Rheological Properties and Coagulated Structure of Concentrated Microbial Culture Suspension

Abstract

Shear strain amplitude dependence of dynamic viscoelasticity (G′ and η′) and shear rate dependence of steady flow viscosity (η) of concentrated Escherichia coli culture suspension were studied. G′ showed linear behavior at strain amplitude (γ) less than 0.02 but showed large decrement at γ >0.02. η showed pre-shear dependence at high shear rate. These results suggest change in network structure of microbial flock with increase of strain amplitude and increase of shear rate.