NDLI: Hydrodynamics in external-loop airlift bioreactors with static mixers

Content Provider	Springer Nature Link
Author	Gavrilescu, M. Roman, R. V. Tudose, R. Z.
Copyright Year	1997
Abstract	Liquid circulation superficial velocity and gas holdup behaviours were investigated in an external-loop airlift bioreactor of 0.170 m3 liquid volume in gas-induced and forced-circulation-loop operation modes, in the presence of static mixers made of corrugated stainless steel pieces, resulting in packets with the height-to-diameter ratio equal to unity and using non-Newtonian starch solutions as liquid phase. The static mixers were disposed in the riser in three blocks, each with three mixing packets, successively turned 90° to the adjacent mixing element. It was found that in the presence of static mixers and forced-loop operation mode, liquid circulation superficial velocity in the riser section was significantly diminished, while gas holdup increased in a great measure. It was considered that static mixers split the fluid into individual streams and break up the bubbles, resulting in small bubble sizes with a relative homogeneous bubble distribution over riser cross section. They act as supplementary resistances in liquid flow, reducing riser cross sectional area, equivalent with A D /A R area ratio diminishing.
Starting Page	93
Ending Page	99
Page Count	7
File Format	PDF
ISSN	0178515X
Journal	Bioprocess Engineering
Volume Number	16
Issue Number	2
e-ISSN	16157605
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Applied Microbiology and Biotechnology Biotechnology

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