20.500.12556/RUL-186589 Ferofluidno toplotno stikalo Ferrofluidic thermal switch Upravljanje toplotnega toka je ključni izziv v sodobni elektronski in vesoljski tehniki, kjer prostorske omejitve in visoke gostote toplotnih tokov zahtevajo napredne rešitve. Toplotno stikalo omogoča nadzorovan prenos toplote. V vklopljenem stanju toplota teče od izvora do ponora, v izklopljenem stanju pa je toplotni tok prekinjen. V diplomskem delu smo eksperimentalno analizirali karakteristike ferofluidnega toplotnega stikala (FTS), v katerem prenos toplote poteka prek ferofluidne kapljice z visoko toplotno prevodnostjo. Stikalo se vklopi, ko kapljica vzpostavi toplotno povezavo med izvorom in ponorom toplote, ter izklopi, ko jo prekinemo z umikom kapljice. S parametrično eksperimentalno analizo spreminjanja širine prevodnih trakov in širine reže med trakovoma smo določili optimalne pogoje za dosego največjega preklopnega razmerja. Najvišja izmerjena vrednost 30 potrjuje učinkovitost in zanesljivost obravnavanega koncepta ter nakazuje na velik potencial uporabe FTS v toplotni tehniki. Pri interpretaciji rezultatov je potrebno upoštevati, da so bile meritve izvedene v nadzorovanih laboratorijskih pogojih, ki v realnih aplikacijah praviloma niso dosegljivi, zato bo preklopno razmerje v praksi verjetno nižje od laboratorijsko izmerjenega. Thermal management is a key challenge in modern electronics and aerospace engineering, where spatial constraints and high heat flux densities demand advanced solutions. A thermal switch enables controlled heat transfer. In the ON state, heat flows from the source to the sink, while in the OFF state the heat flux is interrupted. In this thesis, we experimentally analysed the characteristics of a ferrofluid thermal switch (FTS), in which heat transfer occurs through a ferrofluid droplet with high thermal conductivity. The switch is turned ON when the droplet establishes a thermal connection between the heat source and the heat sink and turned OFF by withdrawing the droplet. Through a parametric experimental analysis of the conductive track width and the gap width between the tracks, we determined the optimal conditions for achieving the maximum switching ratio. The highest measured value of 30 confirms the efficiency and reliability of the proposed concept and indicates a significant potential for the application of FTS in thermal engineering. When interpreting the results, it should be noted that the measurements were conducted under controlled laboratory conditions, which are generally not achievable in real-world applications; therefore, the switching ratio obtained in practice will likely be lower than that measured in the laboratory. toplotno stikalo toplotni tok toplotna upornost prenos toplote ferofluid thermal switch heat flux thermal resistance heat transfer feroluid true false false [M. Mirnik] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-03 08:37:42 2026-09-03 08:37:47 2026-09-04 04:30:49 0000-00-00 00:00:00 2026 0 Ljubljana 0 XX, 49 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.24:621.316.53(043.2) 289006 289862915 48952.pdf 48952.pdf 1 8556D4DF6D7795E74E7D3A00509D4600 059f865ded50f6e9e71deb63686cbcbd975291c711c877543d256dc29716284c 8b43d42c-a761-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=245865 Fakulteta za strojništvo 0 0 0