Fluorescenčna termografija za merjenje nestacionarnega temperaturnega polja pri trku kapljice s podhlajeno površino

Dečko, Van (author), Može, Matic (mentor), Golobič, Iztok (comentor)

V magistrskem delu obravnavamo analizo trka kapljice s podhlajeno površino z uporabo fluorescenčne termografije. V ta namen smo razvili temperaturno občutljive nanose na osnovi rutenijevega barvila v polimerni matrici, ki smo jih nanesli na aluminijaste substrate. Izvedli smo kalibracijo temperaturnega odziva nanosov in fotodegradacijske teste ter razvite nanose uporabili za opazovanje temperaturnega polja na površini med trkom kapljic različnih hitrosti s površino temperature med -15 °C in -35 °C. Preko zaznane temperaturno-odvisne intenzitete fluorescence nanosov smo določili temperaturna polja s časovno resolucijo 2000 Hz in ovrednotili vpliv temperature površine in hitrosti kapljice na nestacionarna temperaturna polja na površini. Z meritvami smo potrdili, da je merilna metoda ustrezna za določanje fizikalnih značilnosti trka in zmrzovanja kapljice na podhlajeni površini, z visoko časovno in krajevno ločljivostjo.

• Language: Slovenian
• Keywords: fluorescenčna termografija, temperaturno občutljivi nanosi, podhlajena površina, trk kapljice, temperaturno polje, zmrzovanje kapljice
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [V. Dečko]
• Year: 2026
• Number of pages: XXIV, 84 str.
• PID: 20.500.12556/RUL-187479
• UDC: 543.57:532.6:544.722.3(043.2)
• COBISS.SI-ID: 291600387
• Publication date in RUL: 11.09.2026

Secondary language

• Language: English
• Title: Fluorescence thermography for transient temperature field measurement during droplet impact onto a subcooled surface

Abstract

This master's thesis investigates droplet impact on a subcooled surface using fluorescence thermography. For this purpose, temperature-sensitive coatings based on a ruthenium dye embedded in a polymer matrix were developed and applied to aluminium substrates. The temperature response of the coatings was calibrated, photodegradation tests were conducted, and the developed coatings were used to observe the surface temperature field during the impact of droplets at different velocities on surfaces with temperatures ranging from -15 °C and -35 °C. Using the temperature-dependent fluorescence intensity of the coatings, temperature fields were determined at a temporal resolution of 2000 Hz, and the effects of surface temperature and droplet velocity on the transient surface temperature fields were evaluated. The measurements confirmed that the method is suitable for determining the physical characteristics of droplet impact and freezing on a subcooled surface with high temporal and spatial resolution.

• Keywords: fluorescence thermography, temperature sensitive paint, subcooled surface, droplet impact, temperature field, droplet freezing