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Computational fluid dynamics (CFD) analysis of airlift bioreactor: effect of draft tube configurations on hydrodynamics, cell suspension, and shear rate

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Title Computational fluid dynamics (CFD) analysis of airlift bioreactor:
effect of draft tube configurations on hydrodynamics, cell
suspension, and shear rate
 
Creator Pawar, Sanjay B.
 
Subject Microbiology
 
Description The biomass productivity of microalgae cells
mainly depends on the hydrodynamics of airlift bioreactor
(ABR). Thus, the hydrodynamics of concentric tube ABR
was initially studied using two-phase three-dimensional
CFD simulations with the Eulerian–Lagrangian approach.
The performance of ABR (17 L) was examined for different
configurations of the draft tube using various drag
models such as Grace, Ishii–Zuber, and Schiller–Naumann.
The gas holdups in the riser and the downcomer were well
predicted using E–L approach. This work was further
extended to study the dispersion of microalgae cells in the
ABR using three-phase CFD simulations. In this model
(combined E–E and E–L), the solid phase (microalgae
cells) was dispersed into the continuous liquid phase (water),
while the gas phase (air bubbles) was modeled as a
particle transport fluid. The effect of non-drag forces such
as virtual mass and lift forces was also considered. Flow
regimes were explained on the basis of the relative gas
holdup distribution in the riser and the downcomer. The
microalgae cells were found in suspension for the superficial
gas velocities of 0.02–0.04 m s-1 experiencing an
average shear of 23.52–44.56 s-1 which is far below the
critical limit of cell damage.
 
Publisher Springer
 
Date 2018
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1228/1/Lohiya%20Ji-2.pdf
Pawar, Sanjay B. (2018) Computational fluid dynamics (CFD) analysis of airlift bioreactor: effect of draft tube configurations on hydrodynamics, cell suspension, and shear rate. Bioprocess and Biosystems Engineering, 41 (1). pp. 31-45. ISSN 1615-7591, ESSN: 1615-7605
 
Relation https://link.springer.com/journal/449
http://neeri.csircentral.net/1228/