a surface with a static contact angle of 78 °. The presented method is useful for characterization of the wickability of hydrophilic surfaces. Unlike the static contact angle, the wicked volume flux covers the effects of micro and nanostructures, shape, permeability, and porosity of the surface. All of these parameters play an important role in phase-change heat transfer.
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