Vpliv viskoznosti infuziranega silikonskega olja na širjenje in zmrzovanje vodne kapljice ob trku s podhlajeno spolzko površino

Bevk, Luka (author), Može, Matic (mentor), Golobič, Iztok (comentor)

Nabiranje ledu in sreža močno zmanjša funkcionalnost številnih površin. V diplomski nalogi je bil obravnavan vpliv viskoznosti infuziranega silikonskega olja na obnašanje vodne kapljice ob trku s podhlajeno spolzko površino. Preizkušene površine so bile izdelane z laserskim strukturiranjem, hidrofobizacijo in infuzijo silikonskih olj različnih viskoznosti. Pri različnih temperaturah površine in Webrovih številih smo analizirali širjenje, krčenje in zmrzovanje vodnih kapljic. Poseben poudarek je bil namenjen maksimalnemu faktorju širjenja kapljice. Rezultati so pokazali, da sta na dinamiko kapljice pomembno vplivajo tako viskoznosti infuziranega olja kot temperatura površine. Z zniževanjem temperature se je spreminjala dinamika širjenja in krčenja kapljice. Različna viskoznost olja je vplivala na interakcijo med kapljico in mazalnim slojem ter posledično na obnašanje kapljice med trkom. Rezultati raziskave tako prispevajo k boljšemu razumevanju vpliva viskoznosti maziva in temperature površine na obnašanje vodne kapljice ob trku s podhlajeno spolzko površino.

• Language: Slovenian
• Keywords: trk kapljice, podhlajena površina, spolzka površina, zmrzovanje, dinamika kapljice, viskoznost olja
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [L. Bevk]
• Year: 2026
• Number of pages: XIII, 55 f.
• PID: 20.500.12556/RUL-186686
• UDC: 621.9.048:544.722.132:532.64(043.2)
• COBISS.SI-ID: 290006275
• Publication date in RUL: 04.09.2026

Secondary language

• Language: English
• Title: Effect of infused silicone oil viscosity on spreading and freezing of a water droplet impacting a subcooled slippery surface

Abstract

Ice and frost accumulation significantly reduce the functionality of many surfaces. This thesis investigated the influence of the viscosity of infused silicone oil on the behaviour of a water droplet impacting a supercooled slippery surface. The tested surfaces were fabricated by laser structuring, hydrophobization, and infusion with silicone oils of different viscosities. Droplet spreading, retraction, and freezing were analysed at different surface temperatures and Weber numbers. Particular emphasis was placed on the maximum spreading factor of the droplet. The results showed that both the viscosity of the infused oil and the surface temperature had a significant influence on droplet dynamics. As the temperature decreased, the spreading and retraction dynamics of the droplet changed. Different lubricant viscosities affected the interaction between the droplet and the lubricant layer and consequently influenced the droplet behaviour during impact. The results of this study therefore contribute to a better understanding of the influence of lubricant viscosity and surface temperature on the behaviour of a water droplet impacting a supercooled slippery surface.

• Keywords: droplet impact, subcooled surface, slippery surface, freezing, droplet dynamics, oil viscosity