Question

Which of the following satisfy n<1 (where n is flow behavior index)?

(a) Pseudoplastic fluid

(b) Thixotropic fluid

(c) Newtonian fluid

(d) Diliant fluid

I had been asked this question in a national level competition.

This intriguing question originated from Measuring Equipment and Technique topic in division Rheology of Dairy Engineering

Answer 1

Right answer is (a) Pseudoplastic fluid

Easiest explanation: The n<1 for shear thinning (pseudoplastic) fluids. Shear thinning is the non-Newtonian behavior of fluids whose viscosity decreases under shear strain. It is sometimes considered synonymous for pseudo plastic behavior.