Abstract
This chapter begins by introducing basic concepts and basic theories, such as shearing strain, shear rate, and Newton equation, then describes the measurements of viscosity, including the capillary flow method of dilute colloidal systems and the concentric rotational cylinder method of concentrated dispersion systems, and derives the equations for these two methods respectively. For dilute colloidal solutions, the effects of some factors, including spherical particle, particle morphology, and particle salvation, on the viscosity of colloidal solutions are discussed. The measurement method of the molecular weight of the flocculants used in water treatment is introduced. For concentrated dispersion systems, four kinds of non-Newtonian fluids, including plastic fluid, pseudoplastic fluid, dilatant fluid, and thixotropic fluid, are discussed. Ultimately, the rheology properties are connected with the sludge produced in water treatment, and it is demonstrated that rheology properties are very important indications and predictions for sludge conditioning and dewatering.
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