Experimental Interfacial Reconstruction and Mass Transfer Modelling of a Slug Bubble During Co-current Flow in a Millimetric Tube

Mass transfer during the gas liquid interactions in a monolith reactor has been an area of paramount importance due to its prevalence in process intensification. The present study experimentally investigates the mass transfer from slug bubble train in a glass tube by using the colorimetric method and a high-speed camera. An oxygen sensitive dye resazurin is used with the pure oxygen cap/slug bubble train for the current study. An in-house code has been developed for image thresholding, interface detection, bubble mask generation, and concentration measurement. It is investigated that the overall mass transfer coefficient increases with the gas superficial velocity. The role of the Taylor recirculation vortices in the mass transfer enhancement has been observed from the radial concentration profile.