20.500.12556/RUL-176467 Vpliv viskoznosti in površinske napetosti kapljice na njeno širjenje ob trku s trdno površino Effect of droplet viscosity and surface tension on its spreading during impact with a solid surface Naloga obravnava proces trka kapljice s trdno površino. Gre za pojav prisoten v številnih naravnih in industrijskih procesih, kot so hlajenje z brizganjem kapljevine, brizgalno tiskanje in škropljenje v kmetijstvu. Osredotočili smo se na vpliv (i) hitrosti in premera kapljice, (ii) lastnosti kapljevine, predvsem viskoznosti in površinske napetosti, ter (iii) na vpliv lastnosti površine. Pripravili smo površine z različno omočljivostjo in na njih izvedli serijo eksperimentov s trki kapljic različnih kapljevin. Analizirali smo širjenje kapljice ob trku in določili maksimalni faktor širjenja, pri čemer smo ugotovili, da ima poleg hitrosti trka pomemben vpliv tudi viskoznost kapljevine. Poleg tega smo analizirali tudi razpad kapljice in popisali njen razpad na superhidrofobni površini med fazo krčenja. Dobljeni rezultati lahko pripomorejo k boljšemu razumevanju obnašanja kapljic na trdnih površinah. The thesis investigates the process of a droplet impact on a solid surface. This phenomenon occurs in numerous natural and industrial processes, such as spray cooling, inkjet printing, and agricultural spraying. The study focuses on the influence of (i) droplet diameter and velocity, (ii) the liquid’s properties, particularly viscosity and surface tension, and (iii) the characteristics of the surface. Surfaces with different wettability were prepared, and a series of experiments were conducted on them with droplets of different liquids impacting the surface at different droplet velocities. Analysis of the droplet spreading dynamics upon impact revealed that, in addition to impact velocity, viscosity plays a key role in determining the maximum spreading factor. Furthermore, droplet breakup was analyzed, and an equation was derived to describe its breakup on a superhydrophobic surface during the retraction phase. The obtained results can contribute to a better understanding of the behavior of droplets on solid surfaces. trk kapljice kot omočenja razpad kapljice širjenje kapljice hidrofobne površine viskoznost površinska napetost droplet impact contact angle droplet breakup droplet spreading hydrohobic surfaces viscosity surface tension true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-12-02 08:30:46 2025-12-02 08:30:53 2025-12-21 04:09:28 0000-00-00 00:00:00 2025 0 0 XX, 67 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.722.132:532.64(043.2) 280036 261809155 46377.pdf 46377.pdf 1 824809AB432056677D783D809DA19641 48e8faf25a949d94bed3b7340b6a76edbc21dd4f0e99c8216c8ed6450a7d57da 73c6b339-cf50-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222805 Fakulteta za strojništvo 0 0 0