Question

Statement 1: Starch is _____ as its viscosity decreases with an increase in shear stress.

Statement 2: Bingham plastics follow Newton’s law of viscosity at low shears.

(a) Bingham, False

(b) Dilatant, True

(c) Pseudo plastic, False

(d) Newtonian fluid, True

I had been asked this question in my homework.

Enquiry is from Unit Operations in portion Food Processing Techniques, Fluid Mechanics and Rheology of Foods of Food Engineering

Answer 1

Correct answer is (c) Pseudo plastic, False

The explanation is: Starch is Pseudo plastic as its viscosity decreases with an increase in shear stress. Bingham plastics follow Newton’s law of viscosity at high shears. At low shears, they’ve infinite viscosity.