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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.
If the viscosity of a fluid is a function of shear stress (or, equivalently, of shear rate), such a fluid is called non-Newtonian fluid. 1  Non-Newtonian fluids can be classified into three general categories: 2  Fluid properties are independent of duration of shear. 3  Fluid properties are dependent on duration of shear.