20.500.12556/RUL-170100 Optimizacija geometrije mikromešalnika s poševnimi utori z uporabo simulacij računalniške dinamike tekočin Optimization of the Geometry of a Slanted-Groove Micromixer Using Computational Fluid Dynamics Simulations V magistrskem delu je obravnavan problem učinkovitega mešanja tekočin v mikrokanalih, kjer zaradi laminarnega toka ni prisotnega turbulentnega mešanja. Osredotočamo se na pasivni mikromešalnik s poševnimi utori, kjer mešanje poteka predvsem zaradi difuzije in kaotične konvekcije. Cilj raziskave je bil optimizacija geometrije utorov mikromešalnika z namenom izboljšanja mešanja. V ta namen smo izvedli simulacije z metodo računalniške dinamike tekočin v programu Ansys Fluent. Za validacijo numeričnega modela smo uporabili primerjavo s podatki iz literature in nato izvedli eksperimentalno validacijo z izdelanim optimalnim mikromešalnikom s tehnologijo 3D-tiska in vlivanjem PDMS. Analizirali smo več različnih oblik utorov in ugotovili, da geometrija z zaokroženimi robovi omogoča najbolj učinkovito mešanje. Rezultati simulacij so se dobro ujemali z eksperimentalnimi podatki, kjer smo preverili ujemanje tokovnega vzorca, kar potrjuje ustreznost modela. Delo prispeva k izboljšanju načrtovanja pasivnih mikromešalnikov in sorodnih mikrofluidnih naprav. The present master thesis addresses the problem of efficient mixing of fluids in microchannels where no turbulent mixing is present due to laminar flow. The primary focus of this study is a passive micromixer with inclined grooves, wherein the mixing process is predominantly attributed to diffusion and chaotic convection. The objective of the research was to optimise the geometry of the micromixer grooves with a view to enhancing the mixing process. To this end, simulations were conducted utilising the computational fluid dynamics method in Ansys Fluent. In order to validate the numerical model, a comparison with existing literature data was performed, and then experimental validation was conducted using an optimised micromixer fabricated using 3D printing and PDMS casting technology. An analysis of the groove shapes revealed that the geometry with rounded edges allowed for the most efficient mixing. The simulation results demonstrated a high degree of congruence with the experimental data, thereby substantiating the model's validity through the verification of flow pattern matching. This work contributes to the improvement of the design of passive micromixers and related microfluidic devices. mikromešalnik računalniška dinamika tekočin Ansys Fluent optimizacija geometrije 3D-tisk izdelava mikromešalnika PDMS eksperimentalna validacija micromixer computational fluid dynamics Ansys Fluent geometry optimization 3D printing micromixer fabrication PDMS experimental validation true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-07-02 12:58:50 2025-07-02 12:58:51 2025-07-03 11:04:27 0000-00-00 00:00:00 2025 0 0 XXIV, 100 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.646.7:532.5:004.94(043.2) 271156 241242627 39157.pdf 39157.pdf 1 591215342832815BAB8E0B1A7790D427 bbc89e901c232c66e4fa38fe1e8651d1e55b234427c621865f2c4b9c55c17e66 a46b8dad-5731-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212031 Fakulteta za strojništvo 0 0 0