As discussed in Section 2.4, Newtonian fluids are those which follow Newton's law, Eq. (3.5-1):

Equation 3.5-1

where μ is the viscosity and is a constant independent of shear rate. In Fig. 3.5-1 a plot is shown of shear stress τ versus shear rate −dv/dr. The line for a Newtonian fluid is straight, the slope being μ.

If a fluid does not follow Eq. (3.5-1), it is a non-Newtonian fluid. Then a plot of ...

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