![]() In a Non-Newtonian fluid the relation between the shear stress and the shear rate is different and can even be time-dependent (Time Dependent Viscosity) – a constant coefficient of viscosity cannot be defined for Non-Newtonian fluids as its possible for Newtonian fluids. ![]() The viscosity changes as the force applied changes. Non-Newtonian fluids have viscosities that change according to the amount of force that is applied upon the fluid. In a Newtonian fluid the relation between shear stress and the shear rate is linear, passing through the origin, the constant of proportionality being coefficient of viscosity. The viscosity remains constant as the force applied changes. For Newtonian fluids, changing the force you apply to the fluid will not change their viscosity.
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