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.
2017
2019-03-18 08:51:32
1033
high-speed optical imaging, liquid slip, surface energy, surface tension, viscosity
hitra kamera, zdrs v tekočinah, površinska energija, površinska napetost, viskoznost
dk_c
Marko
Polajnar
70
Benjamin
Bizjan
70
Brane
Širok
70
Mitjan
Kalin
70
UDK
4
532(045)
ISSN pri članku
9
1557-6833
DOI
15
10.1002/ls.1388
COBISS_ID
3
15511579
RAZ_Polajnar_Marko_i2017.pdf
1032559
Predstavitvena datoteka
2019-03-18 08:57:46
0
Izvorni URL
2019-03-18 08:51:42