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Infra rdeča termografska analiza zmrzovanja vodne kapljice
Bokal, Urban (Author), Golobič, Iztok (Mentor) More about this mentor... This link opens in a new window, Zupančič, Matevž (Co-mentor)

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Abstract
V magistrski nalogi obravnavamo proces zmrzovanja vodne kapljice na površinah z različno stopnjo omočenja, katerega smo spremljali s pomočjo IR kamere in hitrotekoče kamere. Ovrednoten je tudi pojav superhidrofobnosti, pregled možnih postopkov za izdelavo superhidrofobnih površin na aluminijasti podlagi ter zasnovo površin, kjer kontaktni kot med vodno kapljico in površino znaša več kot 150°. Pri tem smo zasnovali površino, kjer je maksimalni kontaktni kot znašal 161,1° ter kot odkotalitve kapljice ni presegel 1°. Zasnovali in izdelali smo testno progo in testno komoro, ki je omogočila ohladitev aluminijaste površine pod temperaturo zmrzišča vodne kapljice. V delu je ovrednoten še proces ohlajanja in zmrzovanja vodne kapljice na hidrofilni in superhidrofobni površini pri treh temperaturnih nivojih in sicer -6 °C, -9 °C in -12 °C. Pri tem smo ugotovili, da je čas ohlajanja oziroma zmrzovanja na superhidrofobni površini v povprečju daljši za 60% oziroma 58% v primerjavi s hidrofilno površino. Prikazan pa je tudi proces zmrzovanja manjše in večje vodne kapljice pri hitrosti zajema slik 200 Hz s pomočjo IR kamere kjer smo odkrili, da proces rekalescence traja 74,9 ms.

Language:Slovenian
Keywords:hidrofilnost, superhidrofobnost, kontaktni kot kapljice, kot odkotalitve kapljice, ohlajanje vodne kapljice, sreženje, zmrzovanje vodne kapljic
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2021
Publisher:[U. Bokal]
Number of pages:XXVIII, 107 str.
UDC:544.722.3:681.786:621.56(043.2)
COBISS.SI-ID:69979139 This link opens in a new window
Views:177
Downloads:55
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Secondary language

Language:English
Title:Infra red thermographic investigation of water droplet freezing
Abstract:
In the master's thesis we discuss the process of freezing water droplets on surfaces with different degree of wetting, which was monitored using an IR camera and a high-speed camera. The work also deals with the phenomenon of superhydrophobicity, an overview of possible procedures for the fabrication of superhydrophobic surfaces on an aluminium base and the design of surfaces where the contact angle between the water droplet and the surface is more than 150°. We designed a surface where the maximum contact angle was 161,1° and the roll off angle did not exceed 1°. We designed and manufactured a test track and a test chamber that allowed the aluminium surface to cool below the freezing temperature of the water droplet. The work also evaluates the process of cooling and freezing a water droplet on a hydrophilic and superhydrophobic surface at three temperature levels -6 °C, -9 °C and -12 °C. We found that the cooling or freezing time on a superhydrophobic surface is on average 60% or 58% longer compared to the hydrophilic surface. The process of freezing small and large water droplets, which was recorded with the help of an IR camera at a speed of 200 Hz, is also shown, where we found that the recalescence lasts 74,9 ms.

Keywords:contact angle of the droplet, freezing of water droplets, frosting, hydrophilicity, superhydrophobicity, roll off angle of droplet, water droplet cooling

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