The flow behavior index, denoted as 'n', is a dimensionless parameter used in rheology to characterize the flow behavior of non-Newtonian fluids. It indicates how the viscosity of a fluid changes with shear rate, providing insight into whether a fluid exhibits shear-thinning (pseudoplastic) or shear-thickening behavior. A flow behavior index of less than one suggests that the fluid becomes less viscous when subjected to higher shear rates, while an index greater than one indicates increased viscosity under the same conditions.
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