20.500.12556/RUL-106780 High-speed optical imaging of liquid film flow and liquid macro-slip over free surfaces with different surface energies 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. high-speed optical imaging liquid slip surface energy surface tension viscosity hitra kamera zdrs v tekočinah površinska energija površinska napetost viskoznost true false false Angleški jezik Slovenski jezik Članek v reviji 2019-03-18 08:51:32 2019-03-18 08:51:34 2025-03-18 09:58:21 0000-00-00 00:00:00 2017 0 0 f. 557-566 iss. 8 Vol. 29 Dec. 2017 0000-00-00 PreprintVObjavi Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2018-12-31 532(045) 1557-6833 10.1002/ls.1388 15511579 RAZ_Polajnar_Marko_i2017.pdf RAZ_Polajnar_Marko_i2017.pdf 1 A0DF2ABA8A41FC6868E6C01072B33A42 1136894e21d83e5e6bebc0e571795c2d715d1ee5dad6f7e847ce996c7a49cbb7 5e6fa32f-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=117530 http://onlinelibrary.wiley.com/doi/10.1002/ls.1388/pdf 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=117529 Fakulteta za strojništvo 0 0 0