Apparent Viscosity - Definition

Definition

In non-Newtonian fluids, the shear stress due to viscosity, is modeled by

where

  • k is the consistency index
  • n is the flow behavior index
  • du/dy is the shear rate, with velocity u and position y

To ensure that has the same sign as du/dy, this is often written as

where the term

is defined as the apparent viscosity.

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