20.500.12556/RUL-153316 Ovrednotenje nadzorovanega zmrzovanja vodnih kapljic z uporabo hitrotekoče kamere Evaluation of controlled water droplet freezing using high-speed videography Nastajanje ledu povzroča škodo in tako predstavlja izziv na številnih področjih. Za boljše razumevanje mehanizmov nastajanja ledu smo v delu razvili merilno progo, ki nudi vpogled v proces zmrzovanja in omogoča testiranje potencialnih rešitev v obliki funkcionaliziranih površin. Razvita merilna proga omogoča vizualizacijo procesa zmrzovanja z uporabo hitrotekoče kamere. Zaprta komora omogoča nadzorovano zmrzovanje vodnih kapljic različnih volumnov pri različnih površinskih temperaturah v nadzorovani atmosferi. Prikazan je vpliv različne relativne vlažnosti zraka in velikosti kapljice na proces zmrzovanja. Ovrednotena sta ponovljivost izvajanja meritev časa zakasnitve procesa zmrzovanja kapljic volumna 3,7 µL in raztros izmerkov zaradi naključnosti procesa zmrzovanja. Prikazana je protizmrzovalna sposobnost superhidrofobne površine, s katero smo dosegli znatno zakasnitev začetka nastajanja ledu v primerjavi z referenčno površino. Prav tako smo s pomočjo hitrotekoče kamere prikazali potek fronte strjevanja kapljice in proces rekalescence ter potrdili potrebo po uporabi hitrotekoče kamere za celovito ovrednotenje procesa zmrzovanja. Formation of ice causes damage and thus presents a challenge in many areas. In order to better understand the mechanisms of ice formation, we developed an experimental setup in our work, which provides an insight into the freezing process and enables the testing of potential solutions in the form of functionalized surfaces. The developed experimental setup enables visualization of the freezing process using a high-speed camera. The closed chamber enables the controlled freezing of water droplets of different volumes at different surface temperatures in a controlled atmosphere. The influence of different relative air humidities and droplet size on the freezing process is shown. The reproducibility of the measurement of the time delay regarding the freezing process of 3.7 µL droplets and the scatter of the measurements due to the randomness of the freezing process are evaluated. The anti-icing ability of the superhydrophobic surface is shown, with which we achieved a significant delay in the onset of ice formation compared to the reference surface. Furthermore, with the help of a high-speed camera, we demonstrated the progress of the droplet freezing front and the recalescence process and confirmed the need to use a highspeed camera for a comprehensive evaluation of the freezing process. zmrzovanje rekalescenca superhidrofobnost protizmrzovalne površine kot omočenja merilna proga freezing recalescence superhydrophobicity anti-icing surfaces contact angle experimental setup true false false [R. Kelher] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-12-22 07:30:16 2023-12-22 07:30:21 2024-02-19 11:56:49 0000-00-00 00:00:00 2023 0 Ljubljana 0 XX, 65 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.56:544.722.3:53.083(043.2) 259883 185972739 32642.pdf 32642.pdf 1 34DB1CB2F2852EDB23A5693DEF8E11E7 7b818ac6527a6082d2882580f7d28f9867c14b9172167a98d1ec4d249380ab73 94d04f6f-a093-11ee-90ad-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=179246 Fakulteta za strojništvo 0 0 0