Newtonian fluid

• A Newtonian fluid is one whose viscosity is independent of the ratio of the shear stress and the shear rate.
• Thus, the Flow curve/ Rheogram of a Newtonian fluid is a straight line that passes through the origin.
• Additionally, the Deviatoric Stresses in a Newtonian flow are zero.

$${\tau }_{xx}={\tau }_{yy}={\tau }_{zz}=0$$

---

References

1. Chapter 1 Non-Newtonian Fluid behaviour