non-Newtonian fluidmedical dictionary

<chemistry, physics> A fluid in which the viscosity varies depending upon the shear stress. The effect can arise because of alignment of nonspherical molecules as flow is established or because of suspended deformable particles as in blood.

It relates to a fluid in which flow and rate of shear are not always proportional to the applied stress and which does not obey Poiseuille's law.

See: anomalous viscosity, Fahraeus-Lindqvist effect, Bingham plastic.

Compare: newtonian fluid.

(21 Jun 2000)