Function in non-Newtonian Liquids

In Newtonian liquids the shear stress x [Pa] is proportional to the shear rate [s 1] 

In non-Newtonian liquids p actually depends on the effective shear rate y and occasionally on its history as well. Such liquids are subdivided accordingly to their flow behavior into three classes  

1 The viscosity does not depend upon the duration of the shear 

3 The liquid partly behaves like a solid body 

These interrelations are recorded in the rheological constitutive equations. 

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