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Mass transfer in packed columns: The cylinder model
Author(s) -
Bornhütter Klaus,
Mersmann Alfons
Publication year - 1993
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.270160109
Subject(s) - mass transfer , packed bed , cylinder , mass transfer coefficient , structured packing , mechanics , flow (mathematics) , yield (engineering) , materials science , chemistry , thermodynamics , chromatography , mechanical engineering , engineering , composite material , physics
In order to predict mass transfer in packed columns, it is necessary to know the interfacial area. The well‐known and often cited equation (Onda, Kolev, Zech, etc.) do not yield precise values for the mass transfer coefficient β L a e or the interfacial area a e , especially for modern packing elements. A new model will be presented which takes into account the structure of packing (cylinder model) as well as the structure of the liquid hold‐up. This model allows the separation of liquid flow through packings into its main constituents, i.e. rivulets and drops (freely falling). The determination of the structure of liquid flow allows the prediction of effective interfacial areas as well as of volumetric mass transfer coefficients for irrigated large packing elements manufactured from plastics, metals or ceramic. The applicability to novel future packings is one of the advantages of the new model.