Explanation
The ratio of shear stress to shear rate is not constant for a fluid whose viscosity changes with shear rate. non-Newtonian fluid can be classified as Bingham plastic fluid, pstaidoplastic fluid, dilatant fluid, thixotropic fluid and rheopectic flow according to the change of viscosity with shear rate or the change of shear stress with time under constant shear rate. macromolecule melts and solutions are generally non-Newtonian fluid, and their flow behaviors show both viscous and elasticity responses. The common non Newtonian behaviors of macromolecule fluids include shear thinning, pole climbing phenomenon (Weissenberg effect), pore pressure error, extrusion swell, etc.
Classification
No classification at present.