Garcia, ValdemarSobrinho Teixeira, João Alberto2013-03-252013-03-252012Garcia, Valdemar; Sobrinho Teixeira, João (2012). Mass transfer models for oxygen-water co-current flow in vertical bubble columns. In Dias, Ricardo [et al.] Single and Two-Phase Flows on Chemical and Biomedical Engineering. Bentham Science Publishers. p. 386-411. ISBN 978-1-60805-504-3978-1-60805-504-3http://hdl.handle.net/10198/8288The present work reports a theoretical and experimental study of mass transfer for oxygen-water co-current flow in vertical bubble columns. The axial dispersion of liquid phase was also studied. Experiments were carried out in a 32 mm internal diameter and 5.35 and 5.37 m height columns. The superficial liquid velocity ranged from 0.3 to 0.8 m/s and volumetric flow rate ratio of gas to liquid ranged from 0.015 to 0.25. Mathematical models were developed to predict concentration of gas dissolved in the liquid as function of different physical and dynamic variables for two-phase cocurrent downflow and upflow. We obtained for the ratio of the liquid side mass transfer coefficient to initial bubbles radius, kL/r0=0.12 s-1.engVertical bubble columnsGas-liquid bubble flowOxygen-water flowOxygen-water mass transferMass transfer modelsGas-liquid co-current downflowGas-liquid co-current upflowMass transfer coefficientAxial dispersionLiquid axial dispersion coefficientU tubebook part