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Non-newtonian fluid. A fluid that departs from the classic linear newtonian relation between stress and shear rate. In a strict sense, a fluid is any state of matter that is not a solid, and a solid is a state of matter that has a unique stress-free state.
One physical quantity important in the rheology of fluids is viscosity. Viscosity is defined as the ratio of shear stress to shear rate in the fluid. A fluid for which viscosity is constant at all shear rates is called a âNewtonianâ fluid.Examples of Newtonian fluids include: water, sugar solutions, glycerin, silicone oils, light-hydrocarbon oils, air and other gases (Schlumberger, 2002). fluid for which viscosity is constant at all shear rates is called a âNewtonianâ fluid. Examples of Newtonian fluids include: water, sugar solutions, glycerin, silicone oils, light-hydrocarbon oils, air and other gases (Schlumberger, 2002).