nonnewtonian fluid

non·new·to·ni·an flu·id

a fluid in which flow and rate of shear are not always proportional to the applied stress; does not obey Poiseuille law. As in anomalous viscosity; Fahraeus-Lindqvist effect; Bingham plastic. Compare: newtonian fluid.
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Although a large number of constitutive equations have been developed to describe the behaviour of nonNewtonian fluids, the most frequently used model in non-Newtonian fluid mechanics and heat transfer is the Ostwald-de Waele type power-law model [12].