Discussion
Among the shear stress versus shear strain rate curves shown in the figure, which one corresponds to a shear thinning fluid?
Answer: C
The shear thinning fluid is R.
A shear thinning (pseudoplastic) fluid has an apparent viscosity, the slope of the stress-strain rate curve, that falls as the strain rate rises. Its curve starts at the origin and bends downwards, concave to the strain-rate axis, as R does.
Q is a straight line through the origin, a Newtonian fluid with constant viscosity. P starts at the origin and steepens, so its apparent viscosity rises: a shear thickening (dilatant) fluid. S is a straight line that starts above the origin, meaning the fluid needs a yield stress before it flows: a Bingham plastic.
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