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Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction
Author(s) -
Timmermann Jens,
Hoffmann Marko,
Schlüter Michael
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201600299
Subject(s) - bubble , mass transfer , mixing (physics) , turbulence , mechanics , sherwood number , chemistry , mass transfer coefficient , chemical reaction , planar laser induced fluorescence , thermodynamics , laser induced fluorescence , physics , fluorescence , optics , biochemistry , quantum mechanics , reynolds number , nusselt number
The hydrodynamics of bubbly flows is dominated by bubble‐induced turbulence and bubble‐bubble interactions. Both phenomena influence the gas‐liquid mass transfer as well as the mixing of reactants. If the time scales of mass transfer and mixing are in the same order as the time scales of a parallel‐consecutive reaction, the yield and selectivity will be affected by the local hydrodynamics. An experimental setup is presented that enables the investigation of mass transfer during well‐defined and adjustable bubble collisions. The influence of CO 2 bubble collisions on mass transfer is measured and modeled with a modified Sherwood number correlation. Further visualization of the concentration field in the vicinity of O 2 bubbles by means of laser‐induced fluorescence demonstrates the dependency of mass transfer from a chemical reaction and permits the development of a first model approach.