Modelling of the overall volumetric mass transfer coefficient measured by the dynamic method in gas-liquid-liquid systems

dc.contributor.authorGakingo, G.K.en
dc.contributor.authorLouw, T.M.en
dc.contributor.authorClarke, K.G.en
dc.date.accessioned2017-09-19T12:48:16Z
dc.date.available2017-09-19T12:48:16Z
dc.date.issued2017en
dc.descriptionPapers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .en
dc.description.abstractLiquid-liquid emulsions encountered in aerobic bioprocesses consist of an immiscible dispersed oil phase that that acts as a solute gas vector or the bioprocess substrate. Mass transfer of solute gases into such systems has been a topic of continual research. It has been established that the oil phase is responsible for the higher solubility of the solute gas, but its presence also affects the overall volumetric mass transfer coefficient. Enhanced, depressed and constant values of the latter have been reported in literature, and such varied behaviour has long posed a difficulty in its modelling. However, recent studies on the equivalent absorption concept have illustrated that varied behaviour of the overall volumetric mass transfer coefficient can be linked to how changes in the emulsion’s solubility are accounted for in the formulations describing the system. These findings suggest that current reports in literature can be reconciled by reviewing how different formulations account for the emulsion’s solubility. This study re-examines formulations used to study mass transfer by the frequently employed dynamic method. The overall volumetric mass transfer coefficient, as measured by this method, is modelled in terms of modified enhancement factor models. These models are able to simulate enhanced, depressed and constant values of the overall volumetric mass transfer coefficient. Furthermore, the models are validated against two experimental case studies that considered oxygen absorption into perfluorocarbon/water and n-alkanes/water emulsions. It is concluded that these models can be used in future empirical and predictive studies on mass transfer by the dynamic method in gas-liquid-liquid and gas-liquid-liquid solid systems.en
dc.description.sponsorshipInternational centre for heat and mass transfer.en
dc.description.sponsorshipAmerican society of thermal and fluids engineers.en
dc.format.extent5 pagesen
dc.format.mediumPDFen
dc.identifier.urihttp://hdl.handle.net/2263/62315
dc.language.isoenen
dc.publisherHEFATen
dc.rightsUniversity of Pretoriaen
dc.subjectGas-liquid-liquiden
dc.subjectOverall volumetric mass transfer coefficienten
dc.subjectEquivalent absorption concepten
dc.subjectDynamic methoden
dc.titleModelling of the overall volumetric mass transfer coefficient measured by the dynamic method in gas-liquid-liquid systemsen
dc.typePresentationen

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