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Characterization of agitation environments in 250 ml spinner vessel, 3 L,and 20 L reactor vessels used for animal cell microcarrier culture
Authors:Raghavan V Venkat  Jeffrey J Chalmers
Institution:(1) Department of Chemical Engineering, The Ohio State University, 43210-1180 Columbus, OH, USA
Abstract:Three dimensional particle tracking velocimetry (3-D PTV) was used to characterize the flow fields in the impeller region of three microcarrier reactor vessels. Three typical cell culture bioreactors were chosen: 250 ml small-scale spinner vessels, 3 L bench-scale reactor, and 20 L medium-scale reactor. Conditions studied correspond to the actual operating conditions in industrial setting and were determined based on the current scale-up paradigm: the Kolmogorov eddy length criterion. In this paper we present characterization of hydrodynamics on the basis of flow structures produced because of agitation. Flow structures were determined from 3-D mean velocity results obtained using 3-D PTV. Although the impellers used in 3 L and 20 L reactors were almost identical, the flow structures produced in the two reactors differed considerably. Results indicate that near geometric scale up does not necessarily amount to scale-up of flow patterns and indicates that intensity as well as distribution of energy may vary considerably during such a scale-up.
Keywords:3-D PTV  bioreactor agitation  flow structures  scale-up
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