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Overall gas–liquid mass transfer from Taylor bubbles flowing upwards in a circular capillary
Author(s) -
Mehdi Shozab,
Billet AnneMarie,
Chughtai Imran R.,
Inayat Mansoor H.
Publication year - 2013
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1738
Subject(s) - shadowgraph , bubble , mass transfer coefficient , mass transfer , capillary action , chemistry , slug flow , mechanics , tube (container) , superficial velocity , thermodynamics , hydraulic diameter , analytical chemistry (journal) , flow (mathematics) , materials science , two phase flow , chromatography , physics , turbulence , composite material , reynolds number
Overall liquid side volumetric mass transfer coefficient k L a was determined experimentally for cocurrent Taylor flow moving upwards in a glass tube of an internal diameter of 3 mm. Experiments were performed for physical absorption of oxygen in 20% aqueous solution of ethanol. Shadowgraph technique was deployed for precise measurements of bubble lengths and velocities. Experimental values of volumetric mass transfer coefficient k L a were evaluated by use of oxygen sensor and contributions of two possible mass transfer mechanisms: bubble to liquid slug and bubble to liquid film were discussed. Effects of various hydrodynamic parameters such as superficial velocity, length of bubble and slug, and so forth on k L a have also been presented. A correlation has been proposed for the estimation of k L a for a wide range of bubble to slug lengths ratio and superficial velocities of gas and liquids. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.
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