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Mass Transfer from Single Taylor Bubbles in Minichannels
Author(s) -
Kastens Sven,
Hosoda Shogo,
Schlüter Michael,
Tomiyama Akio
Publication year - 2015
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.201500065
Subject(s) - bubble , mass transfer , mechanics , sherwood number , hydraulic diameter , square (algebra) , materials science , mass transfer coefficient , flow (mathematics) , dissolution , thermodynamics , chemistry , physics , mathematics , geometry , reynolds number , turbulence , nusselt number
Mass transfer from single CO 2 Taylor bubbles in vertical minichannels was measured for various channel hydraulic diameters D h . The effects of channel geometries on the mass transfer were also investigated by using square ducts and circular pipes. Bubble rising velocities, v B , in the ducts were much faster than those in the pipes due to large liquid flow areas in the corners of the ducts. The values of mass transfer coefficients in the pipes were almost the same as those in the ducts, in spite of a large difference in v B . Sherwood numbers, Sh D , using D h as a characteristic length, are well‐correlated in terms of the Eötvös number. The proposed Sh D correlation can well predict a long‐term dissolution process of a Taylor bubble.