Zasnova in razvoj eksperimentalnega sistema za opazovanje kavitacije vzorca, izoliranega od okoliškega zraka

Ortar, Jernej (author), Bizjan, Benjamin (mentor)

V času, ko se človeška populacija vztrajno povečuje, potrebe po energiji naraščajo ter okoljski pritiski večajo, je ključnega pomena, da je vsa uporabljena tehnologija trajnostno naravnana. Hidrodinamična kavitacija v tem kontekstu izkazuje velik potencial na področju čiščenja odpadnih vod, saj je njena uporaba cenovno ugodnejša, energijsko manj potratna ter okolju prijaznejša od dosedanjih metod čiščenja. Razvoj tehnologije, ki vključuje delovanje hidrodinamične kavitacije, prinaša mnoge izzive, saj so njeni učinki, ki omogočajo čiščenje odplak, zaenkrat še slabo raziskani. Z namenom ugotavljanja vpliva dodajanja salicilne kisline vodi na potek hidrodinamične kavitacije smo v magistrski nalogi zasnovali in izdelali eksperimentalno postajo, ki omogoča preučevanje hidrodinamične kavitacije tekočinskega vzorca, izoliranega od okoliškega zraka. V procesu izdelave naloge smo s hitro kamero posneli kavitiranje treh različnih vzorcev vode in njej dodane salicilne kisline pri koncentracijah 0, 50 ter 300 mg/l. Ob tem smo pomerili ter analizirali tudi tlačna nihanja v območju pojavljanja kavitacijskih struktur pri vseh vzorcih. Dobljene rezultate smo primerjali z referenčno študijo, za katero so bili izvedeni podobni poskusi, vendar na drugačni kavitacijski postaji.

• Language: Slovenian
• Keywords: hidrodinamična kavitacija, vizualizacija toka tekočin, Venturijeva zožitev, tlačna nihanja, salicilna kislina, zrakotesnost
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Ortar]
• Year: 2021
• Number of pages: XXVI, 56 str.
• PID: 20.500.12556/RUL-124512
• UDC: 532.528:661.744.5:628.3(043.2)
• COBISS.SI-ID: 51475715
• Publication date in RUL: 28.01.2021

Secondary language

• Language: English
• Title: Design and development of experimental setup for studying cavitation on a sample insulated from surrounding air

Abstract

In times of steadily population growth, energy demand and environmental problems are increasing, thus it is crucial that all technologies used are sustainable. Regarding that, hydrodynamic cavitation shows great potential in the field of wastewater treatment, as its use is more cost-effective, less energy-intensive and more environmentally friendly than conventional treatment methods. The development of technologies involving favourable effects of hydrodynamic cavitation brings many challenges, since its mechanisms, which enable water treatment, are still poorly understood. In order to determine the effect on the appearance of hydrodynamic cavitation, by adding salicylic acid to water, we designed and manufactured an experimental rig, which enables the study of hydrodynamic cavitation of a liquid sample isolated from the surrounding air. Cavitaiton of three different samples of salicylic acid added to water in concentrations 0, 50 and 300 mg/l were filmed with a fastcam. In addition, we also measured and analyzed pressure fluctuations in the region of cavitation structure appearance, for each sample separately. The obtained results were compared with a reference study were similar experiments were performed in a different type of cavitation station.

• Keywords: hydrodynamic cavitation, fluid flow vizualisation, Venturi constriction, pressure fluctuations, salicylic acid, airtightness