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Viscosity

Shear Rate

Viscosity

The viscosity of a fluid is a measure of its tendency to resist an internal shearing force.

Viscosity = Shear Stress / Shear Rate

Shear Stress = Force / Area = Mass(M) x Acceleration(Ft/sec/sec) / Ft x Ft

In other words the Shear Stress can be increased or decreased by either changing the velocity of the liquid (acceleration) and/or the pipe size.

Shear Rate = Velocity / Film Thickness = Ft/sec / Ft = 1/Sec (Reciprocal Seconds) 

The rate is a function of the flow and the pipe size measured in reciprocal seconds shown in the following graph.


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