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Hydrodynamics and mass transfer of an airlift reactor with inserted membrane

dc.contributor.advisorPetrović, Dragan
dc.contributor.advisorPopović, Svetlana
dc.contributor.otherOmorjan, Radovan
dc.contributor.otherPetrović, Dragan
dc.contributor.otherPopović, Svetlana
dc.contributor.otherVeljković, Vlada
dc.contributor.otherJokić, Aleksandar
dc.creatorKojić, Predrag
dc.date.accessioned2016-05-28T14:50:30Z
dc.date.available2016-05-28T14:50:30Z
dc.date.available2020-07-03T13:54:57Z
dc.date.issued2016-05-20
dc.identifier.urihttp://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija145769535516482.pdf?controlNumber=(BISIS)100280&fileName=145769535516482.pdf&id=5064&source=NaRDuS&language=srsr
dc.identifier.urihttp://nardus.mpn.gov.rs/handle/123456789/5435
dc.identifier.urihttp://www.cris.uns.ac.rs/record.jsf?recordId=100280&source=NaRDuS&language=srsr
dc.identifier.urihttp://www.cris.uns.ac.rs/DownloadFileServlet/IzvestajKomisije145769543086280.pdf?controlNumber=(BISIS)100280&fileName=145769543086280.pdf&id=5065&source=NaRDuS&language=srsr
dc.description.abstractU okviru doktorske disertacije izvedena su eksperimentalna istraživanja osnovnih hidrodinamičkih i maseno-prenosnih karakteristika airlift reaktora sa spoljnom recirkulacijom sa ugrađenom višekanalnom cevnom membranom u silaznu cev (ALSRM). ALSRM je radio na dva načina rada: bez mehurova u silaznoj cevi (način rada A) i sa mehurovima u silaznoj cevi (način rada B) u zavisnosti od nivoa tečnosti u gasnom separatoru. Ispitivani su uticaji prividne brzine gasa, površinskih osobina tečne faze, tipa distributora gasa i prisustva mehurova gasa u silaznoj cevi na sadržaj gasa, brzinu tečnosti u silaznoj cevi i zapreminski koeficijent prenosa mase u tečnoj fazi u ALSRM. Rezultati su poređeni sa vrednostima dobijenim u istom reaktoru ali bez membrane (ALSR). Sadržaj gasa u uzlaznoj i silaznoj cevi određivan je pomoću piezometarskih cevi merenjem hidrostatičkog pritiska na dnu i vrhu uzlazne i silazne cevi. Brzina tečnosti merena je pomoću konduktometrijskih elektroda dok je zapreminski koeficijent prenosa mase dobijen primenom dinamičke metode merenjem promene koncentracije kiseonika u vremenu optičkom elektrodom. Eksperimentalni rezultati pokazuju da sadržaj gasa, brzina tečnosti i zapreminski koeficijent prenosa mase zavise od prividne brzine gasa, vrste alkohola i tipa distributora gasa kod oba reaktora. Višekanalna cevna membrana u silaznoj cevi uzrokovala je povećanje ukupnog koeficijenta trenja za 90% i time dovela do smanjenja brzine tečnosti u silaznoj cevi do 50%. Smanjena brzina tečnosti u silaznoj cevi povećala je sadržaj gasa do 16%. Predložene neuronske mreže i empirijske korelacije odlično predviđaju vrednosti za sadržaj gasa, brzinu tečnosti i zapreminski koeficijent prenosa mase.sr
dc.description.abstractAn objective of this study was to investigate the hydrodynamics and the gas-liquid mass transfer coefficient of an external-loop airlift membrane reactor (ELAMR). The ELAMR was operated in two modes: without (mode A), and with bubbles in the downcomer (mode B), depending on the liquid level in the gas separator. The influence of superficial gas velocity, gas distributor’s geometry and various diluted alcohol solutions on hydrodynamics and gas-liquid mass transfer coefficient of the ELAMR was studied. Results are commented with respect to the external loop airlift reactor of the same geometry but without membrane in the downcomer (ELAR). The gas holdup values in the riser and the downcomer were obtained by measuring the pressures at the bottom and the top of the riser and downcomer using piezometric tubes. The liquid velocity in the downcomer was determined by the tracer response method by two conductivity probes in the downcomer. The volumetric mass transfer coefficient was obtained by using the dynamic oxygenation method by dissolved oxygen probe. According to experimental results gas holdup, liquid velocity and gas-liquid mass transfer coefficient depend on superficial gas velocity, type of alcohol solution and gas distributor for both reactors. Due to the presence of the multichannel membrane in the downcomer, the overall hydrodynamic resistance increased up to 90%, the liquid velocity in the downcomer decreased up to 50%, while the gas holdup in the riser of the ELAMR increased maximally by 16%. The values of the gas holdup, the liquid velocity and the gas-liquid mass transfer coefficient predicted by the application of empirical power law correlations and feed forward back propagation neural network (ANN) are in very good agreement with experimental values.en
dc.languagesr (latin script)
dc.publisherУниверзитет у Новом Саду, Технолошки факултетsr
dc.rightsopenAccessen
dc.sourceУниверзитет у Новом Садуsr
dc.subjectAirlift reaktorisr
dc.subjectairliften
dc.subjectmembranasr
dc.subjectrazblaženi rastvori alkoholasr
dc.subjectuvodnik gasasr
dc.subjectsadržaj gasasr
dc.subjectbrzina tečnostisr
dc.subjectzapreminski koeficijent prenosa masesr
dc.subjectneuronska mrežasr
dc.subjectmembraneen
dc.subjectdilute alcohol solutionsen
dc.subjectgas distributoren
dc.subjectgas holdupen
dc.subjectliquid velocityen
dc.subjectgas-liquid mass transfer coefficienten
dc.subjectartificial neural networken
dc.titleHidrodinamika i prenos mase u airlift reaktoru sa membranomsr
dc.titleHydrodynamics and mass transfer of an airlift reactor with inserted membraneen
dc.typedoctoralThesisen
dc.rights.licenseBY-NC
dcterms.abstractПоповић, Светлана; Петровић, Драган; Јокић, Aлександар; Оморјан, Радован; Петровић, Драган; Поповић, Светлана; Вељковић, Влада; Којић, Предраг; Хидродинамика и пренос масе у аирлифт реактору са мембраном; Хидродинамика и пренос масе у аирлифт реактору са мембраном;
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40461/Disertacija2689.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40460/IzvestajKomisije2689.pdf
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_nardus_5435


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