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 got this question by my college director while I was bunking the class.

This interesting question is from Measuring Equipment and Technique in chapter Rheology of Dairy Engineering

Answer 1

The correct choice is (c) Newtonian fluid

To explain I would say: The  n=1 for Newtonian fluids. Newtonian fluid is a fluid in which the viscous stresses arising from its flow, at every point. The stress is linearly proportional to the local strain rate—the rate of change of its deformation over time.