High-speed optical imaging of liquid film flow and liquid macro-slip over free surfaces with different surface energies
Polajnar, Marko (Author), Bizjan, Benjamin (Author), Širok, Brane (Author), 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 (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:f. 557-566
Numbering:Vol. 29, iss. 8
ISSN on article:1557-6833
DOI:10.1002/ls.1388 Link is opened in a new window
COBISS.SI-ID:15511579 Link is opened in a new window
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Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0231

Secondary language

Keywords:hitra kamera, zdrs v tekočinah, površinska energija, površinska napetost, viskoznost

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