20.500.12556/DKUM-99413 Modeliranje hladilnika za prekinitev reakcije s hitrim hlajenjem diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje Modeling of a cooler for reaction quenching by rapid cooling V diplomskem delu obravnavamo modeliranje hladilnika za hitro prekinitev kemijske reakcije s hlajenjem (angl. quench) v pretočnem mikroreaktorskem sistemu. Namen dela je bil zasnovati geometrijo hladilnika in z uporabo računalniške dinamike tekočin (CFD) ovrednotiti prenos toplote ter določiti vpliv izbranih obratovalnih pogojev na učinkovitost hlajenja reakcijske zmesi. Tridimenzionalni geometrijski model hladilnika, sestavljen iz vstopnega kanala, razširjenega osrednjega dela in izstopnega kanala, smo izdelali v programu PTC Creo Parametric. Numerične simulacije smo izvedli v programu SimScale, pri čemer smo analizirali vpliv temperature stene hladilnika in hitrosti toka reakcijske zmesi na temperaturno in hitrostno polje. Kot kriterij za uspešno prekinitev reakcije smo določili znižanje temperature reakcijske zmesi z začetnih 190 °C pod mejno temperaturo 140 °C. Rezultati CFD simulacij so pokazali, da je bila mejna temperatura dosežena pri vseh analiziranih obratovalnih pogojih. Nižja temperatura stene je omogočila nekoliko hitrejše ohlajanje reakcijske zmesi, vendar je bil njen vpliv v obravnavanem temperaturnem območju razmeroma majhen. Bistveno večji vpliv je imela hitrost toka. Z njenim zmanjševanjem se je zaradi daljšega zadrževalnega časa izrazito zmanjšala razdalja, potrebna za doseganje mejne temperature. Analiza hitrostnega polja je pokazala tudi, da razširjeni osrednji del hladilnika povzroči zmanjšanje hitrosti toka in s tem izboljša pogoje za prenos toplote. Na podlagi rezultatov smo ugotovili, da predlagana geometrija hladilnika je v okviru uporabljenega CFD modela omogočala učinkovito znižanje temperature reakcijske zmesi pod izbrano mejno vrednost. Rezultati hkrati kažejo, da ima pri obravnavanih pogojih hitrost toka večji vpliv na učinkovitost hitrega hlajenja kot temperatura stene hladilnika. In this bachelor’s thesis, we investigate the modelling of a cooler for the rapid termination of a chemical reaction by cooling (quenching) in a continuous flow microreactor system. The aim of the work was to design the geometry of the cooler and using computational fluid dynamics (CFD), evaluate heat transfer and determine the influence of selected operating conditions on the cooling efficiency of the reaction mixture. A three-dimensional geometric model of the cooler, consisting of an inlet channel, an expanded central section and an outlet channel, was created in PTC Creo Parametric. Numerical simulations were performed in SimScale, where the effects of the cooler wall temperature and the flow velocity of the reaction mixture on the temperature and velocity fields were analysed. A decrease in the temperature of the reaction mixture from the initial 190 °C to below the threshold temperature of 140 °C was defined as the criterion for successful reaction quenching. The CFD simulation results showed that the threshold temperature was reached under all analysed operating conditions. A lower wall temperature enabled slightly faster cooling of the reaction mixture; however, its influence within the investigated temperature range was relatively small. Flow velocity had a greater effect. As the flow velocity decreased, the distance required to reach the threshold temperature was significantly reduced due to the longer residence time. Analysis of the velocity field also showed that the expanded central section of the cooler reduces flow velocity, thereby improving the conditions for heat transfer. Based on the results, we conclude that, within the applied CFD model, the proposed cooler geometry effectively reduces the reaction mixture temperature below the selected threshold value. The results also indicate that, under the investigated conditions, flow velocity has a greater influence on the efficiency of rapid cooling than cooler wall temperature. mikroreaktorji računalniška dinamika tekočin simulacija prenos toplote takojšnja zaustavitev reakcije microreactors computational fluid dynamics heat transfer quenching true true false [U. Zakšek] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-08-16 12:48:05 2026-09-04 13:55:00 2026-09-19 03:06:12 0000-00-00 00:00:00 2026 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (VIII, 31 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.045.5.011(043.2) 291601923 VS_Zaksek_Ursa_2026.pdf VS_Zaksek_Ursa_2026.pdf 1 A11862A7F93498A028DDB006F3341A0B 6d0c9d6fc58a1f9028f8d1abf7a738eee1adaa7e668a2397d280c9db60732004 57284d93-a69d-11f1-aef5-00155d0001be https://dk.um.si/Dokument.php?lang=slv&id=211258 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0