20.500.12556/RUL-118601 Dinamika vodnih kapljic na hidrofobnih bakrenih površinah Dynamics of water droplets on hydrophobic copper surfaces V zadnjih letih so hidrofobne in superhidrofobne površine tema številnih raziskav, saj imajo zaradi svojih lastnosti samočiščenja in odbijanja vode potencial za aplikacije na različnih področjih. V okviru zaključne naloge smo analizirali lastnosti bakrene hidrofobne površine in določili izkoristek odboja kapljice na površini ter izvedli velikostno separacijo kapljic na bakreni hidrofobni mrežici. Hidrofobne površine so bile pripravljene z jedkanjem in oblaganjem z raztopino stearinske kisline. Meritve opravljene preko zajema posnetkov s hitrotekočo kamero in strojno obdelavo slik v razvojnem okolju MATLAB kažejo, da je izkoristek odboja kapljic odvisen od njihove vpadne hitrosti in lahko pri dovolj nizkih hitrostih celo presega 50 %. Dokazali smo tudi, da je predstavljen postopek hidrofobizacije primeren za modifikacijo bakrenih mrežic za uporabo v postopku velikostne separacije vodnih kapljic. In recent years, hydrophobic and superhydrophobic surfaces have been the subject of several studies, as they have the potential for applications in various fields due to their self-cleaning and water repelling properties. In this work, we analyzed the properties of the etched copper hydrophobic surfaces, determined the efficiency of droplet rebound and executed the size separation of droplets on a copper hydrophobic mesh. Hydrophobic surfaces were fabricated by etching and coating the surfaces with a solution of stearic acid. The measurements were taken by capturing images with a high-speed camera and processed in the MATLAB computing environment. We discovered that the rebound efficiency depends on the velocity at which the droplet falls on the surface and on the surface fabrication process. Droplet rebound efficiency can even exceed 50 % in cases of low impact speed. We showed that proposed hydrophobization process can be used to modify copper meshes in order to develop drop size separation devices. hidrofobnost odboj kapljic ločevanje kapljic bakrene površine hitrotekoča kamera hydrophobicity drop rebound drop size separation copper surfaces high-speed camera true false false [S. Jereb] Slovenski jezik Angleški jezik Zaključna naloga 2020-08-28 08:30:45 2020-08-28 08:30:49 2022-08-30 04:04:41 0000-00-00 00:00:00 2020 0 Ljubljana 0 XIV, 35 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.6:544.722.3:669.3(043.2) 222716 27604739 5615.pdf 5615.pdf 1 9173D2A7FD4B673C0C1C60C094A2B779 7693afbb8ec4aadf4d3ebe75ded73537e2bfb088d8dade83e9ec529a454b3b1d 89616612-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132980 Fakulteta za strojništvo 0 0 0