High-speed optical imaging of liquid film flow and liquid macro-slip over free surfaces with different surface energies
ID Polajnar, Marko (Author), ID Bizjan, Benjamin (Author), ID Širok, Brane (Author), ID Kalin, Mitjan (Author)

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High-speed optical imaging is introduced as a visualization method to investigate the film-flow properties of liquids with different surface tensions and viscosities (water, poly-alpha-olefin oil, and glycerol) over free rotating surfaces with different surface energies and polarities (steel, and two different diamond-like-carbon - DLC coatings, i.e. DLC, and F-DLC). It was found that the polar surface energy strongly influences the structural dynamics of the liquid film's flow and the film's slip. Namely, a decrease in the polar surface energy results in a less stable filmwith de-wetting areas and breakups into streams, as well as in a larger amount of film slip, which was most clearly expressed by the F-DLC. It was also found that the combination of a high surface tension and a low viscosity provides the largest amount of liquid slip, with the most obvious breakup of the liquid film being observed with water, which clearly exhibits these properties.

Keywords:high-speed optical imaging, liquid slip, surface energy, surface tension, viscosity
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Submitted Version
Number of pages:f. 557-566
Numbering:Vol. 29, iss. 8
PID:20.500.12556/RUL-106780 This link opens in a new window
ISSN on article:1557-6833
DOI:10.1002/ls.1388 This link opens in a new window
COBISS.SI-ID:15511579 This link opens in a new window
Publication date in RUL:18.03.2019
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Keywords:hitra kamera, zdrs v tekočinah, površinska energija, površinska napetost, viskoznost


Funder:ARRS - Slovenian Research Agency
Project number:P2-0231

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