zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program
Aleks Humar (Author), Iztok Golobič (Mentor), Matic Može (Co-mentor)

Abstract

V diplomski nalogi smo z IR kamero opazovali proces zmrzovanja kapljic treh različnih volumnov (1 µl, 10 µl in 50 µl) na hidrofobni in referenčni površini. S spreminjanjem električnega toka smo spreminjali moč hlajenja Peltierjevega elementa in s tem hitrost ohlajanja površine oz. zmrzovanja vodne kapljice. Ugotovili smo, da je v povprečju čas ohlajanja kapljic na hidrofobni površini 85 s, na referenčni pa 52 s, kar je 38 % daljše ohlajanje na hidrofobni površini. Celoten proces zmrzovanja poteka na hidrofobni površini v povprečju 26 % dlje glede na referenčno. Volumen kapljic prav tako vpliva na čas zmrzovanja, saj večje kapljice potrebujejo več časa za zamrznitev. V povprečju je bil proces zmrzovanja pri 10-µl kapljicah 356 % in pri 50-µl kapljicah 1077 % daljši glede na 1-µl kapljico. Z IR kamero smo tudi pri 200 Hz posneli proces rekalescence 10-µl kapljice.

Keywords

diplomske naloge;hidrofobnost;kot močenja;ohlajanje vodne kapljice;zmrzovanje vodne kapljice;IR kamera;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [A. Humar]
UDC: 544.722.3:531.7(043.2)
COBISS: 122329859 Link will open in a new window
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Downloads: 7
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Other data

Secondary language: English
Secondary title: Analysis of water droplet freezing on a superhydrohobicsurface
Secondary abstract: In the thesis, we used an IR camera to observe the freezing process of droplets of three different volumes, 1 μl, 10 μl and 50 μl, on a hydrophobic and a reference surface. By varying the electric current, we varied the cooling power of the Peltier element and thus the rate at which the surface cooled or the water droplet froze. We found that on average the droplet cooling time on the hydrophobic surface is 85 s and on the reference surface 52 s, which is 38% longer cooling on the hydrophobic surface and the whole freezing process takes on average 26% longer on the hydrophobic surface compared to the reference surface. The volume of the droplets also affects the freezing time, as larger droplets take longer to freeze. On average, the freezing process was 356% longer for 10 μl droplets and 1077% longer for 50 μl droplets compared to 1 μl droplet. The IR camera was also used at 200 Hz to record the recalescence of a 10 μl droplet.
Secondary keywords: thesis;hydrophobicity;contact angle;cooling the water droplet;freezing water droplets;IR camera;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XV, 61 f.
ID: 16391503
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