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Transient response of a solid‐liquid model biological fluidised bed to a step change in fluid superficial velocity
Author(s) -
Poncelet Denis,
Naveau Henry,
Nyns EdmondJacques,
Dochain Denis
Publication year - 1990
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280480406
Subject(s) - porosity , discontinuity (linguistics) , transient (computer programming) , mechanics , materials science , superficial velocity , critical ionization velocity , geology , composite material , flow (mathematics) , physics , mathematics , mathematical analysis , computer science , operating system
The evolution of a solid‐liquid model biological fluidised bed under a step change in fluid superficial velocity is described. During a transient step change, the fluidised bed divides into a top zone which remains at the initial porosity and a bottom zone which settles at the final porosity. The interface of discontinuity in porosity moves progressively upwards through the fluidised bed. The velocity at which the top of the fluidised bed expands or contracts and the upward velocity of the porosity transition interface depend only upon the initial and final states of the bed porosity and the fluid superficial velocity. This results in a linear evolution with time of the total bed height and the height of porosity transition interface. The proposed model is well suited to describe the transient response of low‐density particles in a fluidised bed, such as encountered in biological systems, to a sudden change of liquid superficial velocity. The model was validated experimentally.

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