20.500.12556/DKUM-71129 Razvoj numeričnega modela za simulacijo toka in prenosa toplote v nanotekočinah Development of a numerical model for heat transfer flow simulation in nanofluids V magistrski nalogi je predstavljena simulacija toka nanotekočine v ogrevani okrogli cevi. Simulacijo smo izvedli s programom ANSYS CFX. Programu smo dodali dodatno parcialno diferencialno enačbo, v kateri so upoštevane lokalne spremembe masnega deleža zaradi Brownovega gibanja in termodifuzije. Predstavljeni so rezultati simulacije za različne obratovalne režime (masni pretok, moč gretja, povprečni masni delež nanodelcev). Rezultate smo primerjali tudi za različne vstopne profile masnega deleža nanodelcev, pri čemer smo upoštevali vpliv sedimentacije delcev. Glede na prikazane rezultate smo ugotovili, da sedimentacija vpliva na intenzivnost naravne konvekcije, kar neposredno vpliva na temperaturo ogrevane cevi. In this master thesis we simulated flow of nanofluids in heated circular pipe. The simulations were carried in ANSYS CFX, where we also added an additional a partial differential equation to account for local mass fraction fluctuation from Brownian motion and thermodiffusion. Presented are results of the simulation for different working regimes (mass flux, heat power, average mass fraction of nanoparticles). We also compared results for different inlet profiles for mass fraction of nanoparticles, with which we accounted sedimentation of particles. According to presented results we have found out, that sedimentation considerably effects the intensity of natural convection, which indirectly affects wall temperature of the heated pipe. nanotekočina nanodelci računalniška dinamika tekočin večfazni tok prenos toplote Brownovo gibanje termodifuzija sedimentacija ANSYS CFX naravna konvekcija prisilna konvekcija nanofluid nanoparticle fluid dynamics multiphase flow heat transfer Brownian motion thermodiffusion sedimentation ANSYS CFX natural convection forced convection true true false [T. Tibaut] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2018-07-18 21:34:40 2018-08-30 12:58:29 2022-08-01 20:24:30 2019-07-11 18:31:21 2018 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 519.876.5:532.5(043.2) 22187030 URN:SI:UM:DK:T8RSE86C MAG_Tibaut_Tilen_2018.pdf MAG_Tibaut_Tilen_2018.pdf 1 80EA2EC5C48761D316DBCC41B4ECE040 d2a1def17038ac64b7edee02aadf46d02e68ce53e3cd2b3285b1a036198507a9 39f1ca92-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/7bb04925-4dac-435e-927e-73a250015289 https://dk.um.si/Dokument.php?lang=slv&id=128209 Fakulteta za strojništvo 0 0 0