The image above represents viscosity of newtonian fluids.

To compute for viscosity of newtonian fluids, two essential parameters are needed and these parameters are **Shear** **Stress (ζ)** and **Shear Rate (γ).**

The formula for calculating viscosity of newtonian fluids:

η = ^{ζ} / _{γ}

Where:

η = Viscosity of Newtonian Fluids

ζ = Shear Stress

γ = Shear Rate

Let’s solve an example;

Find the viscosity of newtonian fluids when the shear stress is 15 and the shear rate is 5.

This implies that;

ζ = Shear Stress = 15

γ = Shear Rate = 5

η = ^{ζ} / _{γ}

η = ^{15} / _{5}

η = 3

Therefore, the **viscosity of newtonian fluids **is **3.**

**Calculating for Shear Stress when the Newtonian Fluids and the Shear Rate is Given.**

ζ = η x γ

Where;

ζ = Shear Stress

η = Viscosity of Newtonian Fluids

γ = Shear Rate

Let’s solve an example;

Find the shear stress when the newtonian fluids is 20 and the shear rate is 4.

This implies that;

η = Viscosity of Newtonian Fluids = 20

γ = Shear Rate = 4

ζ = η x γ

ζ = 20 x 4

ζ = 80

Therefore, the **shear stress **is **80.**

Continue reading How to Calculate and Solve for Viscosity of Newtonian Fluids | Rheology