magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Miha Jelenčič (Author), Rok Petkovšek (Mentor), Jaka Mur (Co-mentor)

Abstract

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.

Keywords

magistrske naloge;nanomehurčki;laser;podtlačni val;kolimiran laserski snop;voda;hitra kamera;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [M. Jelenčič]
UDC: 530.192:66.088(043.2)
COBISS: 120039427 Link will open in a new window
Views: 267
Downloads: 76
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Other data

Secondary language: English
Secondary title: Measurement and analysis of laser generated nanobubbles in water
Secondary abstract: 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.
Secondary keywords: master thesis;nanobubbles;rarefaction wave;collimated laser beam;water;high-speed camera;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXII, 50 str.
ID: 16336528
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