High-speed optical imaging of liquid film flow and liquid macro-slip over free surfaces with different surface energies

Polajnar, Marko (avtor), Bizjan, Benjamin (avtor), Širok, Brane (avtor), Kalin, Mitjan (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: high-speed optical imaging, liquid slip, surface energy, surface tension, viscosity
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Nerecenzirani rokopis
• Leto izida: 2017
• Št. strani: f. 557-566
• Številčenje: Vol. 29, iss. 8
• PID: 20.500.12556/RUL-106780
• UDK: 532(045)
• ISSN pri članku: 1557-6833
• DOI: 10.1002/ls.1388
• COBISS.SI-ID: 15511579
• Datum objave v RUL: 18.03.2019

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: hitra kamera, zdrs v tekočinah, površinska energija, površinska napetost, viskoznost

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija