20.500.12556/RUL-139350 Merjenje in analiza lasersko generiranih nanomehurčkov v vodi Measurement and analysis of laser generated nanobubbles in water Delo predstavlja pojav prosto plavajočih nanomehurčkov. Za generiranje nanomehurčkov je bila izbrana metoda presvetlitve vode s kolimiranim laserskim snopom. Opazovanje je bilo osnovano na uporabi podtlačnega udarnega vala, ki je nanomehurčke razširil do velikosti primerne za opazovanje. Meritve so bile opravljene s pomočjo hitre kamere. Čas, ko so mehurčki vidni je relativno kratek, s trajanjem v območju mikrosekund. V sklopu analize je bil narejen algoritem, ki iz posnetka v eno metriko združi število in velikost nanomehurčkov. Ugotovljeno je bilo, da se ob povečevanju energije pulza presvetlitvenega laserja gostota nanomehurčkov najprej povečuje in nato doseže zasičenje. Prav tako je bilo ugotovljeno, da lahko življenjski čas nanomehurčkov v vodi znaša tudi do več deset sekund. This master's thesis describes a phenomenon involving bulk nanobubbles. A method where a collimated laser beam is shined through the water, was chosen for seeding bulk nanobubbles. The observations were made using a rarefaction wave that expanded nanobubbles to observable sizes. Observations were made with a high-speed camera. Time, when one can observe expanded nanobubbles, is relatively short, ranging to a few microseconds. We devised an algorithm that combines number and size of nanobubbles into a single metric. We discovered that increasing the energy of a collimated laser beam results in an increase of the density of nanobubbles, until it reaches the saturation zone. We also discovered that nanobubbles can survive for tens of seconds in water. nanomehurčki laser podtlačni val kolimiran laserski snop voda hitra kamera nanobubbles laser rarefaction wave collimated laser beam water high-speed camera true false false [M. Jelenčič] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2022-09-01 08:30:59 2022-09-01 08:31:01 2023-11-29 13:40:39 0000-00-00 00:00:00 2022 0 Ljubljana 0 XXII, 50 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 530.192:66.088(043.2) 243915 120039427 17546.pdf 17546.pdf 1 564536280AB01AC57874465929ECB31A af1582e4bdf84966f99f290406a7ec134b6b8730d70dc04d7d60386b558cc428 9cabdd33-29bf-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=159892 Fakulteta za strojništvo 0 0 0