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Erschienen in:
2012 | OriginalPaper | Buchkapitel
Rheology of Sheared Bacterial Suspensions
verfasst von : Zhenlu Cui, Xiao-Ming Zeng
Erschienen in: Natural Locomotion in Fluids and on Surfaces
Verlag: Springer New York
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Abstract
A continuum hydrodynamic model for flowing active liquid crystals has been used to characterize active particle systems such as bacterial suspensions. The behavior of such systems subjected to a weak steady shear is analyzed. We explore the steady states and perform their stability analysis. We predict the rheology of active systems including an activity thickening or thinning behavior of the apparent viscosity and a negative apparent viscosity depending on the particle type, flow alignment and the anchoring conditions, which can be tested on bacterial suspensions. We find remarkable dualities which show that flow-aligning rodlike pullers (pushers) particles are dynamically and rheologically equivalent to flow-aligning discoid pushers (pullers) particles for both tangential and homeotropic anchoring conditions.
76A15, 82D30, 92C05.