20.500.12556/RUL-187982 Modeliranje kavitacije za oceno nastanka reaktivnih kisikovih zvrsti Cavitation modeling for assessment of the formation of reactive oxygen species Naraščajoča prisotnost težko razgradljivih organskih snovi v odpadnih vodah zahteva učinkovitejše metode čiščenja. Hidrodinamska kavitacija se kaže kot obetaven napredni oksidacijski proces, saj ob kolapsu kavitacijskih mehurčkov nastajajo reaktivne kisikove zvrsti (ROS), ključne za oksidacijo onesnaževal. V okviru raziskave je bil razvit numerični model kavitacije, ki temelji na pristopu RDT z modificiranim SST k-ω modelom turbulence in Schnerr–Sauerjevim modelom kavitacije. Model je bil verificiran z meritvami v Venturijevih mikrokanalih, kjer je bila potrjena Kelvin–Helmholtzeva nestabilnost kot mehanizem trganja kavitacijskih oblakov. Analiza korelacije med nastankom ROS in parametri kavitacije je pokazala, da prostorninski delež in prostornina vodne pare predstavljata najpomembnejša indikatorja kemijske aktivnosti. Znanje je bilo preneseno na rotacijski generator hidrodinamske kavitacije, kjer je bilo potrjeno, da manjši razmak med statorskimi in rotorskimi zobmi povečuje prostorninski delež in prostornino vodne pare, kar kaže na večjo kemijsko aktivnost kavitacije in s tem pričakovani procesni učinek. Razvit model omogoča primerjalno oceno delovanja kavitacijskih naprav ter optimizacijo njihovih geometrijskih in obratovalnih parametrov. The increasing presence of poorly degradable organic compounds in wastewater necessitates more efficient treatment methods. Hydrodynamic cavitation is emerging as a promising advanced oxidation process, as the collapse of cavitation bubbles generates reactive oxygen species (ROS) that are critical for the oxidation of pollutants. In this research, a numerical cavitation model was developed using a CFD approach with a modified SST k-ω turbulence model and the Schnerr–Sauer cavitation model. The model was verified against measurements in Venturi microchannels, where Kelvin–Helmholtz instability was confirmed as a mechanism governing cavitation cloud shedding. Correlation analysis between ROS formation and cavitation parameters demonstrated that the vapor volume fraction and the vapor volume are the most important indicators of chemical activity. The acquired knowledge was then transferred to a rotational hydrodynamic cavitation generator, where it was confirmed that a smaller gap between the stator and rotor teeth increases the vapor volume fraction and vapor volume, thereby indicating a higher chemical activity of cavitation and an increased expected process effect. The developed model enables a comparative assessment of cavitation device performance and the optimization of their geometric and operating parameters. hidrodinamska kavitacija računalniška dinamika tekočin čiščenje odpadnih voda napredni oksidacijski procesi reaktivne kisikove zvrsti hydrodynamic cavitation computational fluid dynamics wastewater treatment advanced oxidation processes reactive oxygen species true false false [P. Pipp] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2026-09-17 08:30:26 2026-09-17 08:30:43 2026-09-21 09:04:31 0000-00-00 00:00:00 2026 0 Ljubljana 0 XXVII, 118 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.5:519.6:628.3(043.3) 290603 291726339 48602.pdf 48602.pdf 1 D4F238E454899F7AA0A5C92C6671BA7B 6ce52778fc8544216cc15f5c3f0c3decb2c9da170a665443ddd1b14a0fe3ec0a 45b85c2c-b261-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247833 Fakulteta za strojništvo 0 0 0