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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.
Introduction The great majority of most common fluids (liquids and gases) such as water, organic solvents, oils, air, steam, nitrogen or rare gases are Newtonian in wide temperature and pressure ranges. This fact justifies that classical textbooks on Fluid Mechanics are devoted to the study of Newtonian fluid dynamics.