A non-Newtonian fluid is a type of fluid whose viscosity changes with the applied shear rate or shear stress, unlike Newtonian fluids, which have a constant viscosity regardless of the applied forces. In simpler terms, the behavior of non-Newtonian fluids can vary depending on how they are being acted upon.
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A non-Newtonian fluid has a stress--strain-rate relation with nonlinear, time-dependent, history-dependent, or microstructure-dependent behavior.