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Directional specific shear‐rate measurements in gas‐liquid two‐phase flow
Author(s) -
Pauli Judith,
Menzel Thomas,
Onken Ulfert
Publication year - 1989
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.270120153
Subject(s) - airlift , distributor , mechanics , volumetric flow rate , shear (geology) , bubble , shear rate , spiral (railway) , materials science , liquid bubble , flow (mathematics) , shear stress , chemistry , chromatography , thermodynamics , bioreactor , rheology , composite material , engineering , mechanical engineering , physics , organic chemistry
Wall shear rate vectors in a bubble column and an airlift‐loop reactor were measured using the limiting‐current electrodiffusion technique. In connection with a new circular three‐segment probe, the magnitudes and directions of shear rates were determined. The results for the bubble column are in good agreement with hot film‐anemometry measurements in the same column. Moreover, the spiral flow structure, postulated in the shear‐zone model of Franz, has been confirmed. In addition, the measuring technique was used to determine the flow structure in an airlift‐loop reactor employed for the cultivation of animal cells. The region above the gas distributor of this fermenter has been identified as critical for mechanical damage to the cells.